diff --git a/zh-cn/application-dev/reference/apis/js-apis-media.md b/zh-cn/application-dev/reference/apis/js-apis-media.md
index bb377864a18274fd47c1ed8a52e6cb89861f2db2..8c816b559d8c79eefba7b10b68fef070c0a57c5d 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-media.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-media.md
@@ -45,15 +45,15 @@ createAVPlayer(callback: AsyncCallback\<AVPlayer>): void
 **示例：**
 
 ```js
-let avPlayer
+let avPlayer;
 
 media.createAVPlayer((error, video) => {
-   if (video != null) {
-       avPlayer = video;
-       console.info('createAVPlayer success');
-   } else {
-       console.info(`createAVPlayer fail, error:${error}`);
-   }
+  if (video != null) {
+    avPlayer = video;
+    console.info('createAVPlayer success');
+  } else {
+    console.error(`createAVPlayer fail, error message:${error.message}`);
+  }
 });
 ```
 
@@ -82,17 +82,17 @@ createAVPlayer(): Promise\<AVPlayer>
 **示例：**
 
 ```js
-let avPlayer
+let avPlayer;
 
 media.createAVPlayer().then((video) => {
-    if (video != null) {
-       avPlayer = video;
-       console.info('createAVPlayer success');
-   } else {
-       console.info('createAVPlayer fail');
-   }
+  if (video != null) {
+    avPlayer = video;
+    console.info('createAVPlayer success');
+  } else {
+    console.error('createAVPlayer fail');
+  }
 }).catch((error) => {
-   console.info(`AVPlayer catchCallback, error:${error}`);
+  console.error(`AVPlayer catchCallback, error message:${error.message}`);
 });
 ```
 
@@ -124,15 +124,15 @@ createAVRecorder(callback: AsyncCallback\<AVRecorder>): void
 **示例：**
 
 ```js
-let avRecorder
+let avRecorder;
 
 media.createAVRecorder((error, recorder) => {
-   if (recorder != null) {
-       avRecorder = recorder;
-       console.info('createAVRecorder success');
-   } else {
-       console.info(`createAVRecorder fail, error:${error}`);
-   }
+  if (recorder != null) {
+    avRecorder = recorder;
+    console.info('createAVRecorder success');
+  } else {
+    console.error(`createAVRecorder fail, error message:${error.message}`);
+  }
 });
 ```
 
@@ -164,17 +164,17 @@ createAVRecorder(): Promise\<AVRecorder>
 **示例：**
 
 ```js
-let avRecorder
+let avRecorder;
 
 media.createAVRecorder().then((recorder) => {
-    if (recorder != null) {
-       avRecorder = recorder;
-       console.info('createAVRecorder success');
-   } else {
-       console.info('createAVRecorder fail');
-   }
+  if (recorder != null) {
+    avRecorder = recorder;
+    console.info('createAVRecorder success');
+  } else {
+    console.error('createAVRecorder fail');
+  }
 }).catch((error) => {
-   console.info(`createAVRecorder catchCallback, error:${error}`);
+  console.error(`createAVRecorder catchCallback, error message:${error.message}`);
 });
 ```
 
@@ -206,15 +206,15 @@ createVideoRecorder(callback: AsyncCallback\<VideoRecorder>): void
 **示例：**
 
 ```js
-let videoRecorder
+let videoRecorder;
 
 media.createVideoRecorder((error, video) => {
-   if (video != null) {
-       videoRecorder = video;
-       console.info('video createVideoRecorder success');
-   } else {
-       console.info(`video createVideoRecorder fail, error:${error}`);
-   }
+  if (video != null) {
+    videoRecorder = video;
+    console.info('video createVideoRecorder success');
+  } else {
+    console.error(`video createVideoRecorder fail, error message:${error.message}`);
+  }
 });
 ```
 
@@ -246,17 +246,17 @@ createVideoRecorder(): Promise\<VideoRecorder>
 **示例：**
 
 ```js
-let videoRecorder
+let videoRecorder;
 
 media.createVideoRecorder().then((video) => {
-    if (video != null) {
-       videoRecorder = video;
-       console.info('video createVideoRecorder success');
-   } else {
-       console.info('video createVideoRecorder fail');
-   }
+  if (video != null) {
+    videoRecorder = video;
+    console.info('video createVideoRecorder success');
+  } else {
+    console.error('video createVideoRecorder fail');
+  }
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error message:${error.message}`);
 });
 ```
 
