modified js-apis-medialibrary.md describe the error

Signed-off-by: Nzhang-daiyue <zhangdaiyue1@huawei.com>
Change-Id: I611762fcf1ecc17587383d0130815a2a23d76ef5

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';
 ```
 
@@ -32,13 +32,13 @@ getMediaLibrary(context: Context): MediaLibrary
 
 **示例：（从API Version 9开始）**
 
-```
+```ts
 var media = mediaLibrary.getMediaLibrary(this.context);
 ```
 
 **示例：（API Version 8）**
 
-```
+```js
 import featureAbility from '@ohos.ability.featureAbility';
 
 var context = featureAbility.getContext()
@@ -90,7 +90,7 @@ getFileAssets(options: MediaFetchOptions, callback: AsyncCallback<FetchFileRe
 
 **示例：**
 
-```
+```js
 let fileKeyObj = mediaLibrary.FileKey
 let imageType = mediaLibrary.MediaType.IMAGE
 let imagesfetchOp = {
@@ -134,7 +134,7 @@ getFileAssets(options: MediaFetchOptions): Promise<FetchFileResult>
 
 **示例：**
 
-```
+```js
 let fileKeyObj = mediaLibrary.FileKey
 let imageType = mediaLibrary.MediaType.IMAGE
 let imagesfetchOp = {
@@ -165,7 +165,7 @@ on(type: 'deviceChange'|'albumChange'|'imageChange'|'audioChange'|'videoChange'|
 
 **示例：**
 
-```
+```js
 media.on('imageChange', () => {
     // image file had changed, do something
 })
@@ -187,7 +187,7 @@ off(type: 'deviceChange'|'albumChange'|'imageChange'|'audioChange'|'videoChange'
 
 **示例：**
 
-```
+```js
 media.off('imageChange', () => {
     // stop listening success
 })
@@ -214,7 +214,7 @@ 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;
@@ -256,7 +256,7 @@ 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));
@@ -282,7 +282,7 @@ getPublicDirectory(type: DirectoryType, callback: AsyncCallback<string>):
 
 **示例：**
 
-```
+```js
 let DIR_CAMERA = mediaLibrary.DirectoryType.DIR_CAMERA;
 media.getPublicDirectory(DIR_CAMERA, (err, dicResult) => {
     if (dicResult == 'Camera/') {
@@ -315,7 +315,7 @@ getPublicDirectory(type: DirectoryType): Promise<string>
 
 **示例：**
 
-```
+```js
 async function example() {
     let DIR_CAMERA = mediaLibrary.DirectoryType.DIR_CAMERA;
     const dicResult = await media.getPublicDirectory(DIR_CAMERA);
@@ -346,7 +346,7 @@ getAlbums(options: MediaFetchOptions, callback: AsyncCallback<Array&lt;Album&gt;
 
 **示例：**
 
-```
+```js
 let AlbumNoArgsfetchOp = {
     selections: '',
     selectionArgs: [],
@@ -386,7 +386,7 @@ getAlbums(options: MediaFetchOptions): Promise<Array&lt;Album&gt;>
 
 **示例：**
 
-```
+```js
 let AlbumNoArgsfetchOp = {
     selections: '',
     selectionArgs: [],
@@ -415,7 +415,7 @@ release(callback: AsyncCallback&lt;void&gt;): void
 
 **示例：**
 
-```
+```js
 var media = mediaLibrary.getMediaLibrary(context);
 media.release((err) => {
     // do something
@@ -439,7 +439,7 @@ release(): Promise&lt;void&gt;
 
 **示例：**
 
-```
+```js
 media.release()
 ```
 
@@ -462,7 +462,7 @@ storeMediaAsset(option: MediaAssetOption, callback: AsyncCallback&lt;string&gt;)
 
 **示例：**
 
-  ```
+```js
 let option = {
     src : "/data/storage/el2/base/haps/entry/image.png",
     mimeType : "image/*",
@@ -476,7 +476,7 @@ mediaLibrary.getMediaLibrary().storeMediaAsset(option, (err, value) => {
     console.log("Media resources stored. ");
     // Obtain the URI that stores media resources.
 });
-  ```
+```
 
 
 ### storeMediaAsset<sup>(deprecated)</sup>
@@ -503,7 +503,7 @@ storeMediaAsset(option: MediaAssetOption): Promise&lt;string&gt;
 
 **示例：**
 
