!15228 [翻译完成】I6DYGQ

Merge pull request !15228 from Annie_wang/PR14434

en/application-dev/database/database-datashare-guidelines.md

@@ -13,7 +13,7 @@ The **DataShare** module allows an application to manage its own data and share
 |query?(uri: string, predicates: DataSharePredicates, columns: Array<string>, callback: AsyncCallback<Object>): void|Queries data from the database.|
 |delete?(uri: string, predicates: DataSharePredicates, callback: AsyncCallback<number>): void|Deletes data from the database.|
 
-For details about the data provider APIs, see [DataShareExtensionAbility](../reference/apis/js-apis-application-DataShareExtensionAbility.md).
+For details about the data provider APIs, see [DataShareExtensionAbility](../reference/apis/js-apis-application-dataShareExtensionAbility.md).
 
 **Table 2** APIs of the data consumer
 
@@ -34,11 +34,49 @@ There are two roles in **DataShare**:
 - Data provider: adds, deletes, modifies, and queries data, opens files, and shares data.
 - Data consumer: accesses the data provided by the provider using **DataShareHelper**.
 
-Examples are given below.
-
 ### Data Provider Application Development (Only for System Applications)
 
-1. Import dependencies.
+[DataShareExtensionAbility](../reference/apis/js-apis-application-dataShareExtensionAbility.md) provides the following APIs. You can override these APIs as required.
+
+- **onCreate**
+
+  Called by the server to initialize service logic when the **DataShare** client connects to the **DataShareExtensionAbility** server.
+
+- **insert**
+
+  Inserts data. This API is called when the client requests to insert data.
+
+- **update**
+
+  Updates data. This API is called when the client requests to update data.
+
+- **delete**
+
+  Deletes data. This API is called when the client requests to delete data.
+
+- **query**
+
+  Queries data. This API is called when the client requests to query data.
+
+- **batchInsert**
+
+  Batch inserts data. This API is called when the client requests to batch insert data.
+
+- **normalizeUri**
+
+  Converts the URI provided by the client to the URI used by the server.
+
+- **denormalizeUri**
+
+  Converts the URI used by the server to the initial URI passed by the client.
+
+Before implementing a **DataShare** service, you need to create a **DataShareExtensionAbility** object in the DevEco Studio project as follows:
+
+1. In the **ets** directory of the **Module** project, right-click and choose **New > Directory** to create a directory named **DataShareAbility**.
+
+2. Right-click the **DataShareAbility** directory, and choose **New > TypeScript File** to create a file named **DataShareAbility.ts**.
+
+3. In the **DataShareAbility.ts** file, import **DataShareExtensionAbility** and other dependencies. 
 
    ```ts
    import Extension from '@ohos.application.DataShareExtensionAbility';
@@ -47,9 +85,9 @@ Examples are given below.
    import dataSharePredicates from '@ohos.data.dataSharePredicates';
    ```
 
-2. Override **DataShareExtensionAbility** APIs based on actual requirements. For example, if the data provider provides only data query, override only **query()**.
+4. Override **DataShareExtensionAbility** APIs based on actual requirements. For example, if the data provider provides only data query, override only **query()**.
 
-3. Implement the data provider services. For example, implement data storage of the data provider by using a database, reading and writing files, or accessing the network.
+5. Implement the data provider services. For example, implement data storage of the data provider by using a database, reading and writing files, or accessing the network.
 
    ```ts
    const DB_NAME = "DB00.db";
@@ -66,7 +104,7 @@ Examples are given below.
    
    	// Override onCreate().
        onCreate(want, callback) {
-           result = this.context.cacheDir + '/datashare.txt'
+           result = this.context.cacheDir + '/datashare.txt';
            // Create an RDB store.
             rdb.getRdbStore(this.context, {
                 name: DB_NAME,
@@ -76,7 +114,9 @@ Examples are given below.
                 rdbStore.executeSql(DDL_TBL_CREATE, [], function (err) {
                     console.log('DataShareExtAbility onCreate, executeSql done err:' + JSON.stringify(err));
                });
+               if (callback) {
                     callback();
+               }
            });
        }
    
@@ -103,14 +143,15 @@ Examples are given below.
    };
    ```
 
-4. Define **DataShareExtensionAbility** in **module.json5**.
 