@@ -397,38 +397,38 @@ on(type: 'stateChange', callback: (state: AVPlayerState, reason: StateChangeReas
 
 ```js
 avPlayer.on('stateChange', async (state, reason) => {
-    switch (state) {
-        case 'idle':
-            console.info('state idle called')
-            break;
-        case 'initialized':
-            console.info('initialized prepared called')
-            break;
-        case 'prepared':
-            console.info('state prepared called')
-            break;
-        case 'playing':
-            console.info('state playing called')
-            break;
-        case 'paused':
-            console.info('state paused called')
-            break;
-        case 'completed':
-            console.info('state completed called')
-            break;
-        case 'stopped':
-            console.info('state stopped called')
-            break;
-        case 'released':
-            console.info('state released called')
-            break;
-        case 'error':
-            console.info('state error called')
-            break;
-        default:
-            console.info('unkown state :' + state)
-            break;
-    }
+  switch (state) {
+    case 'idle':
+      console.info('state idle called')
+      break;
+    case 'initialized':
+      console.info('initialized prepared called')
+      break;
+    case 'prepared':
+      console.info('state prepared called')
+      break;
+    case 'playing':
+      console.info('state playing called')
+      break;
+    case 'paused':
+      console.info('state paused called')
+      break;
+    case 'completed':
+      console.info('state completed called')
+      break;
+    case 'stopped':
+      console.info('state stopped called')
+      break;
+    case 'released':
+      console.info('state released called')
+      break;
+    case 'error':
+      console.info('state error called')
+      break;
+    default:
+      console.info('unkown state :' + state)
+      break;
+  }
 })
 ```
 
@@ -485,8 +485,8 @@ AVPlayer回调的**错误分类**<a name = error_info></a>可以分为以下几
 
 ```js
 avPlayer.on('error', (error) => {
-    console.info('error happened,and error message is :' + error.message)
-    console.info('error happened,and error code is :' + error.code)
+  console.error('error happened,and error message is :' + error.message)
+  console.error('error happened,and error code is :' + error.code)
 })
 ```
 
@@ -537,11 +537,11 @@ prepare(callback: AsyncCallback\<void>): void
 
 ```js
 avPlayer.prepare((err) => {
-    if (err == null) {
-        console.info('prepare success');
-    } else {
-        console.error('prepare filed,error message is :' + err.message)
-    }
+  if (err == null) {
+    console.info('prepare success');
+  } else {
+    console.error('prepare filed,error message is :' + err.message)
+  }
 })
 ```
 
@@ -572,9 +572,9 @@ prepare(): Promise\<void>
 
 ```js
 avPlayer.prepare().then(() => {
-    console.info('prepare success');
+  console.info('prepare success');
 }, (err) => {
-    console.error('prepare filed,error message is :' + err.message)
+  console.error('prepare filed,error message is :' + err.message)
 })
 ```
 
@@ -604,11 +604,11 @@ play(callback: AsyncCallback\<void>): void
 
 ```js
 avPlayer.play((err) => {
-    if (err == null) {
-        console.info('play success');
-    } else {
-        console.error('play filed,error message is :' + err.message)
-    }
+  if (err == null) {
+    console.info('play success');
+  } else {
+    console.error('play filed,error message is :' + err.message)
+  }
 })
 ```
 
@@ -638,9 +638,9 @@ play(): Promise\<void>
 
 ```js
 avPlayer.play().then(() => {
-    console.info('play success');
+  console.info('play success');
 }, (err) => {
-    console.error('play filed,error message is :' + err.message)
+  console.error('play filed,error message is :' + err.message)
 })
 ```
 
@@ -670,11 +670,11 @@ pause(callback: AsyncCallback\<void>): void
 
 ```js
 avPlayer.pause((err) => {
-    if (err == null) {
-        console.info('pause success');
-    } else {
-        console.error('pause filed,error message is :' + err.message)
-    }
+  if (err == null) {
+    console.info('pause success');
+  } else {
+    console.error('pause filed,error message is :' + err.message)
+  }
 })
 ```
 
@@ -704,9 +704,9 @@ pause(): Promise\<void>
 
 ```js
 avPlayer.pause().then(() => {
-    console.info('pause success');
+  console.info('pause success');
 }, (err) => {
-    console.error('pause filed,error message is :' + err.message)
+  console.error('pause filed,error message is :' + err.message)
 })
 ```
 
@@ -736,11 +736,11 @@ stop(callback: AsyncCallback\<void>): void
 
 ```js
 avPlayer.stop((err) => {
-    if (err == null) {
-        console.info('stop success');
-    } else {
-        console.error('stop filed,error message is :' + err.message)
-    }
+  if (err == null) {
+    console.info('stop success');
+  } else {
+    console.error('stop filed,error message is :' + err.message)
+  }
 })
 ```
 
