!8195 master：data-storage 和window问题修改：window需同步翻译

Merge pull request !8195 from 葛亚芳/master

en/application-dev/reference/apis/js-apis-data-storage.md

@@ -3,7 +3,7 @@
 Lightweight storage provides applications with data processing capability and allows applications to perform lightweight data storage and query. Data is stored in key-value (KV) pairs. Keys are of the string type, and values can be of the number, string, or Boolean type.
 
 
-> **NOTE**<br/>
+> **NOTE**
 >
 > - The initial APIs of this module are supported since API version 6. Newly added APIs will be marked with a superscript to indicate their earliest API version.
 >
@@ -20,10 +20,10 @@ import data_storage from '@ohos.data.storage';
 
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
-| Name| Type| Readable| Writable| Description|
-| -------- | -------- | -------- | -------- | -------- |
-| MAX_KEY_LENGTH | string | Yes| No| Maximum length of a key. It must be less than 80 bytes.|
-| MAX_VALUE_LENGTH | string | Yes| No| Maximum length of a value. It must be less than 8192 bytes.|
+| Name             | Type   | Readable | Writable | Description                                                 |
+| ---------------- | ------ | -------- | -------- | ----------------------------------------------------------- |
+| MAX_KEY_LENGTH   | string | Yes      | No       | Maximum length of a key. It must be less than 80 bytes.     |
+| MAX_VALUE_LENGTH | string | Yes      | No       | Maximum length of a value. It must be less than 8192 bytes. |
 
 
 ## data_storage.getStorageSync
@@ -35,25 +35,33 @@ Reads the specified file and loads its data to the **Storage** instance for data
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | path | string | Yes| Path of the target file.|
+
+| Name | Type   | Mandatory | Description              |
+| ---- | ------ | --------- | ------------------------ |
+| path | string | Yes       | Path of the target file. |
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | [Storage](#storage) | **Storage** instance used for data storage operations.|
 
-**Example**
-  ```js
-  import data_storage from '@ohos.data.storage'
+| Type                | Description                                            |
+| ------------------- | ------------------------------------------------------ |
+| [Storage](#storage) | **Storage** instance used for data storage operations. |
 
-  let path = '/data/storage/el2/database'
-  let storage = data_storage.getStorageSync(path + '/mystore')
-  storage.putSync('startup', 'auto')
-  storage.flushSync()
+**Example**
 
-  ```
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+let storage = data_storage.getStorageSync(path + '/mystore');
+storage.putSync('startup', 'auto');
+storage.flushSync();
+```
 
 
 ## data_storage.getStorage
@@ -65,25 +73,33 @@ Reads the specified file and loads its data to the **Storage** instance for data
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | path | string | Yes| Path of the target file.|
-  | callback | AsyncCallback&lt;[Storage](#storage)&gt; | Yes| Callback used to return the execution result.|
+
+| Name     | Type                                     | Mandatory | Description                                   |
+| -------- | ---------------------------------------- | --------- | --------------------------------------------- |
+| path     | string                                   | Yes       | Path of the target file.                      |
+| callback | AsyncCallback&lt;[Storage](#storage)&gt; | Yes       | Callback used to return the execution result. |
 
 **Example**
-  ```js
-  import data_storage from '@ohos.data.storage'
 
-  let path = '/data/storage/el2/database'
-  data_storage.getStorage(path + '/mystore', function (err, storage) {
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+data_storage.getStorage(path + '/mystore', function (err, storage) {
     if (err) {
-          console.info("Failed to get the storage. Path: " + path + '/mystore')
+        console.info("Failed to get the storage. path: " + path + '/mystore');
         return;
     }
-      storage.putSync('startup', 'auto')
-      storage.flushSync()
-  })
-  ```
+    storage.putSync('startup', 'auto');
+    storage.flushSync();
+})
+```
 
 
 ## data_storage.getStorage
@@ -95,29 +111,37 @@ Reads the specified file and loads its data to the **Storage** instance for data
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | path | string | Yes| Path of the target file.|
+
+| Name | Type   | Mandatory | Description              |
+| ---- | ------ | --------- | ------------------------ |
+| path | string | Yes       | Path of the target file. |
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | Promise&lt;[Storage](#storage)&gt; | Promise used to return the result.|
 
-**Example**
-  ```js
-  import data_storage from '@ohos.data.storage'
+| Type                               | Description                        |
+| ---------------------------------- | ---------------------------------- |
+| Promise&lt;[Storage](#storage)&gt; | Promise used to return the result. |
 
-  let path = '/data/storage/el2/database'
+**Example**
 
-  let getPromise = data_storage.getStorage(path + '/mystore')
-  getPromise.then((storage) => {
-      storage.putSync('startup', 'auto')
-      storage.flushSync()
-  }).catch((err) => {
-      console.info("Failed to get the storage. Path: " + path + '/mystore')
-  })
-  ```
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+let getPromise = data_storage.getStorage(path + '/mystore');
+getPromise.then((storage) => {
+    storage.putSync('startup', 'auto');
+    storage.flushSync();
+}).catch((err) => {
+    console.info("Failed to get the storage. path: " + path + '/mystore');
+})
+```
 
 
 ## data_storage.deleteStorageSync
@@ -129,15 +153,25 @@ Deletes the singleton **Storage** instance of a file from the memory, and delete
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | path | string | Yes| Path of the target file.|
+
+| Name | Type   | Mandatory | Description              |
+| ---- | ------ | --------- | ------------------------ |
+| path | string | Yes       | Path of the target file. |
 
 **Example**
-  ```js
-  let path = '/data/storage/el2/database'
-  data_storage.deleteStorageSync(path + '/mystore')
-  ```
+
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+data_storage.deleteStorageSync(path + '/mystore');
+```
 
 
 ## data_storage.deleteStorage
@@ -149,22 +183,32 @@ Deletes the singleton **Storage** instance of a file from the memory, and delete
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | path | string | Yes| Path of the target file.|
-  | callback | AsyncCallback&lt;void&gt; | Yes| Callback that returns no value.|
+
+| Name     | Type                      | Mandatory | Description                     |
+| -------- | ------------------------- | --------- | ------------------------------- |
+| path     | string                    | Yes       | Path of the target file.        |
+| callback | AsyncCallback&lt;void&gt; | Yes       | Callback that returns no value. |
 
 **Example**
-  ```js
-  let path = '/data/storage/el2/database'
-  data_storage.deleteStorage(path + '/mystore', function (err) {
+
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+data_storage.deleteStorage(path + '/mystore', function (err) {
     if (err) {
-          console.info("Deleted failed with err: " + err)
-          return
+        console.info("Failed to delete the storage with err: " + err);
+        return;
     }
-      console.info("Deleted successfully.")
-  })
-  ```
+    console.info("Succeeded in deleting the storage.");
+})
+```
 
 
 ## data_storage.deleteStorage
@@ -176,25 +220,35 @@ Deletes the singleton **Storage** instance of a file from the memory, and delete
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | path | string | Yes| Path of the target file.|
+
+| Name | Type   | Mandatory | Description              |
+| ---- | ------ | --------- | ------------------------ |
+| path | string | Yes       | Path of the target file. |
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | Promise&lt;void&gt; | Promise that returns no value.|
+| Type                | Description                    |
+| ------------------- | ------------------------------ |
+| Promise&lt;void&gt; | Promise that returns no value. |
 
 **Example**
-  ```js
-  let path = '/data/storage/el2/database'
-  let promisedelSt = data_storage.deleteStorage(path + '/mystore')
-  promisedelSt.then(() => {
-      console.info("Deleted successfully.")
-  }).catch((err) => {
-      console.info("Deleted failed with err: " + err)
-  })
-  ```
+
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+let promisedelSt = data_storage.deleteStorage(path + '/mystore');
+promisedelSt.then(() => {
+    console.info("Succeeded in deleting the storage.");
+}).catch((err) => {
+    console.info("Failed to delete the storage with err: " + err);
+})
+```
 
