!9502 Align 3.2-Beta2 to master

Merge pull request !9502 from 胡伟奇/OpenHarmony-3.2-Beta2

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

@@ -4,7 +4,7 @@
 > 该组件从API Version 6开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。
 
 ## 导入模块
-```
+```js
 import mediaLibrary from '@ohos.multimedia.mediaLibrary';
 ```
 
@@ -32,17 +32,18 @@ getMediaLibrary(context: Context): MediaLibrary
 
 **示例：（从API Version 9开始）**
 
-```
-var media = mediaLibrary.getMediaLibrary(this.context);
+```ts
+const context = getContext(this);
+let media = mediaLibrary.getMediaLibrary(context);
 ```
 
 **示例：（API Version 8）**
 
-```
+```js
 import featureAbility from '@ohos.ability.featureAbility';
 
-var context = featureAbility.getContext()
-var media = mediaLibrary.getMediaLibrary(context);
+let context = featureAbility.getContext();
+let media = mediaLibrary.getMediaLibrary(context);
 ```
 ## mediaLibrary.getMediaLibrary
 
@@ -65,7 +66,7 @@ getMediaLibrary(): MediaLibrary
 **示例：**
 
 ```js
-var media = mediaLibrary.getMediaLibrary();
+let media = mediaLibrary.getMediaLibrary();
 ```
 
 ## MediaLibrary
@@ -90,9 +91,9 @@ getFileAssets(options: MediaFetchOptions, callback: AsyncCallback<FetchFileRe
 
 **示例：**
 
-```
-let fileKeyObj = mediaLibrary.FileKey
-let imageType = mediaLibrary.MediaType.IMAGE
+```js
+let fileKeyObj = mediaLibrary.FileKey;
+let imageType = mediaLibrary.MediaType.IMAGE;
 let imagesfetchOp = {
     selections: fileKeyObj.MEDIA_TYPE + '= ?',
     selectionArgs: [imageType.toString()],
@@ -100,13 +101,15 @@ let imagesfetchOp = {
 media.getFileAssets(imagesfetchOp, (error, fetchFileResult) => {
     if (fetchFileResult != undefined) {
         console.info('mediaLibraryTest : ASSET_CALLBACK fetchFileResult success');
-        fetchFileResult.getAllObject((err, fileAssetList) => {
-            if (fileAssetList != undefined) {
-                fileAssetList.forEach(function(getAllObjectInfo){
-                    console.info("getAllObjectInfo.displayName :" + getAllObjectInfo.displayName);
-                });
+        for (let i = 0; i < fetchFileResult.getCount(); i++) {
+            fetchFileResult.getNextObject((err, fileAsset) => {
+            if (err) {
+                console.error('Failed ');
+                return;
             }
-    	});
+            console.log('fileAsset.displayName ' + i + ': ' + fileAsset.displayName);
+            })
+        } 
     }
 });
 ```
@@ -134,9 +137,9 @@ getFileAssets(options: MediaFetchOptions): Promise&lt;FetchFileResult&gt;
 
 **示例：**
 
-```
-let fileKeyObj = mediaLibrary.FileKey
-let imageType = mediaLibrary.MediaType.IMAGE
+```js
+let fileKeyObj = mediaLibrary.FileKey;
+let imageType = mediaLibrary.MediaType.IMAGE;
 let imagesfetchOp = {
     selections: fileKeyObj.MEDIA_TYPE + '= ?',
     selectionArgs: [imageType.toString()],
@@ -165,7 +168,7 @@ on(type: 'deviceChange'|'albumChange'|'imageChange'|'audioChange'|'videoChange'|
 
 **示例：**
 
-```
+```js
 media.on('imageChange', () => {
     // image file had changed, do something
 })
@@ -187,13 +190,13 @@ off(type: 'deviceChange'|'albumChange'|'imageChange'|'audioChange'|'videoChange'
 