@@ -770,9 +770,9 @@ stop(): Promise\<void>
 
 ```js
 avPlayer.stop().then(() => {
-    console.info('stop success');
+  console.info('stop success');
 }, (err) => {
-    console.error('stop filed,error message is :' + err.message)
+  console.error('stop filed,error message is :' + err.message)
 })
 ```
 
@@ -802,11 +802,11 @@ reset(callback: AsyncCallback\<void>): void
 
 ```js
 avPlayer.reset((err) => {
-    if (err == null) {
-        console.info('reset success');
-    } else {
-        console.error('reset filed,error message is :' + err.message)
-    }
+  if (err == null) {
+    console.info('reset success');
+  } else {
+    console.error('reset filed,error message is :' + err.message)
+  }
 })
 ```
 
@@ -836,9 +836,9 @@ reset(): Promise\<void>
 
 ```js
 avPlayer.reset().then(() => {
-    console.info('reset success');
+  console.info('reset success');
 }, (err) => {
-    console.error('reset filed,error message is :' + err.message)
+  console.error('reset filed,error message is :' + err.message)
 })
 ```
 
@@ -868,11 +868,11 @@ release(callback: AsyncCallback\<void>): void
 
 ```js
 avPlayer.release((err) => {
-    if (err == null) {
-        console.info('reset success');
-    } else {
-        console.error('release filed,error message is :' + err.message)
-    }
+  if (err == null) {
+    console.info('reset success');
+  } else {
+    console.error('release filed,error message is :' + err.message)
+  }
 })
 ```
 
@@ -902,9 +902,9 @@ release(): Promise\<void>
 
 ```js
 avPlayer.release().then(() => {
-    console.info('release success');
+  console.info('release success');
 }, (err) => {
-    console.error('release filed,error message is :' + err.message)
+  console.error('release filed,error message is :' + err.message)
 })
 ```
 
@@ -933,22 +933,22 @@ getTrackDescription(callback: AsyncCallback\<Array\<MediaDescription>>): void
 **示例：**
 
 ```js
-printfDescription(obj) {
-    for (let item in obj) {
-        let property = obj[item];
-        console.info('audio key is ' + item);
-        console.info('audio value is ' + property);
-    }
+function printfDescription(obj) {
+  for (let item in obj) {
+    let property = obj[item];
+    console.info('audio key is ' + item);
+    console.info('audio value is ' + property);
+  }
 }
 
 avPlayer.getTrackDescription((error, arrList) => {
-    if ((arrList) != null) {
-        for (let i = 0; i < arrList.length; i++) {
-            printfDescription(arrList[i]);
-        }
-    } else {
-        console.log(`video getTrackDescription fail, error:${error}`);
+  if ((arrList) != null) {
+    for (let i = 0; i < arrList.length; i++) {
+      printfDescription(arrList[i]);
     }
+  } else {
+    console.log(`video getTrackDescription fail, error:${error}`);
+  }
 });
 ```
 
@@ -979,24 +979,24 @@ getTrackDescription(): Promise\<Array\<MediaDescription>>
 ```js
 let arrayDescription;
 
-printfDescription(obj) {
-    for (let item in obj) {
-        let property = obj[item];
-        console.info('audio key is ' + item);
-        console.info('audio value is ' + property);
-    }
+function printfDescription(obj) {
+  for (let item in obj) {
+    let property = obj[item];
+    console.info('audio key is ' + item);
+    console.info('audio value is ' + property);
+  }
 }
 avPlayer.getTrackDescription().then((arrList) => {
-    if (arrList != null) {
-        arrayDescription = arrList;
-    } else {
-        console.log('video getTrackDescription fail');
-    }
+  if (arrList != null) {
+    arrayDescription = arrList;
+  } else {
+    console.log('video getTrackDescription fail');
+  }
 }).catch((error) => {
-    console.info(`video catchCallback, error:${error}`);
+  console.info(`video catchCallback, error:${error}`);
 });
 for (let i = 0; i < arrayDescription.length; i++) {
-    printfDescription(arrayDescription[i]);
+  printfDescription(arrayDescription[i]);
 }
 ```
 
@@ -1041,7 +1041,7 @@ on(type: 'seekDone', callback: Callback\<number>): void
 
 ```js
 avPlayer.on('seekDone', (seekDoneTime:number) => {
-    console.info('seekDone success,and seek time is:' + seekDoneTime)
+  console.info('seekDone success,and seek time is:' + seekDoneTime)
 })
 ```
 
@@ -1104,7 +1104,7 @@ on(type: 'speedDone', callback: Callback\<number>): void
 
 ```js
 avPlayer.on('speedDone', (speed:number) => {
-    console.info('speedDone success,and speed value is:' + speed)
+  console.info('speedDone success,and speed value is:' + speed)
 })
 ```
 