-  ```
+```js
 let option = {
     src : "/data/storage/el2/base/haps/entry/image.png",
     mimeType : "image/*",
@@ -515,7 +515,7 @@ mediaLibrary.getMediaLibrary().storeMediaAsset(option).then((value) => {
 }).catch((err) => {
     console.log("An error occurred when storing media resources.");
 });
-  ```
+```
 
 
 ### startImagePreview<sup>(deprecated)</sup>
@@ -538,7 +538,7 @@ startImagePreview(images: Array&lt;string&gt;, index: number, callback: AsyncCal
 
 **示例：**
 
-  ```
+```js
 let images = [
     "dataability:///media/xxxx/2",
     "dataability:///media/xxxx/3"
@@ -557,7 +557,7 @@ mediaLibrary.getMediaLibrary().startImagePreview(images, index, (err) => {
     }
     console.log("Succeeded in previewing the images.");
 });
-  ```
+```
 
 
 ### startImagePreview<sup>(deprecated)</sup>
@@ -579,7 +579,7 @@ startImagePreview(images: Array&lt;string&gt;, callback: AsyncCallback&lt;void&g
 
 **示例：**
 
-  ```
+```js
 let images = [
     "dataability:///media/xxxx/2",
     "dataability:///media/xxxx/3"
@@ -597,7 +597,7 @@ mediaLibrary.getMediaLibrary().startImagePreview(images, (err) => {
     }
     console.log("Succeeded in previewing the images.");
 });
-  ```
+```
 
 
 ### startImagePreview<sup>(deprecated)</sup>
@@ -625,7 +625,7 @@ startImagePreview(images: Array&lt;string&gt;, index?: number): Promise&lt;void&
 
 **示例：**
 
-  ```
+```js
 let images = [
     "dataability:///media/xxxx/2",
     "dataability:///media/xxxx/3"
@@ -642,7 +642,7 @@ mediaLibrary.getMediaLibrary().startImagePreview(images, index).then(() => {
 }).catch((err) => {
     console.log("An error occurred when previewing the images.");
 });
-  ```
+```
 
 
 ### startMediaSelect<sup>(deprecated)</sup>
@@ -664,7 +664,7 @@ startMediaSelect(option: MediaSelectOption, callback: AsyncCallback&lt;Array&lt;
 
 **示例：**
 
-  ```
+```js
 let option = {
     type : "media",
     count : 2
@@ -677,7 +677,7 @@ mediaLibrary.getMediaLibrary().startMediaSelect(option, (err, value) => {
     console.log("Media resources selected.");
     // Obtain the media selection value.
 });
-  ```
+```
 
 
 ### startMediaSelect<sup>(deprecated)</sup>
@@ -704,7 +704,7 @@ startMediaSelect(option: MediaSelectOption): Promise&lt;Array&lt;string&gt;&gt;
 
 **示例：**
 
-  ```
+```js
 let option = {
     type : "media",
     count : 2
@@ -716,7 +716,7 @@ mediaLibrary.getMediaLibrary().startMediaSelect(option).then((value) => {
     console.log("An error occurred when selecting media resources.");
 });
 
-  ```
+```
 
 ## FileAsset<sup>7+</sup>
 
@@ -769,7 +769,7 @@ isDirectory(callback: AsyncCallback&lt;boolean&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -805,7 +805,7 @@ isDirectory():Promise&lt;boolean&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -843,7 +843,7 @@ commitModify(callback: AsyncCallback&lt;void&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -880,7 +880,7 @@ commitModify(): Promise&lt;void&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -918,7 +918,7 @@ 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;
@@ -960,7 +960,7 @@ 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;
@@ -995,7 +995,7 @@ close(fd: number, callback: AsyncCallback&lt;void&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1048,7 +1048,7 @@ close(fd: number): Promise&lt;void&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1096,7 +1096,7 @@ getThumbnail(callback: AsyncCallback&lt;image.PixelMap&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1133,7 +1133,7 @@ getThumbnail(size: Size, callback: AsyncCallback&lt;image.PixelMap&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1176,7 +1176,7 @@ getThumbnail(size?: Size): Promise&lt;image.PixelMap&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1218,7 +1218,7 @@ favorite(isFavorite: boolean, callback: AsyncCallback&lt;void&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1260,7 +1260,7 @@ favorite(isFavorite: boolean): Promise&lt;void&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1298,7 +1298,7 @@ isFavorite(callback: AsyncCallback&lt;boolean&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1338,7 +1338,7 @@ isFavorite():Promise&lt;boolean&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1379,7 +1379,7 @@ trash(isTrash: boolean, callback: AsyncCallback&lt;void&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1424,7 +1424,7 @@ trash(isTrash: boolean): Promise&lt;void&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1462,7 +1462,7 @@ isTrash(callback: AsyncCallback&lt;boolean&gt;): void
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1507,7 +1507,7 @@ isTrash():Promise&lt;boolean&gt;
 
 **示例：**
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1527,6 +1527,239 @@ async function example() {
 }
 ```
 
