!21239 翻译完成 20324：【壁纸】增加WallpaerExtensionAbility.md

Merge pull request !21239 from ester.zhou/TR-20324

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

+# @ohos.WallpaperExtensionAbility (WallpaperExtensionAbility)
+
+The **WallpaperExtensionAbility** module provides APIs for developing wallpaper extension abilities and managing the lifecycle of these extension abilities.
+
+> **NOTE**
+>
+> The initial APIs of this module are supported since API version 10. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+>
+> The APIs of this module can be used only in the FA model.
+>
+> The APIs provided by this module are system APIs.
+
+## Modules to Import
+
+```js
+import WallpaperExtensionAbility from '@ohos.WallpaperExtensionAbility';
+```
+
+## WallpaperExtensionAbility.onCreate
+
+onCreate(want: object): void
+
+Called to initialize a wallpaper extension ability when it is launched.
+
+**System capability**: SystemCapability.MiscServices.Wallpaper
+
+**Parameters**
+
+| Name| Type         | Mandatory| Description                            |
+| ------ | ----------- | ---- | ------------------------------- |
+| want   | [object](js-apis-app-ability-want.md) | Yes  | Want information related to the wallpaper extension ability, including the ability name and bundle name.|
+
+**Example**
+
+```js
+import WallpaperExtensionAbility from '@ohos.WallpaperExtensionAbility';
+
+class WallpaperExt extends WallpaperExtensionAbility {
+    onCreate(want) {
+        console.log('onCreate, want:' + want.abilityName);
+    }
+}
+```
+
+## WallpaperExtensionAbility.onWallpaperChange
+
+onWallpaperChange(wallpaperType: number): void
+
+Called when the wallpaper changes.
+
+**System capability**: SystemCapability.MiscServices.Wallpaper
+
+**Parameters**
+
+| Name| Type       | Mandatory| Description                  |
+| ------ | --------- | --- |----------------------|
+| wallpaperType  | number | Yes | Wallpaper type. **0**: home screen wallpaper.<br>**1**: lock screen wallpaper.|
+
+**Example**
+
+```js
+import WallpaperExtensionAbility from '@ohos.WallpaperExtensionAbility';
+
+class WallpaperExt extends WallpaperExtensionAbility {
+    onWallpaperChange(wallpaperType) {
+        console.log('onWallpaperChange, wallpaperType:' + wallpaperType);
+    }
+}
+```
+
+## WallpaperExtensionAbility.onDestroy
+
+onDestroy(): void
+
+Called when this wallpaper extension ability is destroyed to clear resources.
+
+**System capability**: SystemCapability.MiscServices.Wallpaper
+
+**Example**
+
+```js
+import WallpaperExtensionAbility from '@ohos.WallpaperExtensionAbility';
+
+class WallpaperExt extends WallpaperExtensionAbility {
+    onDestroy() {
+        console.log('onDestroy');
+    }
+}
+```