 
 ## data_storage.removeStorageFromCacheSync
@@ -206,15 +260,25 @@ Removes the singleton **Storage** instance of a file from the cache. The removed
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | path | string | Yes| Path of the target file.|
+
+| Name | Type   | Mandatory | Description              |
+| ---- | ------ | --------- | ------------------------ |
+| path | string | Yes       | Path of the target file. |
 
 **Example**
-  ```js
-  let path = '/data/storage/el2/database'
-  data_storage.removeStorageFromCacheSync(path + '/mystore')
-  ```
+
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+data_storage.removeStorageFromCacheSync(path + '/mystore');
+```
 
 
 ## data_storage.removeStorageFromCache
@@ -226,22 +290,32 @@ Removes the singleton **Storage** instance of a file from the cache. The removed
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | path | string | Yes| Path of the target file.|
-  | callback | AsyncCallback&lt;void&gt; | Yes| Callback that returns no value.|
+
+| Name     | Type                      | Mandatory | Description                     |
+| -------- | ------------------------- | --------- | ------------------------------- |
+| path     | string                    | Yes       | Path of the target file.        |
+| callback | AsyncCallback&lt;void&gt; | Yes       | Callback that returns no value. |
 
 **Example**
-  ```js
-  let path = '/data/storage/el2/database'
-  data_storage.removeStorageFromCache(path + '/mystore', function (err) {
+
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+data_storage.removeStorageFromCache(path + '/mystore', function (err) {
     if (err) {
-          console.info("Removed storage from cache failed with err: " + err)
-          return
+        console.info("Failed to remove storage from cache with err: " + err);
+        return;
     }
-      console.info("Removed storage from cache successfully.")
-  })
-  ```
+    console.info("Succeeded in removing storage from cache.");
+})
+```
 
 
 ## data_storage.removeStorageFromCache
@@ -253,25 +327,36 @@ Removes the singleton **Storage** instance of a file from the cache. The removed
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | path | string | Yes| Path of the target file.|
+
+| Name | Type   | Mandatory | Description              |
+| ---- | ------ | --------- | ------------------------ |
+| path | string | Yes       | Path of the target file. |
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | Promise&lt;void&gt; | Promise that returns no value.|
+
+| Type                | Description                    |
+| ------------------- | ------------------------------ |
+| Promise&lt;void&gt; | Promise that returns no value. |
 
 **Example**
-  ```js
-  let path = '/data/storage/el2/database'
-  let promiserevSt = data_storage.removeStorageFromCache(path + '/mystore')
-  promiserevSt.then(() => {
-      console.info("Removed storage from cache successfully.")
-  }).catch((err) => {
-      console.info("Removed storage from cache failed with err: " + err)
-  })
-  ```
+
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+let promiserevSt = data_storage.removeStorageFromCache(path + '/mystore')
+promiserevSt.then(() => {
+    console.info("Succeeded in removing storage from cache.");
+}).catch((err) => {
+    console.info("Failed to remove storage from cache with err: " + err);
+})
+```
 
 
 ## Storage
@@ -288,21 +373,24 @@ Obtains the value corresponding to a key. If the value is null or not in the def
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | key | string | Yes| Key of the data. It cannot be empty.|
-  | defValue | [ValueType](#valuetype) | Yes| Default value to be returned if the value of the specified key does not exist. It can be a number, string, or Boolean value.|
+
+| Name     | Type                    | Mandatory | Description                                                  |
+| -------- | ----------------------- | --------- | ------------------------------------------------------------ |
+| key      | string                  | Yes       | Key of the data. It cannot be empty.                         |
+| defValue | [ValueType](#valuetype) | Yes       | Default value to be returned if the value of the specified key does not exist. It can be a number, string, or Boolean value. |
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | ValueType | Value corresponding to the specified key. If the value is null or not in the default value format, the default value is returned.|
+
+| Type      | Description                                                  |
+| --------- | ------------------------------------------------------------ |
+| ValueType | Value corresponding to the specified key. If the value is null or not in the default value format, the default value is returned. |
 
 **Example**
-  ```js
-  let value = storage.getSync('startup', 'default')
-  console.info("The value of startup is " + value)
-  ```
+
+```js
+let value = storage.getSync('startup', 'default');
+console.info("The value of startup is " + value);
+```
 
 
 ### get
@@ -314,22 +402,24 @@ Obtains the value corresponding to a key. If the value is null or not in the def
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | key | string | Yes| Key of the data. It cannot be empty.|
-  | defValue | [ValueType](#valuetype) | Yes| Default value to be returned. It can be a number, string, or Boolean value.|
-  | callback | AsyncCallback&lt;ValueType&gt; | Yes| Callback used to return the execution result.|
+
+| Name     | Type                           | Mandatory | Description                                                  |
+| -------- | ------------------------------ | --------- | ------------------------------------------------------------ |
+| key      | string                         | Yes       | Key of the data. It cannot be empty.                         |
+| defValue | [ValueType](#valuetype)        | Yes       | Default value to be returned. It can be a number, string, or Boolean value. |
+| callback | AsyncCallback&lt;ValueType&gt; | Yes       | Callback used to return the execution result.                |
 
 **Example**
-  ```js
-  storage.get('startup', 'default', function(err, value) {
+
+```js
+storage.get('startup', 'default', function(err, value) {
     if (err) {
-          console.info("Get the value of startup failed with err: " + err)
-          return
+        console.info("Failed to get the value of startup with err: " + err);
+        return;
       }
-      console.info("The value of startup is " + value)
-  })
-  ```
+    console.info("The value of startup is " + value);
+})
+```
 
 
 ### get
@@ -342,25 +432,26 @@ Obtains the value corresponding to a key. If the value is null or not in the def
 
 **Parameters**
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| key | string | Yes| Key of the data. It cannot be empty.|
-| defValue | [ValueType](#valuetype) | Yes| Default value to be returned. It can be a number, string, or Boolean value.|
+| Name     | Type                    | Mandatory | Description                                                  |
+| -------- | ----------------------- | --------- | ------------------------------------------------------------ |
+| key      | string                  | Yes       | Key of the data. It cannot be empty.                         |
+| defValue | [ValueType](#valuetype) | Yes       | Default value to be returned. It can be a number, string, or Boolean value. |
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | Promise&lt;ValueType&gt; | Promise used to return the result.|
+
+| Type                     | Description                        |
+| ------------------------ | ---------------------------------- |
+| Promise&lt;ValueType&gt; | Promise used to return the result. |
 
 **Example**
-  ```js
-  let promiseget = storage.get('startup', 'default')
-  promiseget.then((value) => {
+```js
+let promiseget = storage.get('startup', 'default');
+promiseget.then((value) => {
     console.info("The value of startup is " + value)
-  }).catch((err) => {
-      console.info("Get the value of startup failed with err: " + err)
-  })
-  ```
+}).catch((err) => {
+    console.info("Failed to get the value of startup with err: " + err);
+})
+```
 
 
 ### putSync
@@ -372,15 +463,17 @@ Obtains the **Storage** instance corresponding to the specified file, writes dat
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | key | string | Yes| Key of the data. It cannot be empty.|
-  | value | [ValueType](#valuetype) | Yes| New value to store. It can be a number, string, or Boolean value.|
+
+| Name  | Type                    | Mandatory | Description                                                  |
+| ----- | ----------------------- | --------- | ------------------------------------------------------------ |
+| key   | string                  | Yes       | Key of the data. It cannot be empty.                         |
+| value | [ValueType](#valuetype) | Yes       | New value to store. It can be a number, string, or Boolean value. |
 