 **示例：**
 
-```
+```js
 media.off('imageChange', () => {
     // stop listening success
 })
 ```
 
-### createAsset <sup>8+</sup>
+### createAsset<sup>8+</sup>
 
 createAsset(mediaType: MediaType, displayName: string, relativePath: string, callback: AsyncCallback&lt;FileAsset&gt;): void
 
@@ -214,7 +217,7 @@ createAsset(mediaType: MediaType, displayName: string, relativePath: string, cal
 
 **示例：**
 
-```
+```js
 async function example() {
     // 使用Callback方式创建Image类型文件
     let mediaType = mediaLibrary.MediaType.IMAGE;
@@ -256,16 +259,106 @@ createAsset(mediaType: MediaType, displayName: string, relativePath: string): Pr
 
 **示例：**
 
+```js
+let DIR_CAMERA = mediaLibrary.DirectoryType.DIR_CAMERA;
+media.getPublicDirectory(DIR_CAMERA).then(function(dicResult){
+    console.info("getPublicDirectory successfully:"+ JSON.stringify(dicResult));
+}).catch(function(err){
+    console.info("getPublicDirectory failed with error:"+ err);
+});
+```
+
+### deleteAsset<sup>8+</sup>
+
+deleteAsset(uri: string): Promise\<void>
+
+删除媒体文件资源
+
+**系统接口**：此接口为系统接口。
+
+**需要权限**：ohos.permission.READ_MEDIA and ohos.permission.WRITE_MEDIA
+
+**系统能力**：SystemCapability.Multimedia.MediaLibrary.Core
+
+**参数：**
+
+| 参数名      | 类型                           | 必填   | 说明              |
+| -------- | ---------------------------- | ---- | --------------- |
+| uri | string | 是    | 需要删除的媒体文件资源的uri |
+
+**返回值：**
+| 类型                  | 说明                   |
+| ------------------- | -------------------- |
+| Promise&lt;void&gt; | Promise回调返回删除的结果。 |
+
+**示例：**
+
+```js
+async function example() {
+    let fileKeyObj = mediaLibrary.FileKey;
+    let fileType = mediaLibrary.MediaType.FILE;
+    let option = {
+        selections: fileKeyObj.MEDIA_TYPE + '= ?',
+        selectionArgs: [fileType.toString()],
+    };
+    const context = getContext(this);
+    var media = mediaLibrary.getMediaLibrary(context);
+    const fetchFileResult = await media.getFileAssets(option);
+    let asset = await fetchFileResult.getFirstObject();
+    if (asset == undefined) {
+        console.error('asset not exist')
+        return
+    }
+    media.deleteAsset(asset.uri).then(() => {
+        console.info("deleteAsset successfully");
+    }).catch((err) => {
+        console.info("deleteAsset failed with error:"+ err);
+    });
+}
 ```
+
+### deleteAsset<sup>8+</sup>
+deleteAsset(uri: string, callback: AsyncCallback\<void>): void
+
+删除媒体文件资源
+
+**系统接口**：此接口为系统接口。
+
+**需要权限**：ohos.permission.READ_MEDIA and ohos.permission.WRITE_MEDIA
+
+**系统能力**：SystemCapability.Multimedia.MediaLibrary.Core
+
+**参数：**
+
+| 参数名      | 类型                           | 必填   | 说明              |
+| -------- | ---------------------------- | ---- | --------------- |
+| uri | string | 是    | 需要删除的媒体文件资源的uri。 |
+|callback |AsyncCallback\<void>| 是  |回调函数，用于获取删除的结果。|
+
+**示例：**
+
+```js
 async function example() {
-    // 使用Promise方式创建Image类型文件
-    let mediaType = mediaLibrary.MediaType.IMAGE;
-    let DIR_IMAGE = mediaLibrary.DirectoryType.DIR_IMAGE;
-    const path = await media.getPublicDirectory(DIR_IMAGE);
-    media.createAsset(mediaType, "image01.jpg", path + 'myPicture/').then (function (asset) {
-        console.info("createAsset successfully:"+ JSON.stringify(asset));
-    }).catch(function(err){
-        console.info("createAsset failed with error:"+ err);
+    let fileKeyObj = mediaLibrary.FileKey;
+    let fileType = mediaLibrary.MediaType.FILE;
+    let option = {
+        selections: fileKeyObj.MEDIA_TYPE + '= ?',
+        selectionArgs: [fileType.toString()],
+    };
+    const context = getContext(this);
+    var media = mediaLibrary.getMediaLibrary(context);
+    const fetchFileResult = await media.getFileAssets(option);
+    let asset = await fetchFileResult.getFirstObject();
+    if (asset == undefined) {
+        console.error('asset not exist')
+        return
+    }
+    media.deleteAsset(asset.uri, (err) => {
+        if (err != undefined) {
+            console.info("deleteAsset successfully");
+        } else {
+            console.info("deleteAsset failed with error:"+ err);
+        }
     });
 }
 ```
@@ -287,7 +380,7 @@ getPublicDirectory(type: DirectoryType, callback: AsyncCallback&lt;string&gt;):
 
 **示例：**
 
-```
+```js
 let DIR_CAMERA = mediaLibrary.DirectoryType.DIR_CAMERA;
 media.getPublicDirectory(DIR_CAMERA, (err, dicResult) => {
     if (dicResult == 'Camera/') {
@@ -320,7 +413,7 @@ getPublicDirectory(type: DirectoryType): Promise&lt;string&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let DIR_CAMERA = mediaLibrary.DirectoryType.DIR_CAMERA;
     const dicResult = await media.getPublicDirectory(DIR_CAMERA);
@@ -351,7 +444,7 @@ getAlbums(options: MediaFetchOptions, callback: AsyncCallback<Array&lt;Album&gt;
 
 **示例：**
 
-```
+```js
 let AlbumNoArgsfetchOp = {
     selections: '',
     selectionArgs: [],
@@ -391,7 +484,7 @@ getAlbums(options: MediaFetchOptions): Promise<Array&lt;Album&gt;>
 
 **示例：**
 
-```
+```js
 let AlbumNoArgsfetchOp = {
     selections: '',
     selectionArgs: [],
@@ -420,7 +513,7 @@ release(callback: AsyncCallback&lt;void&gt;): void
 
 **示例：**
 
-```
+```js
 var media = mediaLibrary.getMediaLibrary(context);
 media.release((err) => {
     // do something
@@ -444,7 +537,7 @@ release(): Promise&lt;void&gt;
 
 **示例：**
 
-```
+```js
 media.release()
 ```
 