-   | Field| Description                                                    |
-   | ------------ | ------------------------------------------------------------ |
+6. Define **DataShareExtensionAbility** in **module.json5**.
+
+   | Field     | Description                                                  |
+   | --------- | ------------------------------------------------------------ |
    | "name"    | Ability name, corresponding to the **ExtensionAbility** class name derived from **Ability**. |
-   | "type"       | Ability type. The value is **dataShare**, indicating the development is based on the **datashare** template.|
+   | "type"    | Ability type. The value is **dataShare**, indicating the development is based on the **datashare** template. |
    | "uri"     | URI used for communication. It is the unique identifier for the data consumer to connect to the provider. |
-   | "visible"    | Whether it is visible to other applications. Data sharing is allowed only when the value is **true**.|
+   | "visible" | Whether it is visible to other applications. Data sharing is allowed only when the value is **true**. |
 
    **module.json5 example**
    
@@ -128,12 +169,14 @@ Examples are given below.
    ]
    ```
    
+   
+
 ### Data Consumer Application Development
 
 1. Import dependencies.
 
    ```ts
-   import Ability from '@ohos.application.Ability';
+   import UIAbility from '@ohos.app.ability.UIAbility';
    import dataShare from '@ohos.data.dataShare';
    import dataSharePredicates from '@ohos.data.dataSharePredicates';
    ```
@@ -151,7 +194,7 @@ Examples are given below.
    let dsHelper;
    let abilityContext;
 
-   export default class MainAbility extends Ability {
+   export default class EntryAbility extends UIAbility {
    	onWindowStageCreate(windowStage) {
    		abilityContext = this.context;
    		dataShare.createDataShareHelper(abilityContext, dseUri, (err, data)=>{
@@ -168,7 +211,7 @@ Examples are given below.
    let valuesBucket = { "name": "ZhangSan", "age": 21, "isStudent": false, "Binary": new Uint8Array([1, 2, 3]) };
    let updateBucket = { "name": "LiSi", "age": 18, "isStudent": true, "Binary": new Uint8Array([1, 2, 3]) };
    let predicates = new dataSharePredicates.DataSharePredicates();
-   let valArray = new Array("*");
+   let valArray = ['*'];
    // Insert a piece of data.
    dsHelper.insert(dseUri, valuesBucket, (err, data) => {
      console.log("dsHelper insert result: " + data);
@@ -186,4 +229,3 @@ Examples are given below.
      console.log("dsHelper delete result: " + data);
    });
    ```
-   

en/application-dev/database/database-mdds-guidelines.md

@@ -68,11 +68,11 @@ The following uses a single KV store as an example to describe the development p
     grantPermission();
    
     // Stage model
-    import AbilityStage from '@ohos.application.Ability';
+    import UIAbility from '@ohos.app.ability.UIAbility';
   
     let context = null;
   
-    class MainAbility extends AbilityStage {
+    class EntryAbility extends UIAbility {
       onWindowStageCreate(windowStage) {
         let context = this.context;
       }
@@ -103,9 +103,9 @@ The following uses a single KV store as an example to describe the development p
    let context = featureAbility.getContext();
    
    // Obtain the context of the stage model.
-   import AbilityStage from '@ohos.application.Ability';
+   import UIAbility from '@ohos.app.ability.UIAbility';
    let context = null;
-   class MainAbility extends AbilityStage{
+   class EntryAbility extends UIAbility {
       onWindowStageCreate(windowStage){
         context = this.context;
       }

en/application-dev/database/database-preference-guidelines.md

@@ -113,10 +113,10 @@ You can use the following APIs to delete a **Preferences** instance or data file
 
    ```ts
    // Obtain the context.
-   import Ability from '@ohos.application.Ability'
+   import UIAbility from '@ohos.app.ability.UIAbility'
    let context = null;
    let preferences = null;
-   export default class MainAbility extends Ability {
+   export default class EntryAbility extends UIAbility {
        onWindowStageCreate(windowStage){
            context = this.context;
        }
@@ -159,7 +159,7 @@ You can use the following APIs to delete a **Preferences** instance or data file
    
 5. Store data persistently.
 
-   Use **flush()** to flush data from the **Preferences** instance to its file.
+   Use **preferences.flush()** to flush data from the **Preferences** instance to its file.
 