 **Example**
-  ```js
-  storage.putSync('startup', 'auto')
-  ```
+
+```js
+storage.putSync('startup', 'auto')
+```
 
 
 ### put
@@ -392,22 +485,24 @@ Obtains the **Storage** instance corresponding to the specified file, writes dat
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | key | string | Yes| Key of the data. It cannot be empty.|
-  | value | [ValueType](#valuetype) | Yes| New value to store. It can be a number, string, or Boolean value.|
-  | callback | AsyncCallback&lt;void&gt; | Yes| Callback that returns no value.|
+
+| Name     | Type                      | Mandatory | Description                                                  |
+| -------- | ------------------------- | --------- | ------------------------------------------------------------ |
+| key      | string                    | Yes       | Key of the data. It cannot be empty.                         |
+| value    | [ValueType](#valuetype)   | Yes       | New value to store. It can be a number, string, or Boolean value. |
+| callback | AsyncCallback&lt;void&gt; | Yes       | Callback that returns no value.                              |
 
 **Example**
-  ```js
-  storage.put('startup', 'auto', function (err) {
+
+```js
+storage.put('startup', 'auto', function (err) {
     if (err) {
-          console.info("Put the value of startup failed with err: " + err)
-          return
+        console.info("Failed to put the value of startup with err: " + err);
+        return;
     }
-      console.info("Put the value of startup successfully.")
-  })
-  ```
+    console.info("Succeeded in putting the value of startup.");
+})
+```
 
 
 ### put
@@ -419,25 +514,27 @@ Obtains the **Storage** instance corresponding to the specified file, writes dat
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | key | string | Yes| Key of the data. It cannot be empty.|
-  | value | [ValueType](#valuetype) | Yes| New value to store. It can be a number, string, or Boolean value.|
+
+| Name  | Type                    | Mandatory | Description                                                  |
+| ----- | ----------------------- | --------- | ------------------------------------------------------------ |
+| key   | string                  | Yes       | Key of the data. It cannot be empty.                         |
+| value | [ValueType](#valuetype) | Yes       | New value to store. It can be a number, string, or Boolean value. |
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | Promise&lt;void&gt; | Promise that returns no value.|
+
+| Type                | Description                    |
+| ------------------- | ------------------------------ |
+| Promise&lt;void&gt; | Promise that returns no value. |
 
 **Example**
-  ```js
-  let promiseput = storage.put('startup', 'auto')
-  promiseput.then(() => {
-      console.info("Put the value of startup successfully.")
-  }).catch((err) => {
-      console.info("Put the value of startup failed with err: " + err)
-  })
-  ```
+```js
+let promiseput = storage.put('startup', 'auto');
+promiseput.then(() => {
+    console.info("Succeeded in putting the value of startup.");
+}).catch((err) => {
+    console.info("Failed to put the value of startup with err: " + err);
+})
+```
 
 
 ### hasSync
@@ -449,22 +546,25 @@ Checks whether the storage object contains data with a given key.
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | key | string | Yes| Key of the data. It cannot be empty.|
+
+| Name | Type   | Mandatory | Description                          |
+| ---- | ------ | --------- | ------------------------------------ |
+| key  | string | Yes       | Key of the data. It cannot be empty. |
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | boolean | Returns **true** if the storage object contains data with the specified key; returns **false** otherwise.|
+
+| Type    | Description                                                  |
+| ------- | ------------------------------------------------------------ |
+| boolean | Returns **true** if the storage object contains data with the specified key; returns **false** otherwise. |
 
 **Example**
-  ```js
-  let isExist = storage.hasSync('startup')
-  if (isExist) {
-      console.info("The key of startup is contained.")
-  }
-  ```
+
+```js
+let isExist = storage.hasSync('startup');
+if (isExist) {
+    console.info("The key of startup is contained.");
+}
+```
 
 
 ### has
@@ -476,28 +576,31 @@ Checks whether the storage object contains data with a given key. This API uses
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | key | string | Yes| Key of the data. It cannot be empty.|
-  | callback | AsyncCallback&lt;boolean&gt; | Yes| Callback used to return the execution result.|
+
+| Name     | Type                         | Mandatory | Description                                   |
+| -------- | ---------------------------- | --------- | --------------------------------------------- |
+| key      | string                       | Yes       | Key of the data. It cannot be empty.          |
+| callback | AsyncCallback&lt;boolean&gt; | Yes       | Callback used to return the execution result. |
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | boolean | Returns **true** if the storage object contains data with the specified key; returns **false** otherwise.|
+
+| Type    | Description                                                  |
+| ------- | ------------------------------------------------------------ |
+| boolean | Returns **true** if the storage object contains data with the specified key; returns **false** otherwise. |
 
 **Example**
-  ```js
-  storage.has('startup', function (err, isExist) {
+
+```js
+storage.has('startup', function (err, isExist) {
     if (err) {
-          console.info("Check the key of startup failed with err: " + err)
-          return
+        console.info("Failed to check the key of startup with err: " + err);
+        return;
     }
     if (isExist) {
-          console.info("The key of startup is contained.")
+        console.info("The key of startup is contained.");
     }
-  })
-  ```
+})
+```
 
 
 ### has
@@ -509,26 +612,29 @@ Checks whether the storage object contains data with a given key. This API uses
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | key | string | Yes| Key of the data. It cannot be empty.|
+
+| Name | Type   | Mandatory | Description                          |
+| ---- | ------ | --------- | ------------------------------------ |
+| key  | string | Yes       | Key of the data. It cannot be empty. |
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | Promise&lt;boolean&gt; | Promise used to return the result.|
+
+| Type                   | Description                        |
+| ---------------------- | ---------------------------------- |
+| Promise&lt;boolean&gt; | Promise used to return the result. |
 
 **Example**
-  ```js
-  let promisehas = storage.has('startup')
-  promisehas.then((isExist) => {
+
+```js
+let promisehas = storage.has('startup')
+promisehas.then((isExist) => {
     if (isExist) {
-          console.info("The key of startup is contained.")
+        console.info("The key of startup is contained.");
     }
-  }).catch((err) => {
-      console.info("Check the key of startup failed with err: " + err)
-  })
-  ```
+}).catch((err) => {
+    console.info("Failed to check the key of startup with err: " + err);
+})
+```
 
 
 ### deleteSync
@@ -540,14 +646,16 @@ Deletes data with the specified key from this storage object.
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | key | string | Yes| Key of the data. It cannot be empty.|
+
+| Name | Type   | Mandatory | Description                          |
+| ---- | ------ | --------- | ------------------------------------ |
+| key  | string | Yes       | Key of the data. It cannot be empty. |
 
 **Example**
-  ```js
-  storage.deleteSync('startup')
-  ```
+
+```js
+storage.deleteSync('startup')
+```
 
 
 ### delete
@@ -559,21 +667,23 @@ Deletes data with the specified key from this storage object. This API uses an a
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | key | string | Yes| Key of the data. It cannot be empty.|
-  | callback | AsyncCallback&lt;void&gt; | Yes| Callback that returns no value.|
+
+| Name     | Type                      | Mandatory | Description                          |
+| -------- | ------------------------- | --------- | ------------------------------------ |
+| key      | string                    | Yes       | Key of the data. It cannot be empty. |
+| callback | AsyncCallback&lt;void&gt; | Yes       | Callback that returns no value.      |
 
 **Example**
-  ```js
-  storage.delete('startup', function (err) {
+
+```js
+storage.delete('startup', function (err) {
     if (err) {
-          console.info("Delete startup key failed with err: " + err)
-          return
+        console.info("Failed to delete startup key failed err: " + err);
+        return;
     }
-      console.info("Deleted startup key successfully.")
-  })
-  ```
+    console.info("Succeeded in deleting startup key.");
+})
+```
 
 
 ### delete
@@ -585,24 +695,27 @@ Deletes data with the specified key from this storage object. This API uses a pr
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | key | string | Yes| Key of the data.|
+
+| Name | Type   | Mandatory | Description      |
+| ---- | ------ | --------- | ---------------- |
+| key  | string | Yes       | Key of the data. |
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | Promise&lt;void&gt; | Promise that returns no value.|
+
+| Type                | Description                    |
+| ------------------- | ------------------------------ |
+| Promise&lt;void&gt; | Promise that returns no value. |
 