+### 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 |
+
+**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(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 |
+
+**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, (err) => {
+        if (err != undefined) {
+            console.info("deleteAsset successfully");
+        } else {
+            console.info("deleteAsset failed with error:"+ err);
+        }
+    });
+}
+```
+
+### 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(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(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)
+        }
+    })
+}
+```
+
 ## FetchFileResult<sup>7+</sup>
 
 文件检索结果集。
@@ -1547,7 +1780,7 @@ getCount(): number
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let fileType = mediaLibrary.MediaType.FILE;
@@ -1578,7 +1811,7 @@ isAfterLast(): boolean
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1616,7 +1849,7 @@ close(): void
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1647,7 +1880,7 @@ getFirstObject(callback: AsyncCallback&lt;FileAsset&gt;): void
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1684,7 +1917,7 @@ getFirstObject(): Promise&lt;FileAsset&gt;
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1719,7 +1952,7 @@ async function example() {
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1756,7 +1989,7 @@ async function example() {
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1789,7 +2022,7 @@ getLastObject(callback: AsyncCallback&lt;FileAsset&gt;): void
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1826,7 +2059,7 @@ getLastObject(): Promise&lt;FileAsset&gt;
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1858,7 +2091,7 @@ getPositionObject(index: number, callback: AsyncCallback&lt;FileAsset&gt;): void
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1901,7 +2134,7 @@ getPositionObject(index: number): Promise&lt;FileAsset&gt;
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1913,9 +2146,9 @@ 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);
     });
 }
 ```
@@ -1936,7 +2169,7 @@ getAllObject(callback: AsyncCallback&lt;Array&lt;FileAsset&gt;&gt;): void
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -1973,7 +2206,7 @@ getAllObject(): Promise&lt;Array&lt;FileAsset&gt;&gt;
 
 **示例**：
 
-```
+```js
 async function example() {
     let fileKeyObj = mediaLibrary.FileKey
     let imageType = mediaLibrary.MediaType.IMAGE;
@@ -2024,7 +2257,7 @@ commitModify(callback: AsyncCallback&lt;void&gt;): void
 
 **示例**：
 
-```
+```js
 async function example() {
     let AlbumNoArgsfetchOp = {
         selections: '',
@@ -2061,7 +2294,7 @@ commitModify(): Promise&lt;void&gt;
 
 **示例**：
 
-```
+```js
 async function example() {
     let AlbumNoArgsfetchOp = {
         selections: '',
@@ -2097,7 +2330,7 @@ getFileAssets(options: MediaFetchOptions, callback: AsyncCallback&lt;FetchFileRe
 
 **示例**：
 
-```
+```js
 async function example() {
     let AlbumNoArgsfetchOp = {
         selections: '',
@@ -2140,7 +2373,7 @@ async function example() {
 
 **示例**：
 
-```
+```js
 async function example() {
     let AlbumNoArgsfetchOp = {
         selections: '',
@@ -2163,7 +2396,8 @@ 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
 
@@ -2235,7 +2469,8 @@ 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
 
@@ -2267,7 +2502,8 @@ 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       |
 | ------ | ------ | ---- | ---- | -------- |
@@ -2302,3 +2538,4 @@ 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。            |
 
+