@@ -467,7 +560,7 @@ storeMediaAsset(option: MediaAssetOption, callback: AsyncCallback&lt;string&gt;)
 
 **示例：**
 
-  ```
+```js
 let option = {
     src : "/data/storage/el2/base/haps/entry/image.png",
     mimeType : "image/*",
@@ -481,7 +574,7 @@ mediaLibrary.getMediaLibrary().storeMediaAsset(option, (err, value) => {
     console.log("Media resources stored. ");
     // Obtain the URI that stores media resources.
 });
-  ```
+```
 
 
 ### storeMediaAsset<sup>(deprecated)</sup>
@@ -508,7 +601,7 @@ storeMediaAsset(option: MediaAssetOption): Promise&lt;string&gt;
 
 **示例：**
 
-  ```
+```js
 let option = {
     src : "/data/storage/el2/base/haps/entry/image.png",
     mimeType : "image/*",
@@ -520,7 +613,7 @@ mediaLibrary.getMediaLibrary().storeMediaAsset(option).then((value) => {
 }).catch((err) => {
     console.log("An error occurred when storing media resources.");
 });
-  ```
+```
 
 
 ### startImagePreview<sup>(deprecated)</sup>
@@ -543,7 +636,7 @@ startImagePreview(images: Array&lt;string&gt;, index: number, callback: AsyncCal
 
 **示例：**
 
-  ```
+```js
 let images = [
     "dataability:///media/xxxx/2",
     "dataability:///media/xxxx/3"
@@ -562,7 +655,7 @@ mediaLibrary.getMediaLibrary().startImagePreview(images, index, (err) => {
     }
     console.log("Succeeded in previewing the images.");
 });
-  ```
+```
 
 
 ### startImagePreview<sup>(deprecated)</sup>
@@ -584,7 +677,7 @@ startImagePreview(images: Array&lt;string&gt;, callback: AsyncCallback&lt;void&g
 