 **Example**
-  ```js
-  let promisedel = storage.delete('startup')
-  promisedel.then(() => {
-      console.info("Deleted startup key successfully.")
-  }).catch((err) => {
-      console.info("Delete startup key failed with err: " + err)
-  })
-  ```
+
+```js
+let promisedel = storage.delete('startup')
+promisedel.then(() => {
+    console.info("Succeeded in deleting startup key.");
+}).catch((err) => {
+    console.info("Failed to delete startup key failed err: " + err);
+})
+```
 
 
 ### flushSync
@@ -614,9 +727,10 @@ Saves the modification of this object to the **Storage** instance and synchroniz
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Example**
-  ```js
-  storage.flushSync()
-  ```
+
+```js
+storage.flushSync()
+```
 
 
 ### flush
@@ -628,20 +742,22 @@ Saves the modification of this object to the **Storage** instance and synchroniz
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | callback | AsyncCallback&lt;void&gt; | Yes| Callback that returns no value.|
+
+| Name     | Type                      | Mandatory | Description                     |
+| -------- | ------------------------- | --------- | ------------------------------- |
+| callback | AsyncCallback&lt;void&gt; | Yes       | Callback that returns no value. |
 
 **Example**
-  ```js
-  storage.flush(function (err) {
+
+```js
+storage.flush(function (err) {
     if (err) {
-          console.info("Flush to file failed with err: " + err)
-          return
+        console.info("Failed to flush to file with err: " + err);
+        return;
     }
-      console.info("Flushed to file successfully.")
-  })
-  ```
+    console.info("Succeeded in flushing to file.");
+})
+```
 
 
 ### flush
@@ -653,19 +769,21 @@ Saves the modification of this object to the **Storage** instance and synchroniz
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | Promise&lt;void&gt; | Promise that returns no value.|
+
+| Type                | Description                    |
+| ------------------- | ------------------------------ |
+| Promise&lt;void&gt; | Promise that returns no value. |
 
 **Example**
-  ```js
-  let promiseflush = storage.flush()
-  promiseflush.then(() => {
-      console.info("Flushed to file successfully.")
-  }).catch((err) => {
-      console.info("Flush to file failed with err: " + err)
-  })
-  ```
+
+```js
+let promiseflush = storage.flush();
+promiseflush.then(() => {
+    console.info("Succeeded in flushing to file.");
+}).catch((err) => {
+    console.info("Failed to flush to file with err: " + err);
+})
+```
 
 
 ### clearSync
@@ -677,9 +795,10 @@ Clears this **Storage** object.
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Example**
-  ```js
-  storage.clearSync()
-  ```
+
+```js
+storage.clearSync()
+```
 
 
 ### clear
@@ -691,20 +810,22 @@ Clears this **Storage** object. This API uses an asynchronous callback to return
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Mandatory| Description|
-  | -------- | -------- | -------- | -------- |
-  | callback | AsyncCallback&lt;void&gt; | Yes| Callback that returns no value.|
+
+| Name     | Type                      | Mandatory | Description                     |
+| -------- | ------------------------- | --------- | ------------------------------- |
+| callback | AsyncCallback&lt;void&gt; | Yes       | Callback that returns no value. |
 
 **Example**
-  ```js
-  storage.clear(function (err) {
+
+```js
+storage.clear(function (err) {
     if (err) {
-          console.info("Clear to file failed with err: " + err)
-          return
+        console.info("Failed to clear the storage with err: " + err);
+        return;
     }
-      console.info("Cleared to file successfully.")
-  })
-  ```
+    console.info("Succeeded in clearing the storage.");
+})
+```
 
 
 ### clear
@@ -716,19 +837,21 @@ Clears this **Storage** object. This API uses a promise to return the result.
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Return value**
-  | Type| Description|
-  | -------- | -------- |
-  | Promise&lt;void&gt; | Promise that returns no value.|
+
+| Type                | Description                    |
+| ------------------- | ------------------------------ |
+| Promise&lt;void&gt; | Promise that returns no value. |
 
 **Example**
-  ```js
-  let promiseclear = storage.clear()
-  promiseclear.then(() => {
-      console.info("Cleared to file successfully.")
-  }).catch((err) => {
-      console.info("Clear to file failed with err: " + err)
-  })
-  ```
+
+```js
+let promiseclear = storage.clear();
+promiseclear.then(() => {
+    console.info("Succeeded in clearing the storage.");
+}).catch((err) => {
+    console.info("Failed to clear the storage with err: " + err);
+})
+```
 
 
 ### on('change')
@@ -740,20 +863,22 @@ Subscribes to data changes. The **StorageObserver** needs to be implemented. Whe
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Description|
-  | -------- | -------- | -------- |
-  | type | string | Event type. The value **change** indicates data change events.|
-  | callback | Callback&lt;[StorageObserver](#storageobserver)&gt; | Callback used to return data changes.|
+
+| Name     | Type                                                | Description                                                  |
+| -------- | --------------------------------------------------- | ------------------------------------------------------------ |
+| type     | string                                              | Event type. The value **change** indicates data change events. |
+| callback | Callback&lt;[StorageObserver](#storageobserver)&gt; | Callback used to return data changes.                        |
 
 **Example**
-  ```js
-  var observer = function (key) {
-      console.info("The key of " + key + " changed.")
-  }
-  storage.on('change', observer)
-  storage.putSync('startup', 'auto')
-  storage.flushSync()  // observer will be called.
-  ```
+
+```js
+var observer = function (key) {
+    console.info("The key of " + key + " changed.");
+}
+storage.on('change', observer);
+storage.putSync('startup', 'auto');
+storage.flushSync();  // observer will be called.
+```
 
 
 ### off('change')
@@ -765,27 +890,29 @@ Unsubscribes from data changes.
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 **Parameters**
-  | Name| Type| Description|
-  | -------- | -------- | -------- |
-  | type | string | Event type. The value **change** indicates data change events.|
-  | callback | Callback&lt;[StorageObserver](#storageobserver)&gt; | Callback used to return data changes.|
+
+| Name     | Type                                                | Description                                                  |
+| -------- | --------------------------------------------------- | ------------------------------------------------------------ |
+| type     | string                                              | Event type. The value **change** indicates data change events. |
+| callback | Callback&lt;[StorageObserver](#storageobserver)&gt; | Callback used to return data changes.                        |
 
 **Example**
-  ```js
-  var observer = function (key) {
-      console.info("The key of " + key + " changed.")
-  }
-  storage.off('change', observer)
-  ```
+
+```js
+var observer = function (key) {
+    console.info("The key of " + key + " changed.");
+}
+storage.off('change', observer);
+```
 
 
 ## StorageObserver
 
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
-| Name| Type| Mandatory| Description|
-| -------- | -------- | -------- | -------- |
-| key | string | No| Data changed.|
+| Name | Type   | Mandatory | Description   |
+| ---- | ------ | --------- | ------------- |
+| key  | string | No        | Data changed. |
 
 ## ValueType
 
@@ -794,7 +921,7 @@ Enumerates the value types.
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
 | Type    | Description                   |
-| ------- | -------------------- |
+| ------- | ----------------------------- |
 | number  | The value is a number.        |
 | string  | The value is a string.        |
-| boolean | The value is of Boolean type.|
+| boolean | The value is of Boolean type. |
\ No newline at end of file

zh-cn/application-dev/reference/apis/js-apis-data-storage.md

@@ -21,7 +21,7 @@ import data_storage from '@ohos.data.storage';
 **系统能力：** 以下各项对应的系统能力均为SystemCapability.DistributedDataManager.Preferences.Core
 
 | 名称             | 参数类型 | 可读 | 可写 | 说明                                  |
-| -------- | -------- | -------- | -------- | -------- |
+| ---------------- | -------- | ---- | ---- | ------------------------------------- |
 | MAX_KEY_LENGTH   | string   | 是   | 否   | key的最大长度限制，需小于80字节。     |
 | MAX_VALUE_LENGTH | string   | 是   | 否   | value的最大长度限制，需小于8192字节。 |
 
