update docs

Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>

en/application-dev/reference/apis/Readme-EN.md

@@ -132,6 +132,7 @@
   - [@ohos.environment](js-apis-environment.md)
   - [@ohos.fileio](js-apis-fileio.md)
   - [@ohos.fileManager](js-apis-filemanager.md)
+  - [@ohos.securityLabel](js-apis-securityLabel.md)
   - [@ohos.statfs](js-apis-statfs.md)
   - [@ohos.storageStatistics](js-apis-storage-statistics.md)
   - [@ohos.volumeManager](js-apis-volumemanager.md)

en/application-dev/reference/apis/js-apis-securityLabel.md

+# Security Label
+
+> **NOTE**<br/>
+> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+
+Manages file data security levels, including obtaining and setting file data security levels.
+
+## Modules to Import
+
+```js
+import securityLabel from '@ohos.securityLabel';
+```
+
+## Usage
+
+Before using the APIs provided by this module to perform operations on a file or directory, obtain the path of the application sandbox. For details, see [getOrCreateLocalDir of the Context module](js-apis-Context.md).
+
+Application sandbox path of a file or directory = Application directory + File name or directory name
+
+For example, if the application directory obtained by using **getOrCreateLocalDir** is **dir** and the file name is **xxx.txt**, the application sandbox path of the file is as follows:
+
+```js
+let path = dir + "/xxx.txt";
+```
+
+The file descriptor is as follows:
+
+```js
+let fd = fileio.openSync(path, 0o102, 0o666);
+```
+
+## securityLabel.setSecurityLabel
+
+setSecurityLabel(path:string, dataLevel:string):Promise&lt;void&gt;
+
+Sets the security label for a file in asynchronous mode. This API uses a promise to return the result.
+
+**System capability**: SystemCapability.FileManagement.File.DistributedFile
+
+**Parameters**
+
+| Name   | Type  | Mandatory| Description                                        |
+| --------- | ------ | ---- | -------------------------------------------- |
+| path      | string | Yes  | File path.                                    |
+| dataLevel | string | Yes  | File security level, which can be **s0**, **s1**, **s2**, **s3**, or **s4**.|
+
+**Return value**
+
+  | Type               | Description            |
+  | ------------------- | ---------------- |
+  | Promise&lt;void&gt; | Promise used to return the result. An empty value will be returned.|
+
+**Example**
+
+  ```js
+  securityLabel.setSecurityLabel(path, dataLevel).then(function(){
+      console.info("setSecurityLabel successfully");
+  }).catch(function(error){
+      console.info("setSecurityLabel failed with error:" + error);
+  });
+  ```
+
+## securityLabel.setSecurityLabel
+
+setSecurityLabel(path:string, dataLevel:string, callback: AsyncCallback&lt;void&gt;):void
+
+Sets the security label for a file in asynchronous mode. This API uses a callback to return the result.
+
+**System capability**: SystemCapability.FileManagement.File.DistributedFile
+
+**Parameters**
+
+| Name   | Type                     | Mandatory| Description                                        |
+| --------- | ------------------------- | ---- | -------------------------------------------- |
+| path      | string                    | Yes  | File path.                                    |
+| dataLevel | string                    | Yes  | File security level, which can be **s0**, **s1**, **s2**, **s3**, or **s4**.|
+| callback  | AsyncCallback&lt;void&gt; | Yes  | Callback used to return the result.                  |
+
+**Example**
+
+  ```js
+  securityLabel.setSecurityLabel(path, dataLevel, function(error){
+      console.info("setSecurityLabel:" + JSON.stringify(error));
+  });
+  ```
+## securityLabel.setSecurityLabelSync
+
+setSecurityLabelSync(path:string, dataLevel:string):void
+
+Sets the security label for a file in synchronous mode.
+
+**System capability**: SystemCapability.FileManagement.File.DistributedFile
+
+**Parameters**
+
+| Name   | Type  | Mandatory| Description                                        |
+| --------- | ------ | ---- | -------------------------------------------- |
+| path      | string | Yes  | File path.                                    |
+| dataLevel | string | Yes  | File security level, which can be **s0**, **s1**, **s2**, **s3**, or **s4**.|
+
+**Example**
+
+```js
+securityLabel.setSecurityLabelSync(path, dataLevel);
+```
+
+## securityLabel.getSecurityLabel
+
+getSecurityLabel(path:string):Promise&lt;string&gt;
+
+Obtains the security label of a file in asynchronous mode. This API uses a promise to return the result.
+
+**System capability**: SystemCapability.FileManagement.File.DistributedFile
+
+**Parameters**
+
+  | Name| Type  | Mandatory| Description    |
+  | ------ | ------ | ---- | -------- |
+  | path   | string | Yes  | File path.|
+
+**Return value**
+
+  | Type                 | Description        |
+  | --------------------- | ------------ |
+  | Promise&lt;string&gt; | Promise used to return the security label obtained.|
+
+**Example**
+
+  ```js
+  securityLabel.getSecurityLabel(path).then(function(dataLevel){
+      console.log("getSecurityLabel successfully:" + dataLevel);
+  }).catch(function(error){
+      console.log("getSecurityLabel failed with error:" + error);
+  });
+  ```
+
+## securityLabel.getSecurityLabel
+
+getSecurityLabel(path:string, callback:AsyncCallback&lt;string&gt;): void
+
+Obtains the security label of a file in asynchronous mode. This API uses a callback to return the result.
+
+**System capability**: SystemCapability.FileManagement.File.DistributedFile
+
+**Parameters**
+
+  | Name  | Type                       | Mandatory| Description                      |
+  | -------- | --------------------------- | ---- | -------------------------- |
+  | path     | string                      | Yes  | File path.                  |
+  | callback | AsyncCallback&lt;string&gt; | Yes  | Callback used to return the security label obtained.|
+
+**Example**
+
+  ```js
+  securityLabel.getSecurityLabel(function(error, dataLevel){
+      console.log("getSecurityLabel successfully:" + dataLevel);
+  });
+  ```
+## securityLabel.getSecurityLabelSync
+
+getSecurityLabelSync(path:string):string
+
+Obtains the security label of a file in synchronous mode.
+
+**System capability**: SystemCapability.FileManagement.File.DistributedFile
+
+**Parameters**
+
+| Name| Type  | Mandatory| Description    |
+| ------ | ------ | ---- | -------- |
+| path   | string | Yes  | File path.|
+
+**Return value**
+
+| Type  | Description        |
+| ------ | ------------ |
+| string | Security label obtained.|
+
+**Example**
+
+```js
+let result = securityLabel.getSecurityLabelSync(path);
+console.log("getSecurityLabel successfully:" + result);
+```