 **示例：**
 
-  ```
+```js
 let images = [
     "dataability:///media/xxxx/2",
     "dataability:///media/xxxx/3"
@@ -602,7 +695,7 @@ mediaLibrary.getMediaLibrary().startImagePreview(images, (err) => {
     }
     console.log("Succeeded in previewing the images.");
 });
-  ```
+```
 
 
 ### startImagePreview<sup>(deprecated)</sup>
@@ -630,7 +723,7 @@ startImagePreview(images: Array&lt;string&gt;, index?: number): Promise&lt;void&
 
 **示例：**
 
-  ```
+```js
 let images = [
     "dataability:///media/xxxx/2",
     "dataability:///media/xxxx/3"
@@ -647,7 +740,7 @@ mediaLibrary.getMediaLibrary().startImagePreview(images, index).then(() => {
 }).catch((err) => {
     console.log("An error occurred when previewing the images.");
 });
-  ```
+```
 
 
 ### startMediaSelect<sup>(deprecated)</sup>
@@ -664,12 +757,12 @@ startMediaSelect(option: MediaSelectOption, callback: AsyncCallback&lt;Array&lt;
 
 | 参数名      | 类型                                       | 必填   | 说明                                   |
 | -------- | ---------------------------------------- | ---- | ------------------------------------ |
-| option   | [MediaSelectOption](#mediaselectoption)  | 是    | 媒体选择选项。                              |
+| option   | [MediaSelectOption](#mediaselectoptiondeprecated)  | 是    | 媒体选择选项。                              |
 | callback | AsyncCallback&lt;Array&lt;string&gt;&gt; | 是    | 媒体选择回调，返回选择的媒体URI（dataability://）列表。 |
 
 **示例：**
 
-  ```
+```js
 let option = {
     type : "media",
     count : 2
@@ -682,7 +775,7 @@ mediaLibrary.getMediaLibrary().startMediaSelect(option, (err, value) => {
     console.log("Media resources selected.");
     // Obtain the media selection value.
 });
-  ```
+```
 
 
 ### startMediaSelect<sup>(deprecated)</sup>
@@ -699,7 +792,7 @@ startMediaSelect(option: MediaSelectOption): Promise&lt;Array&lt;string&gt;&gt;
 
 | 参数名    | 类型                                      | 必填   | 说明      |
 | ------ | --------------------------------------- | ---- | ------- |
-| option | [MediaSelectOption](#mediaselectoption) | 是    | 媒体选择选项。 |
+| option | [MediaSelectOption](#mediaselectoptiondeprecated) | 是    | 媒体选择选项。 |
 
 **返回值：**
 
@@ -709,7 +802,7 @@ startMediaSelect(option: MediaSelectOption): Promise&lt;Array&lt;string&gt;&gt;
 
 **示例：**
 
-  ```
+```js
 let option = {
     type : "media",
     count : 2
@@ -721,7 +814,155 @@ mediaLibrary.getMediaLibrary().startMediaSelect(option).then((value) => {
     console.log("An error occurred when selecting media resources.");
 });
 