@@ -35,25 +35,33 @@ getStorageSync(path: string): Storage
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | path | string | 是 | 应用程序内部数据存储路径。 |
+
+| 参数名 | 类型   | 必填 | 说明                       |
+| ------ | ------ | ---- | -------------------------- |
+| path   | string | 是   | 应用程序内部数据存储路径。 |
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | [Storage](#storage) | 获取到要操作的Storage实例，用于进行数据存储操作。 |
 
-**示例：**
-  ```js
-  import data_storage from '@ohos.data.storage'
+| 类型                | 说明                                              |
+| ------------------- | ------------------------------------------------- |
+| [Storage](#storage) | 获取到要操作的Storage实例，用于进行数据存储操作。 |
 
-  let path = '/data/storage/el2/database'
-  let storage = data_storage.getStorageSync(path + '/mystore')
-  storage.putSync('startup', 'auto')
-  storage.flushSync()
+**示例：**
 
-  ```
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+let storage = data_storage.getStorageSync(path + '/mystore');
+storage.putSync('startup', 'auto');
+storage.flushSync();
+```
 
 
 ## data_storage.getStorage
@@ -65,25 +73,33 @@ getStorage(path: string, callback: AsyncCallback<Storage>): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | path | string | 是 | 应用程序内部数据存储路径。 |
-  | callback | AsyncCallback<[Storage](#storage)> | 是 | 回调函数。 |
+
+| 参数名   | 类型                                     | 必填 | 说明                       |
+| -------- | ---------------------------------------- | ---- | -------------------------- |
+| path     | string                                   | 是   | 应用程序内部数据存储路径。 |
+| callback | AsyncCallback<[Storage](#storage)> | 是   | 回调函数。                 |
 
 **示例：**
-  ```js
-  import data_storage from '@ohos.data.storage'
 
-  let path = '/data/storage/el2/database'
-  data_storage.getStorage(path + '/mystore', function (err, storage) {
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+data_storage.getStorage(path + '/mystore', function (err, storage) {
     if (err) {
-          console.info("Get the storage failed, path: " + path + '/mystore')
+        console.info("Failed to get the storage. path: " + path + '/mystore');
         return;
     }
-      storage.putSync('startup', 'auto')
-      storage.flushSync()
-  })
-  ```
+    storage.putSync('startup', 'auto');
+    storage.flushSync();
+})
+```
 
 
 ## data_storage.getStorage
@@ -95,29 +111,37 @@ getStorage(path: string): Promise<Storage>
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | path | string | 是 | 应用程序内部数据存储路径。 |
+
+| 参数名 | 类型   | 必填 | 说明                       |
+| ------ | ------ | ---- | -------------------------- |
+| path   | string | 是   | 应用程序内部数据存储路径。 |
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | Promise<[Storage](#storage)> | Promise实例，用于异步获取结果。 |
 
-**示例：**
-  ```js
-  import data_storage from '@ohos.data.storage'
+| 类型                               | 说明                            |
+| ---------------------------------- | ------------------------------- |
+| Promise<[Storage](#storage)> | Promise实例，用于异步获取结果。 |
 
-  let path = '/data/storage/el2/database'
+**示例：**
 
-  let getPromise = data_storage.getStorage(path + '/mystore')
-  getPromise.then((storage) => {
-      storage.putSync('startup', 'auto')
-      storage.flushSync()
-  }).catch((err) => {
-      console.info("Get the storage failed, path: " + path + '/mystore')
-  })
-  ```
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+let getPromise = data_storage.getStorage(path + '/mystore');
+getPromise.then((storage) => {
+    storage.putSync('startup', 'auto');
+    storage.flushSync();
+}).catch((err) => {
+    console.info("Failed to get the storage. path: " + path + '/mystore');
+})
+```
 
 
 ## data_storage.deleteStorageSync
@@ -129,15 +153,25 @@ deleteStorageSync(path: string): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | path | string | 是 | 应用程序内部数据存储路径。 |
+
+| 参数名 | 类型   | 必填 | 说明                       |
+| ------ | ------ | ---- | -------------------------- |
+| path   | string | 是   | 应用程序内部数据存储路径。 |
 
 **示例：**
-  ```js
-  let path = '/data/storage/el2/database'
-  data_storage.deleteStorageSync(path + '/mystore')
-  ```
+
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+data_storage.deleteStorageSync(path + '/mystore');
+```
 
 
 ## data_storage.deleteStorage
@@ -149,22 +183,32 @@ deleteStorage(path: string, callback: AsyncCallback<void>): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | path | string | 是 | 应用程序内部数据存储路径。 |
-  | callback | AsyncCallback<void> | 是 | 回调函数。 |
+
+| 参数名   | 类型                      | 必填 | 说明                       |
+| -------- | ------------------------- | ---- | -------------------------- |
+| path     | string                    | 是   | 应用程序内部数据存储路径。 |
+| callback | AsyncCallback<void> | 是   | 回调函数。                 |
 
 **示例：**
-  ```js
-  let path = '/data/storage/el2/database'
-  data_storage.deleteStorage(path + '/mystore', function (err) {
+
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+data_storage.deleteStorage(path + '/mystore', function (err) {
     if (err) {
-          console.info("Deleted failed with err: " + err)
-          return
+        console.info("Failed to delete the storage with err: " + err);
+        return;
     }
-      console.info("Deleted successfully.")
-  })
-  ```
+    console.info("Succeeded in deleting the storage.");
+})
+```
 
 
 ## data_storage.deleteStorage
@@ -176,25 +220,36 @@ deleteStorage(path: string): Promise<void>
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | path | string | 是 | 应用程序内部数据存储路径。 |
+
+| 参数名 | 类型   | 必填 | 说明                       |
+| ------ | ------ | ---- | -------------------------- |
+| path   | string | 是   | 应用程序内部数据存储路径。 |
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | Promise<void> | Promise实例，用于异步获取结果。 |
+
+| 类型                | 说明                            |
+| ------------------- | ------------------------------- |
+| Promise<void> | Promise实例，用于异步获取结果。 |
 
 **示例：**
-  ```js
-  let path = '/data/storage/el2/database'
-  let promisedelSt = data_storage.deleteStorage(path + '/mystore')
-  promisedelSt.then(() => {
-      console.info("Deleted successfully.")
-  }).catch((err) => {
-      console.info("Deleted failed with err: " + err)
-  })
-  ```
+
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+let promisedelSt = data_storage.deleteStorage(path + '/mystore');
+promisedelSt.then(() => {
+    console.info("Succeeded in deleting the storage.");
+}).catch((err) => {
+    console.info("Failed to delete the storage with err: " + err);
+})
+```
 
 
 ## data_storage.removeStorageFromCacheSync
@@ -206,15 +261,24 @@ removeStorageFromCacheSync(path: string): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | path | string | 是 | 应用程序内部数据存储路径。 |
+| 参数名 | 类型   | 必填 | 说明                       |
+| ------ | ------ | ---- | -------------------------- |
+| path   | string | 是   | 应用程序内部数据存储路径。 |
 
 **示例：**
-  ```js
-  let path = '/data/storage/el2/database'
-  data_storage.removeStorageFromCacheSync(path + '/mystore')
-  ```
+
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+data_storage.removeStorageFromCacheSync(path + '/mystore');
+```
 
 
 ## data_storage.removeStorageFromCache
@@ -226,22 +290,32 @@ removeStorageFromCache(path: string, callback: AsyncCallback<void>): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | path | string | 是 | 应用程序内部数据存储路径。 |
-  | callback | AsyncCallback<void> | 是 | 回调函数。 |
+
+| 参数名   | 类型                      | 必填 | 说明                       |
+| -------- | ------------------------- | ---- | -------------------------- |
+| path     | string                    | 是   | 应用程序内部数据存储路径。 |
+| callback | AsyncCallback<void> | 是   | 回调函数。                 |
 