    ```js
    preferences.flush();

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

@@ -175,7 +175,7 @@ Unsubscribes from the changes of the specified data. This API uses an asynchrono
 | -------- | -------------------- | ---- | ------------------------ |
 | type     | string               | Yes  | Event type to unsubscribe from. The value is **dataChange**, which indicates data change events.|
 | uri      | string               | Yes  | URI of the data.|
-| callback | AsyncCallback<void> | No  | Callback used to return the result. If the operation is successful, **err** is **undefined**. Otherwise, **err** is an error object.|
+| callback | AsyncCallback<void> | No  | Callback invoked to return the result. If the operation is successful, **err** is **undefined**. Otherwise, **err** is an error object.|
 
 **Example**
 

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

@@ -53,10 +53,10 @@ Stage model:
 ```ts
 // Import the module.
 import distributedObject from '@ohos.data.distributedDataObject';
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 // Obtain the context.
 let context;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context
     }
@@ -110,7 +110,7 @@ Called when the **revokeSave()** API is successfully called.
 
 ## DistributedObjectV9
 
-Provides APIs for managing a distributed data object.
+Represents a distributed data object.
 
 ### setSessionId<sup>9+</sup>
 
@@ -156,10 +156,10 @@ Stage model:
 
 ```ts
 import distributedObject from '@ohos.data.distributedDataObject';
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 // Obtain the context.
 let context;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context
     }
@@ -218,10 +218,10 @@ Stage model:
 
 ```ts
 import distributedObject from '@ohos.data.distributedDataObject';
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 // Obtain the context.
 let context;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context
     }
@@ -257,7 +257,7 @@ Sets a session ID for synchronization. Automatic synchronization is performed fo
 
 | Type| Description|
 | -------- | -------- |
-| Promise&lt;void&gt; | Promise used to|
+| Promise&lt;void&gt; | Promise that returns no value.|
 
 **Error codes**
 
@@ -294,10 +294,10 @@ Stage model:
 
 ```ts
 import distributedObject from '@ohos.data.distributedDataObject';
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 // Obtain the context.
 let context;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context
     }
@@ -321,7 +321,7 @@ g_object.setSessionId().then (()=>{
 
 on(type: 'change', callback: Callback<{ sessionId: string, fields: Array&lt;string&gt; }>): void
 
-Subscribes to data changes of this distributed data object.
+Subscribes to the data change of this distributed data object.
 
 **System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
 
@@ -357,10 +357,10 @@ Stage model:
 
 ```ts
 import distributedObject from '@ohos.data.distributedDataObject';
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 // Obtain the context.
 let context;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context
     }
@@ -381,7 +381,7 @@ g_object.on("change", globalThis.changeCallback);
 
 off(type: 'change', callback?: Callback<{ sessionId: string, fields: Array&lt;string&gt; }>): void
 
-Unsubscribes from the data changes of this distributed data object.
+Unsubscribes from the data change of this distributed data object.
 
 **System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
 
@@ -413,10 +413,10 @@ Stage model:
 
 ```ts
 import distributedObject from '@ohos.data.distributedDataObject';
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 // Obtain the context.
 let context;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context
     }
@@ -432,7 +432,7 @@ g_object.off("change");
 
 on(type: 'status', callback: Callback<{ sessionId: string, networkId: string, status: 'online' | 'offline' }>): void
 
-Subscribes to statue changes of this distributed data object.
+Subscribes to the status change of this distributed data object.
 
 **System capability**: SystemCapability.DistributedDataManager.DataObject.DistributedObject
 
@@ -463,10 +463,10 @@ Stage model:
 
 ```ts
 import distributedObject from '@ohos.data.distributedDataObject';
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 // Obtain the context.
 let context;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context
     }
@@ -507,7 +507,7 @@ let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:fals
 globalThis.statusCallback = (sessionId, networkId, status) => {
     globalThis.response += "status changed " + sessionId + " " + status + " " + networkId;
 }
-// Unregister the specified status change callback.
+// Unsubscribe from the specified status change callback for the distributed data object.
 g_object.off("status",globalThis.statusCallback);
 // Unregister all status change callbacks.
 g_object.off("status");
@@ -517,10 +517,10 @@ Stage model:
 