-  ```
+```
+### getActivePeers<sup>8+</sup>
+
+getActivePeers(): Promise\<Array\<PeerInfo>>;
+
+获取在线对端设备的信息，使用Promise方式返回异步结果
+
+**系统接口**：此接口为系统接口。
+
+**需要权限**：ohos.permission.READ_MEDIA
+
+**系统能力**：SystemCapability.Multimedia.MediaLibrary.DistributedCore
+
+**返回值：**
+
+| 类型                  | 说明                   |
+| ------------------- | -------------------- |
+|  Promise\<Array\<PeerInfo>> | 返回获取的所有在线对端设备的PeerInfo |
+
+**示例：**
+
+```js
+async function example() {
+    const context = getContext(this);
+    var media = mediaLibrary.getMediaLibrary(context);
+    media.getActivePeers().then((devicesInfo) => {
+        if (devicesInfo != undefined) {
+            for (let i = 0; i < devicesInfo.length; i++) {
+            console.info('get distributed info ' + devicesInfo[i].deviceName + devicesInfo[i].networkId);
+            }
+        } else {
+            console.info('get distributed info is undefined!')
+        }
+    }).catch((err) => {
+        console.info("get distributed info failed with error:" + err);
+    });
+}
+```
+
+### getActivePeers<sup>8+</sup>
+
+getActivePeers(callback: AsyncCallback\<Array\<PeerInfo>>): void;
+
+获取在线对端设备的信息，使用callback方式返回异步结果。
+
+**系统接口**：此接口为系统接口。
+
+**需要权限**：ohos.permission.READ_MEDIA
+
+**系统能力**：SystemCapability.Multimedia.MediaLibrary.DistributedCore
+
+**返回值：**
+
+| 类型                  | 说明                   |
+| ------------------- | -------------------- |
+| callback: AsyncCallback\<Array\<PeerInfo>> | 返回获取的所有在线对端设备的PeerInfo |
+
+**示例：**
+
+```js
+async function example() {
+    const context = getContext(this);
+    var media = mediaLibrary.getMediaLibrary(context);
+    media.getActivePeers((err, devicesInfo) => {
+        if (devicesInfo != undefined) {
+            for (let i = 0; i < devicesInfo.length; i++) {
+                console.info('get distributed info ' + devicesInfo[i].deviceName + devicesInfo[i].networkId);
+            }
+        } else {
+            console.info('get distributed fail, message = ' + err)
+        }
+    })
+}
+```
+
+
+### getAllPeers<sup>8+</sup>
+
+getAllPeers(): Promise\<Array\<PeerInfo>>;
+
+获取所有对端设备的信息，使用Promise方式返回异步结果
+
+**系统接口**：此接口为系统接口。
+
+**需要权限**：ohos.permission.READ_MEDIA
+
+**系统能力**：SystemCapability.Multimedia.MediaLibrary.DistributedCore
+
+**返回值：**
+
+| 类型                  | 说明                   |
+| ------------------- | -------------------- |
+|  Promise\<Array\<PeerInfo>> | 返回获取的所有对端设备的PeerInfo |
+
+**示例：**
+
+```js
+async function example() {
+    const context = getContext(this);
+    var media = mediaLibrary.getMediaLibrary(context);
+    media.getAllPeers().then((devicesInfo) => {
+        if (devicesInfo != undefined) {
+            for (let i = 0; i < devicesInfo.length; i++) {
+                console.info('get distributed info ' + devicesInfo[i].deviceName + devicesInfo[i].networkId);
+            }
+        } else {
+            console.info('get distributed info is undefined!')
+        }
+    }).catch((err) => {
+        console.info("get distributed info failed with error:" + err);
+    });
+}
+```
+
+### getAllPeers<sup>8+</sup>
+
+getAllPeers(callback: AsyncCallback\<Array\<PeerInfo>>): void;
+
+获取所有对端设备的信息，使用callback方式返回异步结果。
+
+**系统接口**：此接口为系统接口。
+
+**需要权限**：ohos.permission.READ_MEDIA
+
+**系统能力**：SystemCapability.Multimedia.MediaLibrary.DistributedCore
+
+**返回值：**
+
+| 类型                  | 说明                   |
+| ------------------- | -------------------- |
+| callback: AsyncCallback\<Array\<PeerInfo>> | 返回获取的所有对端设备的PeerInfo |
+
+**示例：**
+
+```js
+async function example() {
+    const context = getContext(this);
+    var media = mediaLibrary.getMediaLibrary(context);
+    media.getAllPeers((err, devicesInfo) => {
+        if (devicesInfo != undefined) {
+            for (let i = 0; i < devicesInfo.length; i++) {
+            console.info('get distributed info ' + devicesInfo[i].deviceName + devicesInfo[i].networkId);
+            }
+        } else {
+            console.info('get distributed fail, message = ' + err)
+        }
+    })
+}
+```
 