 **示例：**
-  ```js
-  let path = '/data/storage/el2/database'
-  data_storage.removeStorageFromCache(path + '/mystore', function (err) {
+
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+data_storage.removeStorageFromCache(path + '/mystore', function (err) {
     if (err) {
-          console.info("Removed storage from cache failed with err: " + err)
-          return
+        console.info("Failed to remove storage from cache with err: " + err);
+        return;
     }
-      console.info("Removed storage from cache successfully.")
-  })
-  ```
+    console.info("Succeeded in removing storage from cache.");
+})
+```
 
 
 ## data_storage.removeStorageFromCache
@@ -253,25 +327,36 @@ removeStorageFromCache(path: string): Promise<void>
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | path | string | 是 | 应用程序内部数据存储路径。 |
+
+| 参数名 | 类型   | 必填 | 说明                       |
+| ------ | ------ | ---- | -------------------------- |
+| path   | string | 是   | 应用程序内部数据存储路径。 |
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | Promise<void> | Promise实例，用于异步获取结果。 |
+
+| 类型                | 说明                            |
+| ------------------- | ------------------------------- |
+| Promise<void> | Promise实例，用于异步获取结果。 |
 
 **示例：**
-  ```js
-  let path = '/data/storage/el2/database'
-  let promiserevSt = data_storage.removeStorageFromCache(path + '/mystore')
-  promiserevSt.then(() => {
-      console.info("Removed storage from cache successfully.")
-  }).catch((err) => {
-      console.info("Removed storage from cache failed with err: " + err)
-  })
-  ```
+
+```js
+import featureAbility from '@ohos.ability.featureAbility';
+
+var path;
+var context = featureAbility.getContext();
+context.getFilesDir().then((filePath) => {
+    path = filePath;
+    console.info("======================>getFilesDirPromsie====================>");
+});  
+
+let promiserevSt = data_storage.removeStorageFromCache(path + '/mystore')
+promiserevSt.then(() => {
+    console.info("Succeeded in removing storage from cache.");
+}).catch((err) => {
+    console.info("Failed to remove storage from cache with err: " + err);
+})
+```
 
 
 ## Storage
@@ -288,21 +373,24 @@ getSync(key: string, defValue: ValueType): ValueType
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | key | string | 是 | 要获取的存储key名称，不能为空。 |
-  | defValue | [ValueType](#valuetype) | 是 | 给定key的存储不存在，则要返回的默认值。支持number、string、boolean。 |
+
+| 参数名   | 类型                    | 必填 | 说明                                                         |
+| -------- | ----------------------- | ---- | ------------------------------------------------------------ |
+| key      | string                  | 是   | 要获取的存储key名称，不能为空。                              |
+| defValue | [ValueType](#valuetype) | 是   | 给定key的存储不存在，则要返回的默认值。支持number、string、boolean。 |
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | ValueType | 键对应的值，如果值为null或者非默认值类型，返回默认数据。 |
+
+| 类型      | 说明                                                     |
+| --------- | -------------------------------------------------------- |
+| ValueType | 键对应的值，如果值为null或者非默认值类型，返回默认数据。 |
 
 **示例：**
-  ```js
-  let value = storage.getSync('startup', 'default')
-  console.info("The value of startup is " + value)
-  ```
+
+```js
+let value = storage.getSync('startup', 'default');
+console.info("The value of startup is " + value);
+```
 
 
 ### get
@@ -314,22 +402,24 @@ get(key: string, defValue: ValueType, callback: AsyncCallback<ValueType>):
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | key | string | 是 | 要获取的存储key名称，不能为空。 |
-  | defValue | [ValueType](#valuetype) | 是 | 默认返回值。支持number、string、boolean。 |
-  | callback | AsyncCallback<ValueType> | 是 | 回调函数。 |
+
+| 参数名   | 类型                           | 必填 | 说明                                      |
+| -------- | ------------------------------ | ---- | ----------------------------------------- |
+| key      | string                         | 是   | 要获取的存储key名称，不能为空。           |
+| defValue | [ValueType](#valuetype)        | 是   | 默认返回值。支持number、string、boolean。 |
+| callback | AsyncCallback<ValueType> | 是   | 回调函数。                                |
 
 **示例：**
-  ```js
-  storage.get('startup', 'default', function(err, value) {
+
+```js
+storage.get('startup', 'default', function(err, value) {
     if (err) {
-          console.info("Get the value of startup failed with err: " + err)
-          return
+        console.info("Failed to get the value of startup with err: " + err);
+        return;
       }
-      console.info("The value of startup is " + value)
-  })
-  ```
+    console.info("The value of startup is " + value);
+})
+```
 
 
 ### get
@@ -343,24 +433,26 @@ get(key: string, defValue: ValueType): Promise<ValueType>
 **参数：**
 
 | 参数名   | 类型                    | 必填 | 说明                                      |
-| -------- | -------- | -------- | -------- |
+| -------- | ----------------------- | ---- | ----------------------------------------- |
 | key      | string                  | 是   | 要获取的存储key名称，不能为空。           |
 | defValue | [ValueType](#valuetype) | 是   | 默认返回值。支持number、string、boolean。 |
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | Promise<ValueType> | Promise实例，用于异步获取结果。 |
+
+| 类型                     | 说明                            |
+| ------------------------ | ------------------------------- |
+| Promise<ValueType> | Promise实例，用于异步获取结果。 |
 
 **示例：**
-  ```js
-  let promiseget = storage.get('startup', 'default')
-  promiseget.then((value) => {
+
+```js
+let promiseget = storage.get('startup', 'default');
+promiseget.then((value) => {
     console.info("The value of startup is " + value)
-  }).catch((err) => {
-      console.info("Get the value of startup failed with err: " + err)
-  })
-  ```
+}).catch((err) => {
+    console.info("Failed to get the value of startup with err: " + err);
+})
+```
 
 
 ### putSync
@@ -372,15 +464,17 @@ putSync(key: string, value: ValueType): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | key | string | 是 | 要修改的存储的key，不能为空。 |
-  | value | [ValueType](#valuetype) | 是 | 存储的新值。支持number、string、boolean。 |
+
+| 参数名 | 类型                    | 必填 | 说明                                      |
+| ------ | ----------------------- | ---- | ----------------------------------------- |
+| key    | string                  | 是   | 要修改的存储的key，不能为空。             |
+| value  | [ValueType](#valuetype) | 是   | 存储的新值。支持number、string、boolean。 |
 
 **示例：**
-  ```js
-  storage.putSync('startup', 'auto')
-  ```
+
+```js
+storage.putSync('startup', 'auto');
+```
 
 
 ### put
@@ -392,22 +486,24 @@ put(key: string, value: ValueType, callback: AsyncCallback<void>): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | key | string | 是 | 要修改的存储的key，不能为空。 |
-  | value | [ValueType](#valuetype) | 是 | 存储的新值。支持number、string、boolean。 |
-  | callback | AsyncCallback<void> | 是 | 回调函数。 |
+
+| 参数名   | 类型                      | 必填 | 说明                                      |
+| -------- | ------------------------- | ---- | ----------------------------------------- |
+| key      | string                    | 是   | 要修改的存储的key，不能为空。             |
+| value    | [ValueType](#valuetype)   | 是   | 存储的新值。支持number、string、boolean。 |
+| callback | AsyncCallback<void> | 是   | 回调函数。                                |
 
 **示例：**
-  ```js
-  storage.put('startup', 'auto', function (err) {
+
+```js
+storage.put('startup', 'auto', function (err) {
     if (err) {
-          console.info("Put the value of startup failed with err: " + err)
-          return
+        console.info("Failed to put the value of startup with err: " + err);
+        return;
     }
-      console.info("Put the value of startup successfully.")
-  })
-  ```
+    console.info("Succeeded in putting the value of startup.");
+})
+```
 
