update docs

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

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

@@ -311,6 +311,69 @@ class EntryAbility extends UIAbility {
 }
 ```
 
+## data_preferences.getPreferencesSync<sup>10+</sup>
+
+getPreferencesSync(context: Context, options: Options): Preferences
+
+Obtains the **Preferences** instance. This API is a synchronous interface.
+
+**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
+
+**Parameters**
+
+| Name | Type                 | Mandatory| Description                                                        |
+| ------- | --------------------- | ---- | ------------------------------------------------------------ |
+| context | Context               | Yes  | Application context.<br>For details about the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For details about the application context of the stage model, see [Context](js-apis-inner-application-uiAbilityContext.md).|
+| options | [Options](#options10) | Yes  | Configuration options of the **Preferences** instance.                           |
+
+**Return value**
+
+| Type                       | Description                 |
+| --------------------------- | --------------------- |
+| [Preferences](#preferences) | **Preferences** instance obtained.|
+
+**Error codes**
+
+For details about the error codes, see [User Preference Error Codes](../errorcodes/errorcode-preferences.md).
+
+| ID| Error Message                       |
+| -------- | ------------------------------- |
+| 15501001 | Only supported in stage mode.   |
+| 15501002 | The data group id is not valid. |
+
+**Example**
+
+FA model:
+
+```js
+// Obtain the context.
+import featureAbility from '@ohos.ability.featureAbility';
+let context = featureAbility.getContext();
+let preferences = null;
+
+try {
+    preferences = data_preferences.getPreferencesSync(context, { name: 'mystore' });
+} catch(err) {
+    console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+}
+```
+
+Stage model:
+
+```ts
+import UIAbility from '@ohos.app.ability.UIAbility';
+let preferences = null;
+
+class EntryAbility extends UIAbility {
+    onWindowStageCreate(windowStage) {
+        try {
+            preferences = data_preferences.getPreferencesSync(this.context, { name: 'mystore', dataGroupId:'myId' });
+        } catch(err) {
+            console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+        }
+    }
+}
+```
 
 ## data_preferences.deletePreferences
 
@@ -737,7 +800,7 @@ class EntryAbility extends UIAbility {
 
 removePreferencesFromCacheSync(context: Context, name: string): void
 
-Synchronously removes a **Preferences** instance from the cache.
+Removes a **Preferences** instance from the cache. This API returns the result synchronously.
 
 After an application calls [getPreferences](#data_preferencesgetpreferences) for the first time to obtain a **Preferences** instance, the obtained **Preferences** instance is cached. When the application calls [getPreferences](#data_preferencesgetpreferences) again, the **Preferences** instance will be read from the cache instead of from the persistent file. After this API is called to remove the instance from the cache, calling **getPreferences** again will read data from the persistent file and create a new **Preferences** instance.
 
@@ -930,6 +993,65 @@ class EntryAbility extends UIAbility {
 }
 ```
 
+## data_preferences.removePreferencesFromCacheSync<sup>10+</sup>
+
+removePreferencesFromCacheSync(context: Context, options: Options):void
+
+Removes a **Preferences** instance from the cache. This API returns the result synchronously.
+
+After an application calls [getPreferences](#data_preferencesgetpreferences) for the first time to obtain a **Preferences** instance, the obtained **Preferences** instance is cached. When the application calls [getPreferences](#data_preferencesgetpreferences) again, the **Preferences** instance will be read from the cache instead of from the persistent file. After this API is called to remove the instance from the cache, calling **getPreferences** again will read data from the persistent file and create a new **Preferences** instance.
+
+After the **Preferences** instance is removed, do not use it to perform data operations. Otherwise, data inconsistency may be caused. For this purpose, set the removed **Preferences** instance to null. The system will reclaim the removed **Preferences** instances in a unified manner.
+
+**System capability**: SystemCapability.DistributedDataManager.Preferences.Core
+
+**Parameters**
+
+| Name | Type                 | Mandatory| Description                                                        |
+| ------- | --------------------- | ---- | ------------------------------------------------------------ |
+| context | Context               | Yes  | Application context.<br>For details about the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For details about the application context of the stage model, see [Context](js-apis-inner-application-uiAbilityContext.md).|
+| options | [Options](#options10) | Yes  | Configuration options of the **Preferences** instance.                           |
+
+**Error codes**
+
+For details about the error codes, see [User Preference Error Codes](../errorcodes/errorcode-preferences.md).
+
+| ID| Error Message                       |
+| -------- | ------------------------------- |
+| 15501001 | Only supported in stage mode.   |
+| 15501002 | The data group id is not valid. |
+
+**Example**
+
+FA model:
+
+```js
+// Obtain the context.
+import featureAbility from '@ohos.ability.featureAbility';
+let context = featureAbility.getContext();
+try {
+    data_preferences.removePreferencesFromCacheSync(context, { name: 'mystore' });
+} catch(err) {
+    console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+}
+```
+
+Stage model:
+
+```ts
+import UIAbility from '@ohos.app.ability.UIAbility';
+
+class EntryAbility extends UIAbility {
+    onWindowStageCreate(windowStage) {
+        try {
+            data_preferences.removePreferencesFromCacheSync(this.context, { name: 'mystore', dataGroupId:'myId' });
+        } catch(err) {
+            console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+        }
+    }
+}
+```
+
 ## Options<sup>10+</sup>
 
 Represents the configuration options of a **Preferences** instance.
@@ -1021,7 +1143,7 @@ try {
 
 getSync(key: string, defValue: ValueType): ValueType
 
-Synchronously obtains the value corresponding to the specified key from the cached **Preferences** instance. If the value is null or is not of the default value type, **defValue** is returned.
+Obtains the value corresponding to the specified key from the cached **Preferences** instance. This API returns the result synchronously. If the value is null or is not of the default value type, **defValue** is returned.
 
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
@@ -1117,7 +1239,7 @@ try {
 
 getAllSync(): Object
 
-Obtains all KV pairs from the cached **Preferences** instance synchronously.
+Obtains all KV pairs from the cached **Preferences** instance. This API returns the result synchronously.
 
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
@@ -1214,7 +1336,7 @@ try {
 
 putSync(key: string, value: ValueType): void
 
-Synchronously writes data to the cached **Preferences** instance. You can use [flush](#flush) to persist the **Preferences** instance.
+Writes data to the cached **Preferences** instance. This API returns the result synchronously. You can use [flush](#flush) to persist the **Preferences** instance.
 
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
@@ -1316,7 +1438,7 @@ try {
 
 hasSync(key: string): boolean
 
-Synchronously checks whether the cached **Preferences** instance contains the KV pair of the given key.
+Checks whether the cached **Preferences** instance contains the KV pair of the given key. This API returns the result synchronously.
 
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
@@ -1420,7 +1542,7 @@ try {
 
 deleteSync(key: string): void
 
-Synchronously deletes a KV pair from the cached **Preferences** instance based on the specified key. You can use [flush](#flush) to persist the **Preferences** instance.
+Deletes a KV pair from the cached **Preferences** instance based on the specified key. This API returns the result synchronously. You can use [flush](#flush) to persist the **Preferences** instance.
 
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
@@ -1567,7 +1689,7 @@ try {
 
 clearSync(): void
 
-Synchronously clears all data in the cached **Preferences** instance. You can use [flush](#flush) to persist the **Preferences** instance.
+Clears all data in the cached **Preferences** instance. This API returns the result synchronously. You can use [flush](#flush) to persist the **Preferences** instance.
 
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core