 ## FileAsset<sup>7+</sup>
 
@@ -774,7 +1015,7 @@ isDirectory(callback: AsyncCallback&lt;boolean&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -810,7 +1051,7 @@ isDirectory():Promise&lt;boolean&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -848,7 +1089,7 @@ commitModify(callback: AsyncCallback&lt;void&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -885,7 +1126,7 @@ commitModify(): Promise&lt;void&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -923,7 +1164,7 @@ open(mode: string, callback: AsyncCallback&lt;number&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let mediaType = mediaLibrary.MediaType.IMAGE;
     let DIR_IMAGE = mediaLibrary.DirectoryType.DIR_IMAGE;
@@ -965,7 +1206,7 @@ open(mode: string): Promise&lt;number&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let mediaType = mediaLibrary.MediaType.IMAGE;
     let DIR_IMAGE = mediaLibrary.DirectoryType.DIR_IMAGE;
@@ -1000,7 +1241,7 @@ close(fd: number, callback: AsyncCallback&lt;void&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1053,7 +1294,7 @@ close(fd: number): Promise&lt;void&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1101,7 +1342,7 @@ getThumbnail(callback: AsyncCallback&lt;image.PixelMap&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1138,9 +1379,9 @@ getThumbnail(size: Size, callback: AsyncCallback&lt;image.PixelMap&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1181,9 +1422,9 @@ getThumbnail(size?: Size): Promise&lt;image.PixelMap&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
         selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1223,9 +1464,9 @@ favorite(isFavorite: boolean, callback: AsyncCallback&lt;void&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1265,9 +1506,9 @@ favorite(isFavorite: boolean): Promise&lt;void&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1303,9 +1544,9 @@ isFavorite(callback: AsyncCallback&lt;boolean&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1343,9 +1584,9 @@ isFavorite():Promise&lt;boolean&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1384,9 +1625,9 @@ trash(isTrash: boolean, callback: AsyncCallback&lt;void&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1429,9 +1670,9 @@ trash(isTrash: boolean): Promise&lt;void&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1467,9 +1708,9 @@ isTrash(callback: AsyncCallback&lt;boolean&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1512,9 +1753,9 @@ isTrash():Promise&lt;boolean&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1552,9 +1793,9 @@ getCount(): number
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let fileType = mediaLibrary.MediaType.FILE;
     let getFileCountOneOp = {
         selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1583,9 +1824,9 @@ isAfterLast(): boolean
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1621,9 +1862,9 @@ close(): void
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1652,9 +1893,9 @@ getFirstObject(callback: AsyncCallback&lt;FileAsset&gt;): void
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1689,9 +1930,9 @@ getFirstObject(): Promise&lt;FileAsset&gt;
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1724,9 +1965,9 @@ async function example() {
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1761,9 +2002,9 @@ async function example() {
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1794,9 +2035,9 @@ getLastObject(callback: AsyncCallback&lt;FileAsset&gt;): void
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1831,9 +2072,9 @@ getLastObject(): Promise&lt;FileAsset&gt;
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1863,9 +2104,9 @@ getPositionObject(index: number, callback: AsyncCallback&lt;FileAsset&gt;): void
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1906,9 +2147,9 @@ getPositionObject(index: number): Promise&lt;FileAsset&gt;
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1918,9 +2159,9 @@ async function example() {
     };
     let fetchFileResult = await media.getFileAssets(getImageOp);
     fetchFileResult.getPositionObject(1) .then(function (fileAsset){