 ```ts
 import distributedObject from '@ohos.data.distributedDataObject'; 
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 // Obtain the context.
 let context;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context
     }
@@ -529,7 +529,7 @@ let g_object = distributedObject.create(context, {name:"Amy", age:18, isVis:fals
 globalThis.statusCallback = (sessionId, networkId, status) => {
     globalThis.response += "status changed " + sessionId + " " + status + " " + networkId;
 }
-// Unregister the specified status change callback.
+// Unsubscribe from all status change callbacks for the distributed data object.
 g_object.off("status",globalThis.statusCallback);
 // Unregister all status change callbacks.
 g_object.off("status");
@@ -579,10 +579,10 @@ g_object.save("local", (result) => {
 Stage model:
 ```ts
 import distributedObject from '@ohos.data.distributedDataObject';
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 // Obtain the context.
 let context;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context
     }
@@ -627,6 +627,8 @@ The saved data will be released in the following cases:
 
 **Example**
 
+FA model:
+
 ```js
 import distributedObject from '@ohos.data.distributedDataObject';
 import featureAbility from '@ohos.ability.featureAbility';
@@ -643,13 +645,14 @@ g_object.save("local").then((result) => {
     console.error("save failed");
 });
 ```
+Stage model:
 
 ```js
 import distributedObject from '@ohos.data.distributedDataObject';
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 // Obtain the context.
 let context;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context
     }
@@ -712,10 +715,10 @@ Stage model:
 
 ```ts
 import distributedObject from '@ohos.data.distributedDataObject';
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 // Obtain the context.
 let context;
-class MainAbility extends Ability {
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage) {
         context = this.context
     }
@@ -786,10 +789,10 @@ Stage model:
 
 ```ts
 import distributedObject from '@ohos.data.distributedDataObject';
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 // Obtain the context.
 let context;
-class MainAbility extends Ability {
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage) {
         context = this.context
     }
@@ -1000,7 +1003,7 @@ Unsubscribes from the status change of this distributed data object.
 
 | Name| Type| Mandatory| Description|
 | -------- | -------- | -------- | -------- |
-| type | string | Yes| Event type to unsubscribe from. The value is **status**, which indicates the status change (online or offline) of the distributed data object.|
+| type | string | Yes| Event type to unsubscribe from. The value is **status**, which indicates the status change (online or offline) of the distributed data object. |
 | callback | Callback<{ sessionId: string, deviceId: string, status: 'online' \| 'offline' }> | No| Callback for status changes. If this parameter is not specified, all status change callbacks of this distributed data object will be unsubscribed from.<br>**sessionId** indicates the session ID of the distributed data object.<br>**deviceId** indicates the device ID of the distributed data object.<br>**status** indicates the object status, which can be online or offline.|
 
 

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

@@ -38,7 +38,7 @@ Obtains a **Preferences** instance. This API uses an asynchronous callback to re
 
 | Name  | Type                                            | Mandatory| Description                                                        |
 | -------- | ------------------------------------------------ | ---- | ------------------------------------------------------------ |
-| context  | Context            | Yes  | Application context.<br>For the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md).                                                |
+| 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-ability-context.md).                                                |
 | name     | string                                           | Yes  | Name of the **Preferences** instance.|
 | callback | AsyncCallback&lt;[Preferences](#preferences)&gt; | Yes  | Callback invoked to return the result. If the operation is successful, **err** is **undefined** and **object** is the **Preferences** instance obtained. Otherwise, **err** is an error code.|
 
@@ -69,9 +69,9 @@ Stage model:
 
 ```ts
 // Obtain the context.
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 let context = null;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context;
     }
@@ -103,7 +103,7 @@ Obtains a **Preferences** instance. This API uses a promise to return the result
 
 | Name | Type                                 | Mandatory| Description                   |
 | ------- | ------------------------------------- | ---- | ----------------------- |
-| context | Context | Yes  | Application context.<br>For the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md).           |
+| 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-ability-context.md).           |
 | name    | string                                | Yes  | Name of the **Preferences** instance.|
 
 **Return value**
@@ -139,9 +139,9 @@ Stage model:
 