 
 ### put
@@ -419,25 +515,28 @@ put(key: string, value: ValueType): Promise<void>
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | key | string | 是 | 要修改的存储的key，不能为空。 |
-  | value | [ValueType](#valuetype) | 是 | 存储的新值。支持number、string、boolean。 |
+
+| 参数名 | 类型                    | 必填 | 说明                                      |
+| ------ | ----------------------- | ---- | ----------------------------------------- |
+| key    | string                  | 是   | 要修改的存储的key，不能为空。             |
+| value  | [ValueType](#valuetype) | 是   | 存储的新值。支持number、string、boolean。 |
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | Promise<void> | Promise实例，用于异步处理。 |
+
+| 类型                | 说明                        |
+| ------------------- | --------------------------- |
+| Promise<void> | Promise实例，用于异步处理。 |
 
 **示例：**
-  ```js
-  let promiseput = storage.put('startup', 'auto')
-  promiseput.then(() => {
-      console.info("Put the value of startup successfully.")
-  }).catch((err) => {
-      console.info("Put the value of startup failed with err: " + err)
-  })
-  ```
+
+```js
+let promiseput = storage.put('startup', 'auto');
+promiseput.then(() => {
+    console.info("Succeeded in putting the value of startup.");
+}).catch((err) => {
+    console.info("Failed to put the value of startup with err: " + err);
+})
+```
 
 
 ### hasSync
@@ -449,22 +548,25 @@ hasSync(key: string): boolean
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | key | string | 是 | 要获取的存储key名称，不能为空。 |
+
+| 参数名 | 类型   | 必填 | 说明                            |
+| ------ | ------ | ---- | ------------------------------- |
+| key    | string | 是   | 要获取的存储key名称，不能为空。 |
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | boolean | true 表示存在，false表示不存在。 |
+
+| 类型    | 说明                                  |
+| ------- | ------------------------------------- |
+| boolean | true 表示存在，false表示不存在。 |
 
 **示例：**
-  ```js
-  let isExist = storage.hasSync('startup')
-  if (isExist) {
-      console.info("The key of startup is contained.")
-  }
-  ```
+
+```js
+let isExist = storage.hasSync('startup');
+if (isExist) {
+    console.info("The key of startup is contained.");
+}
+```
 
 
 ### has
@@ -476,28 +578,31 @@ has(key: string, callback: AsyncCallback<boolean>): boolean
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | key | string | 是 | 要获取的存储key名称，不能为空。 |
-  | callback | AsyncCallback<boolean> | 是 | 回调函数。 |
+
+| 参数名   | 类型                         | 必填 | 说明                            |
+| -------- | ---------------------------- | ---- | ------------------------------- |
+| key      | string                       | 是   | 要获取的存储key名称，不能为空。 |
+| callback | AsyncCallback<boolean> | 是   | 回调函数。                      |
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | boolean | true表示存在，false表示不存在。 |
+
+| 类型    | 说明                            |
+| ------- | ------------------------------- |
+| boolean | true表示存在，false表示不存在。 |
 
 **示例：**
-  ```js
-  storage.has('startup', function (err, isExist) {
+
+```js
+storage.has('startup', function (err, isExist) {
     if (err) {
-          console.info("Check the key of startup failed with err: " + err)
-          return
+        console.info("Failed to check the key of startup with err: " + err);
+        return;
     }
     if (isExist) {
-          console.info("The key of startup is contained.")
+        console.info("The key of startup is contained.");
     }
-  })
-  ```
+})
+```
 
 
 ### has
@@ -509,26 +614,29 @@ has(key: string): Promise<boolean>
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | key | string | 是 | 要获取的存储key名称，不能为空。 |
+
+| 参数名 | 类型   | 必填 | 说明                            |
+| ------ | ------ | ---- | ------------------------------- |
+| key    | string | 是   | 要获取的存储key名称，不能为空。 |
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | Promise<boolean> | Promise实例，用于异步处理。 |
+
+| 类型                   | 说明                        |
+| ---------------------- | --------------------------- |
+| Promise<boolean> | Promise实例，用于异步处理。 |
 
 **示例：**
-  ```js
-  let promisehas = storage.has('startup')
-  promisehas.then((isExist) => {
+
+```js
+let promisehas = storage.has('startup')
+promisehas.then((isExist) => {
     if (isExist) {
-          console.info("The key of startup is contained.")
+        console.info("The key of startup is contained.");
     }
-  }).catch((err) => {
-      console.info("Check the key of startup failed with err: " + err)
-  })
-  ```
+}).catch((err) => {
+    console.info("Failed to check the key of startup with err: " + err);
+})
+```
 
 
 ### deleteSync
@@ -540,14 +648,16 @@ deleteSync(key: string): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | key | string | 是 | 要获取的存储key名称。它不能为空。 |
+
+| 参数名 | 类型   | 必填 | 说明                              |
+| ------ | ------ | ---- | --------------------------------- |
+| key    | string | 是   | 要获取的存储key名称。它不能为空。 |
 
 **示例：**
-  ```js
-  storage.deleteSync('startup')
-  ```
+
+```js
+ storage.deleteSync('startup');
+```
 
 
 ### delete
@@ -559,21 +669,23 @@ delete(key: string, callback: AsyncCallback<void>): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | key | string | 是 | 要获取的存储key名称，不能为空。 |
-  | callback | AsyncCallback<void> | 是 | 回调函数。 |
+
+| 参数名   | 类型                      | 必填 | 说明                            |
+| -------- | ------------------------- | ---- | ------------------------------- |
+| key      | string                    | 是   | 要获取的存储key名称，不能为空。 |
+| callback | AsyncCallback<void> | 是   | 回调函数。                      |
 
 **示例：**
-  ```js
-  storage.delete('startup', function (err) {
+
+```js
+storage.delete('startup', function (err) {
     if (err) {
-          console.info("Delete startup key failed with err: " + err)
-          return
+        console.info("Failed to delete startup key failed err: " + err);
+        return;
     }
-      console.info("Deleted startup key successfully.")
-  })
-  ```
+    console.info("Succeeded in deleting startup key.");
+})
+```
 
 
 ### delete
@@ -585,24 +697,27 @@ delete(key: string): Promise<void>
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | key | string | 是 | 要获取的存储key名称。 |
+
+| 参数名 | 类型   | 必填 | 说明                  |
+| ------ | ------ | ---- | --------------------- |
+| key    | string | 是   | 要获取的存储key名称。 |
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | Promise<void> | Promise实例，用于异步处理。 |
+
+| 类型                | 说明                        |
+| ------------------- | --------------------------- |
+| Promise<void> | Promise实例，用于异步处理。 |
 
 **示例：**
-  ```js
-  let promisedel = storage.delete('startup')
-  promisedel.then(() => {
-      console.info("Deleted startup key successfully.")
-  }).catch((err) => {
-      console.info("Delete startup key failed with err: " + err)
-  })
-  ```
+
+```js
+let promisedel = storage.delete('startup')
+promisedel.then(() => {
+    console.info("Succeeded in deleting startup key.");
+}).catch((err) => {
+    console.info("Failed to delete startup key failed err: " + err);
+})
+```
 
 
 ### flushSync
@@ -614,9 +729,10 @@ flushSync(): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **示例：**
-  ```js
-  storage.flushSync()
-  ```
+
+```js
+storage.flushSync();
+```
 
 
 ### flush
@@ -628,20 +744,22 @@ flush(callback: AsyncCallback<void>): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | callback | AsyncCallback<void> | 是 | 回调函数。 |
+
+| 参数名   | 类型                      | 必填 | 说明       |
+| -------- | ------------------------- | ---- | ---------- |
+| callback | AsyncCallback<void> | 是   | 回调函数。 |
 
 **示例：**
-  ```js
-  storage.flush(function (err) {
+
+```js
+storage.flush(function (err) {
     if (err) {
-          console.info("Flush to file failed with err: " + err)
-          return
+        console.info("Failed to flush to file with err: " + err);
+        return;
     }
-      console.info("Flushed to file successfully.")
-  })
-  ```
+    console.info("Succeeded in flushing to file.");
+})
+```
 
 
 ### flush
@@ -653,19 +771,21 @@ flush(): Promise<void>
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | Promise<void> | Promise实例，用于异步处理。 |
+
+| 类型                | 说明                        |
+| ------------------- | --------------------------- |
+| Promise<void> | Promise实例，用于异步处理。 |
 