-        console.log('[Demo] fileAsset.displayName : ' + fileAsset.displayName);
+        console.log('fileAsset.displayName : ' + fileAsset.displayName);
     }).catch(function (err) {
-        console.info("[Demo] getFileAssets failed with error:" + err);
+        console.info("getFileAssets failed with error:" + err);
     });
 }
 ```
@@ -1941,9 +2182,9 @@ getAllObject(callback: AsyncCallback&lt;Array&lt;FileAsset&gt;&gt;): void
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -1978,9 +2219,9 @@ getAllObject(): Promise&lt;Array&lt;FileAsset&gt;&gt;
 
 **示例**：
 
-```
+```js
 async function example() {
-    let fileKeyObj = mediaLibrary.FileKey
+    let fileKeyObj = mediaLibrary.FileKey;
     let imageType = mediaLibrary.MediaType.IMAGE;
     let getImageOp = {
       selections: fileKeyObj.MEDIA_TYPE + '= ?',
@@ -2029,7 +2270,7 @@ commitModify(callback: AsyncCallback&lt;void&gt;): void
 
 **示例**：
 
-```
+```js
 async function example() {
     let AlbumNoArgsfetchOp = {
         selections: '',
@@ -2066,7 +2307,7 @@ commitModify(): Promise&lt;void&gt;
 
 **示例**：
 
-```
+```js
 async function example() {
     let AlbumNoArgsfetchOp = {
         selections: '',
@@ -2102,7 +2343,7 @@ getFileAssets(options: MediaFetchOptions, callback: AsyncCallback&lt;FetchFileRe
 
 **示例**：
 
-```
+```js
 async function example() {
     let AlbumNoArgsfetchOp = {
         selections: '',
@@ -2145,7 +2386,7 @@ async function example() {
 
 **示例**：
 
-```
+```js
 async function example() {
     let AlbumNoArgsfetchOp = {
         selections: '',
@@ -2154,7 +2395,7 @@ async function example() {
     let fileNoArgsfetchOp = {
     selections: '',
     selectionArgs: [],
-    }
+    };
     const albumList = await media.getAlbums(AlbumNoArgsfetchOp);
     const album = albumList[0];
     album.getFileAssets(fileNoArgsfetchOp).then(function(albumFetchFileResult){
@@ -2168,7 +2409,8 @@ async function example() {
 ## PeerInfo<sup>8+</sup>
 
 注册设备的信息。
-此接口为系统接口。
+
+**系统接口**：此接口为系统接口。
 
 **系统能力：** 以下各项对应的系统能力均为SystemCapability.Multimedia.MediaLibrary.DistributedCore
 
@@ -2240,7 +2482,8 @@ async function example() {
 ## DeviceType<sup>8+</sup>
 
 枚举，设备类型。
-此接口为系统接口。
+
+**系统接口**：此接口为系统接口。
 
 **系统能力：** 以下各项对应的系统能力均为SystemCapability.Multimedia.MediaLibrary.DistributedCore
 
@@ -2262,7 +2505,7 @@ async function example() {
 
 | 名称                    | 类型                | 可读 | 可写 | 必填 | 说明                                                         |
 | ----------------------- | ------------------- | ---- | ---- | ---- | ------------------------------------------------------------ |
-| selections              | string              | 是   | 是   | 是   | 检索条件，使用[FileKey](#filekey8)中的枚举值作为检索条件的列名。示例：<br />selections: mediaLibrary.FileKey.MEDIA_TYPE + '= ? OR' +mediaLibrary.FileKey.MEDIA_TYPE + '= ?‘, |
+| selections              | string              | 是   | 是   | 是   | 检索条件，使用[FileKey](#filekey8)中的枚举值作为检索条件的列名。示例：<br />selections: mediaLibrary.FileKey.MEDIA_TYPE + '= ? OR ' +mediaLibrary.FileKey.MEDIA_TYPE + '= ?', |
 | selectionArgs           | Array&lt;string&gt; | 是   | 是   | 是   | 检索条件的值，对应selections中检索条件列的值。<br />示例：<br />selectionArgs: [mediaLibrary.MediaType.IMAGE.toString(), mediaLibrary.MediaType.VIDEO.toString()], |
 | order                   | string              | 是   | 是   | 否   | 检索结果排序方式，使用[FileKey](#filekey8)中的枚举值作为检索结果排序的列，可以用升序或降序排列。示例：<br />升序排列：order: mediaLibrary.FileKey.DATE_ADDED + " ASC"<br />降序排列：order: mediaLibrary.FileKey.DATE_ADDED + " DESC" |
 | uri<sup>8+</sup>        | string              | 是   | 是   | 否   | 文件URI                                                      |
@@ -2272,7 +2515,8 @@ async function example() {
 ## Size<sup>8+</sup>
 
 图片尺寸。
-系统能力： 以下各项对应的系统能力均为SystemCapability.Multimedia.MediaLibrary.Core
+
+**系统能力：**  以下各项对应的系统能力均为SystemCapability.Multimedia.MediaLibrary.Core
 
 | 名称     | 类型     | 可读   | 可写   | 说明       |
 | ------ | ------ | ---- | ---- | -------- |
@@ -2307,3 +2551,5 @@ async function example() {
 | type  | string | 是    | 媒体类型，包括：image, video, media，当前仅支持media类型 |
 | count | number | 是    | 媒体选择，count = 1表示单选，count大于1表示多选。            |
 
+
+