en/application-dev/reference/apis/js-apis-statfs.md

 # statfs
 
-> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**<br/>
+> **NOTE**<br>
 > The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
 
+Obtains file system information, including the total number of bytes and the number of idle bytes of the file system.
+
 ## Modules to Import
 
 ```js
 import statfs from '@ohos.statfs';
 ```
-
-## Guidelines
-
-Before using this module to perform operations on a file or directory, obtain the absolute path of the file or directory. For details, see [getOrCreateLocalDir of the Context module](js-apis-Context.md).
-
-Absolute file or directory path = Application directory + File name or directory name
-
-For example, if the application directory obtained by using **getOrCreateLocalDir** is **dir** and the file name is **xxx.txt**, the absolute path of the file is as follows:
-
-```js
-let path = dir + "xxx.txt";
-```
-
 ## statfs.getFreeBytes
 
 getFreeBytes(path:string):Promise&lt;number&gt;
 
-Obtains the number of free bytes of the specified file system in asynchronous mode. This method uses a promise to return the result.
+Obtains the number of free bytes of the specified file system in asynchronous mode. This API uses a promise to return the result.
 
 **System capability**: SystemCapability.FileManagement.File.FileIO
 
@@ -56,7 +45,7 @@ Obtains the number of free bytes of the specified file system in asynchronous mo
 
 getFreeBytes(path:string, callback:AsyncCallback&lt;number&gt;): void
 
-Obtains the number of free bytes of the specified file system in asynchronous mode. This method uses a callback to return the result.
+Obtains the number of free bytes of the specified file system in asynchronous mode. This API uses a callback to return the result.
 
 **System capability**: SystemCapability.FileManagement.File.FileIO
 
@@ -70,8 +59,12 @@ Obtains the number of free bytes of the specified file system in asynchronous mo
 - Example
 
   ```js
-  statfs.getFreeBytes(path, function(err, number){
-      console.info("getFreeBytes callback successfully:"+ number);
+   import featureAbility from '@ohos.ability.featureAbility';
+  let context = featureAbility.getContext();
+  context.getFilesDir().then(function (path) {
+      statfs.getFreeBytes(path, function(err, number){
+          console.info("getFreeBytes callback successfully:"+ number);
+      });
   });
   ```
 
@@ -79,7 +72,7 @@ Obtains the number of free bytes of the specified file system in asynchronous mo
 
 getTotalBytes(path: string): Promise&lt;number&gt;
 
-Obtains the total number of bytes of the specified file system in asynchronous mode. This method uses a promise to return the result.
+Obtains the total number of bytes of the specified file system in asynchronous mode. This API uses a promise to return the result.
 
 **System capability**: SystemCapability.FileManagement.File.FileIO
 
@@ -110,7 +103,7 @@ Obtains the total number of bytes of the specified file system in asynchronous m
 
 getTotalBytes(path: string, callback: AsyncCallback&lt;number&gt;): void
 
-Obtains the total number of bytes of the specified file system in asynchronous mode. This method uses a callback to return the result.
+Obtains the total number of bytes of the specified file system in asynchronous mode. This API uses a callback to return the result.
 
 **System capability**: SystemCapability.FileManagement.File.FileIO
 
@@ -124,7 +117,11 @@ Obtains the total number of bytes of the specified file system in asynchronous m
 - Example
 
   ```js
-  statfs.getTotalBytes(path, function(err, number){
-      console.info("getTotalBytes callback successfully:"+ number);
+  import featureAbility from '@ohos.ability.featureAbility';
+  let context = featureAbility.getContext();
+  context.getFilesDir().then(function (path) {
+      statfs.getTotalBytes(path, function(err, number){
+          console.info("getTotalBytes callback successfully:"+ number);
+      });
   });
   ```