 **示例：**
-  ```js
-  let promiseflush = storage.flush()
-  promiseflush.then(() => {
-      console.info("Flushed to file successfully.")
-  }).catch((err) => {
-      console.info("Flush to file failed with err: " + err)
-  })
-  ```
+
+```js
+let promiseflush = storage.flush();
+promiseflush.then(() => {
+    console.info("Succeeded in flushing to file.");
+}).catch((err) => {
+    console.info("Failed to flush to file with err: " + err);
+})
+```
 
 
 ### clearSync
@@ -677,9 +797,10 @@ clearSync(): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **示例：**
-  ```js
-  storage.clearSync()
-  ```
+
+```js
+storage.clearSync();
+```
 
 
 ### clear
@@ -691,20 +812,22 @@ clear(callback: AsyncCallback<void>): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 必填 | 说明 |
-  | -------- | -------- | -------- | -------- |
-  | callback | AsyncCallback<void> | 是 | 回调函数。 |
+
+| 参数名   | 类型                      | 必填 | 说明       |
+| -------- | ------------------------- | ---- | ---------- |
+| callback | AsyncCallback<void> | 是   | 回调函数。 |
 
 **示例：**
-  ```js
-  storage.clear(function (err) {
+
+```js
+storage.clear(function (err) {
     if (err) {
-          console.info("Clear to file failed with err: " + err)
-          return
+        console.info("Failed to clear the storage with err: " + err);
+        return;
     }
-      console.info("Cleared to file successfully.")
-  })
-  ```
+    console.info("Succeeded in clearing the storage.");
+})
+```
 
 
 ### clear
@@ -716,19 +839,20 @@ clear(): Promise<void>
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **返回值：**
-  | 类型 | 说明 |
-  | -------- | -------- |
-  | Promise<void> | Promise实例，用于异步处理。 |
+| 类型                | 说明                        |
+| ------------------- | --------------------------- |
+| Promise<void> | Promise实例，用于异步处理。 |
 
 **示例：**
-  ```js
-  let promiseclear = storage.clear()
-  promiseclear.then(() => {
-      console.info("Cleared to file successfully.")
-  }).catch((err) => {
-      console.info("Clear to file failed with err: " + err)
-  })
-  ```
+
+```js
+let promiseclear = storage.clear();
+promiseclear.then(() => {
+    console.info("Succeeded in clearing the storage.");
+}).catch((err) => {
+    console.info("Failed to clear the storage with err: " + err);
+})
+```
 
 
 ### on('change')
@@ -740,20 +864,22 @@ on(type: 'change', callback: Callback<StorageObserver>): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 说明 |
-  | -------- | -------- | -------- |
-  | type | string | 事件类型，固定值'change'，表示数据变更。 |
-  | callback | Callback<[StorageObserver](#storageobserver)> | 回调对象实例。 |
+
+| 参数名   | 类型                                                | 说明                                     |
+| -------- | --------------------------------------------------- | ---------------------------------------- |
+| type     | string                                              | 事件类型，固定值'change'，表示数据变更。 |
+| callback | Callback<[StorageObserver](#storageobserver)> | 回调对象实例。                           |
 
 **示例：**
-  ```js
-  var observer = function (key) {
-      console.info("The key of " + key + " changed.")
-  }
-  storage.on('change', observer)
-  storage.putSync('startup', 'auto')
-  storage.flushSync()  // observer will be called.
-  ```
+
+```js
+var observer = function (key) {
+    console.info("The key of " + key + " changed.");
+}
+storage.on('change', observer);
+storage.putSync('startup', 'auto');
+storage.flushSync();  // observer will be called.
+```
 
 
 ### off('change')
@@ -765,26 +891,28 @@ off(type: 'change', callback: Callback<StorageObserver>): void
 **系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 **参数：**
-  | 参数名 | 类型 | 说明 |
-  | -------- | -------- | -------- |
-  | type | string | 事件类型，固定值'change'，表示数据变更。 |
-  | callback | Callback<[StorageObserver](#storageobserver)> | 需要取消的回调对象实例。 |
+
+| 参数名   | 类型                                                | 说明                                     |
+| -------- | --------------------------------------------------- | ---------------------------------------- |
+| type     | string                                              | 事件类型，固定值'change'，表示数据变更。 |
+| callback | Callback<[StorageObserver](#storageobserver)> | 需要取消的回调对象实例。                 |
 
 **示例：**
-  ```js
-  var observer = function (key) {
-      console.info("The key of " + key + " changed.")
-  }
-  storage.off('change', observer)
-  ```
+
+```js
+var observer = function (key) {
+    console.info("The key of " + key + " changed.");
+}
+storage.off('change', observer);
+```
 
 
 ## StorageObserver
 
-**系统能力：** 以下各项对应的系统能力均为SystemCapability.DistributedDataManager.Preferences.Core
+**系统能力：** SystemCapability.DistributedDataManager.Preferences.Core
 
 | 名称 | 参数类型 | 必填 | 说明             |
-| -------- | -------- | -------- | -------- |
+| ---- | -------- | ---- | ---------------- |
 | key  | string   | 否   | 变更的数据内容。 |
 
 ## ValueType

zh-cn/application-dev/reference/apis/js-apis-window.md

@@ -1554,13 +1554,14 @@ setSystemBarEnable(names: Array<'status' | 'navigation'>, callback: AsyncCallbac
 **示例：**
 
 ```js
-var names = ["status", "navigation"];
+// 此处以不显示导航栏、状态栏为例
+var names = [];
 windowClass.setSystemBarEnable(names, (err, data) => {
     if (err.code) {
-        console.error('Failed to set the system bar to be visible. Cause:' + JSON.stringify(err));
+        console.error('Failed to set the system bar to be invisible. Cause:' + JSON.stringify(err));
         return;
     }
-    console.info('Succeeded in setting the system bar to be visible. Data: ' + JSON.stringify(data));
+    console.info('Succeeded in setting the system bar to be invisible. Data: ' + JSON.stringify(data));
 });
 ```
 
@@ -1587,12 +1588,13 @@ setSystemBarEnable(names: Array<'status' | 'navigation'>): Promise&lt;void&gt;
 **示例：**
 
 ```js
-var names = ["status", "navigation"];
+// 此处以不显示导航栏、状态栏为例
+var names = [];
 let promise = windowClass.setSystemBarEnable(names);
 promise.then((data)=> {
-    console.info('Succeeded in setting the system bar to be visible. Data: ' + JSON.stringify(data));
+    console.info('Succeeded in setting the system bar to be invisible. Data: ' + JSON.stringify(data));
 }).catch((err)=>{
-    console.error('Failed to set the system bar to be visible. Cause:' + JSON.stringify(err));
+    console.error('Failed to set the system bar to be invisible. Cause:' + JSON.stringify(err));
 });
 ```
 

zh-cn/application-dev/windowmanager/application-window-fa.md

@@ -197,7 +197,7 @@
      console.info('Succeeded in enabling the full-screen mode. Data: ' + JSON.stringify(data));
    });
    // 2.实现沉浸式效果。方式二：设置导航栏、状态栏不显示。
-   var names = null;
+   var names = [];
    mainWindowClass.setSystemBarEnable(names, (err, data) => {
      if (err.code) {
        console.error('Failed to set the system bar to be visible. Cause:' + JSON.stringify(err));

zh-cn/application-dev/windowmanager/application-window-stage.md

@@ -241,7 +241,7 @@ class MainAbility extends Ability {
                    console.info('Succeeded in enabling the full-screen mode. Data: ' + JSON.stringify(data));
                });
                // 2.实现沉浸式效果。方式二：设置导航栏、状态栏不显示。
-               var names = null;
+               var names = [];
                windowClass.setSystemBarEnable(names, (err, data) => {
                    if (err.code) {
                        console.error('Failed to set the system bar to be visible. Cause:' + JSON.stringify(err));