 ```ts
 // Obtain the context.
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 let context = null;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context;
     }
@@ -177,7 +177,7 @@ The deleted **Preferences** instance cannot be used for data operations. Otherwi
 
 | Name  | Type                                 | Mandatory| Description                                                |
 | -------- | ------------------------------------- | ---- | ---------------------------------------------------- |
-| context  | Context | Yes  | Application context.<br>For the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md).                                        |
+| 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-ability-context.md).                                        |
 | name     | string                                | Yes  | Name of the **Preferences** instance to delete.                          |
 | callback | AsyncCallback&lt;void&gt;             | Yes  | Callback invoked to return the result. If the operation is successful, **err** is **undefined**. Otherwise, **err** is an error code.|
 
@@ -215,9 +215,9 @@ Stage model:
 
 ```ts
 // Obtain the context.
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 let context = null;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context;
     }
@@ -252,7 +252,7 @@ The deleted **Preferences** instance cannot be used for data operations. Otherwi
 
 | Name | Type                                 | Mandatory| Description                   |
 | ------- | ------------------------------------- | ---- | ----------------------- |
-| context | Context | Yes  | Application context.<br>For the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md).           |
+| 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-ability-context.md).           |
 | name    | string                                | Yes  | Name of the **Preferences** instance to delete.|
 
 **Return value**
@@ -294,9 +294,9 @@ Stage model:
 
 ```ts
 // Obtain the context.
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 let context = null;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context;
     }
@@ -328,7 +328,7 @@ The removed **Preferences** instance cannot be used for data operations. Otherwi
 
 | Name  | Type                                 | Mandatory| Description                                                |
 | -------- | ------------------------------------- | ---- | ---------------------------------------------------- |
-| context  | Context | Yes  | Application context.<br>For the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md).                                        |
+| 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-ability-context.md).                                        |
 | name     | string                                | Yes  | Name of the **Preferences** instance to remove.                          |
 | callback | AsyncCallback&lt;void&gt;             | Yes  | Callback invoked to return the result. If the operation is successful, **err** is **undefined**. Otherwise, **err** is an error code.|
 
@@ -358,9 +358,9 @@ Stage model:
 
 ```ts
 // Obtain the context.
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 let context = null;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context;
     }
@@ -394,7 +394,7 @@ The removed **Preferences** instance cannot be used for data operations. Otherwi
 
 | Name | Type                                 | Mandatory| Description                   |
 | ------- | ------------------------------------- | ---- | ----------------------- |
-| context | Context | Yes  | Application context.<br>For the application context of the FA model, see [Context](js-apis-inner-app-context.md).<br>For the application context of the stage model, see [Context](js-apis-ability-context.md).           |
+| 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-ability-context.md).           |
 | name    | string                                | Yes  | Name of the **Preferences** instance to remove.|
 
 **Return value**
@@ -428,9 +428,9 @@ Stage model:
 
 ```ts
 // Obtain the context.
-import Ability from '@ohos.application.Ability';
+import UIAbility from '@ohos.app.ability.UIAbility';
 let context = null;
-class MainAbility extends Ability{
+class EntryAbility extends UIAbility {
     onWindowStageCreate(windowStage){
         context = this.context;
     }
@@ -662,7 +662,7 @@ try {
 
 has(key: string, callback: AsyncCallback&lt;boolean&gt;): void
 
-Checks whether this **Preferences** instance contains a KV pair with the given key. This API uses an asynchronous callback to return the result..
+Checks whether this **Preferences** instance contains a KV pair with the given key. This API uses an asynchronous callback to return the result.
 
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
@@ -698,7 +698,7 @@ try {
 
 has(key: string): Promise&lt;boolean&gt;
 
-Checks whether this **Preferences** instance contains a KV pair with the given key. This API uses a promise to return the result..
+Checks whether this **Preferences** instance contains a KV pair with the given key. This API uses a promise to return the result.
 
 **System capability**: SystemCapability.DistributedDataManager.Preferences.Core
 
@@ -987,7 +987,7 @@ Unsubscribes from data changes.
 | Name  | Type                            | Mandatory| Description                                      |
 | -------- | -------------------------------- | ---- | ------------------------------------------ |
 | type     | string                           | Yes  | Event type to unsubscribe from. The value **change** indicates data change events.  |
-| callback | Callback&lt;{ key : string }&gt; | No  | Callback to unregister. If this parameter is left blank, the callbacks used to subscribing to all data changes will be unregistered.|
+| callback | Callback&lt;{ key : string }&gt; | No  | Callback to unregister. If this parameter is left blank, all callbacks for data changes will be unregistered. |
 
 **Example**