@@ -1140,7 +1140,7 @@ setBitrate(bitrate: number): void
 
 | 参数名  | 类型   | 必填 | 说明                                                         |
 | ------- | ------ | ---- | ------------------------------------------------------------ |
-| bitrate | number | 是   | 指定比特率，可以通过[availableBitrates](#availableBitrates_on)事件获得当前HLS协议流可用的比特率，如果用户指定的比特率不在此列表中，则播放器将从可用比特率列表中选择最小和最接近的比特率。如果通过availableBitrates时间获得的比特率列表长度为0，则不支持指定比特率，也不会产生bitrateDone回调。 |
+| bitrate | number | 是   | 指定比特率，可以通过[availableBitrates](#availableBitrates_on)事件获得当前HLS协议流可用的比特率，如果用户指定的比特率不在此列表中，则播放器将从可用比特率列表中选择最小和最接近的比特率。如果通过availableBitrates事件获得的比特率列表长度为0，则不支持指定比特率，也不会产生bitrateDone回调。 |
 
 **示例：**
 
@@ -1168,7 +1168,7 @@ on(type: 'bitrateDone', callback: Callback\<number>): void
 
 ```js
 avPlayer.on('bitrateDone', (bitrate:number) => {
-    console.info('bitrateDone success,and bitrate value is:' + bitrate)
+  console.info('bitrateDone success,and bitrate value is:' + bitrate)
 })
 ```
 
@@ -1211,7 +1211,7 @@ on(type: 'availableBitrates', callback: (bitrates: Array\<number>) => void): voi
 
 ```js
 avPlayer.on('availableBitrates', (bitrates: Array<number>) => {
-    console.info('availableBitrates success,and availableBitrates length is:' + bitrates.length)
+  console.info('availableBitrates success,and availableBitrates length is:' + bitrates.length)
 })
 ```
 
@@ -1275,7 +1275,7 @@ on(type: 'volumeChange', callback: Callback\<number>): void
 
 ```js
 avPlayer.on('volumeChange', (vol:number) => {
-    console.info('volumeChange success,and new volume is :' + vol)
+  console.info('volumeChange success,and new volume is :' + vol)
 })
 ```
 
@@ -1291,7 +1291,7 @@ off(type: 'volumeChange'): void
 
 | 参数名 | 类型   | 必填 | 说明                                                         |
 | ------ | ------ | ---- | ------------------------------------------------------------ |
-| type   | string | 是   | setVolume生效的事件回调类型，取消注册的事件：'availableBitrates'。 |
+| type   | string | 是   | setVolume生效的事件回调类型，取消注册的事件：'volumeChange'。 |
 
 **示例：**
 
@@ -1318,7 +1318,7 @@ on(type: 'endOfStream', callback: Callback\<void>): void
 
 ```js
 avPlayer.on('endOfStream', () => {
-    console.info('endOfStream success')
+  console.info('endOfStream success')
 })
 ```
 
@@ -1361,7 +1361,7 @@ on(type: 'timeUpdate', callback: Callback\<number>): void
 
 ```js
 avPlayer.on('timeUpdate', (time:number) => {
-    console.info('timeUpdate success,and new time is :' + time)
+  console.info('timeUpdate success,and new time is :' + time)
 })
 ```
 
@@ -1404,7 +1404,7 @@ on(type: 'durationUpdate', callback: Callback\<number>): void
 
 ```js
 avPlayer.on('durationUpdate', (duration) => {
-    console.info('durationUpdate success,new duration is :' + duration)
+  console.info('durationUpdate success,new duration is :' + duration)
 })
 ```
 
@@ -1447,7 +1447,7 @@ on(type: 'bufferingUpdate', callback: (infoType: BufferingInfoType, value: numbe
 
 ```js
 avPlayer.on('bufferingUpdate', (infoType: media.BufferingInfoType, value: number) => {
-    console.info('bufferingUpdate success,and infoType value is:' + infoType + ', value is :' + value)
+  console.info('bufferingUpdate success,and infoType value is:' + infoType + ', value is :' + value)
 })
 ```
 
@@ -1490,7 +1490,7 @@ on(type: 'startRenderFrame', callback: Callback\<void>): void
 
 ```js
 avPlayer.on('startRenderFrame', () => {
-    console.info('startRenderFrame success')
+  console.info('startRenderFrame success')
 })
 ```
 
@@ -1533,7 +1533,7 @@ on(type: 'videoSizeChange', callback: (width: number, height: number) => void):
 
 ```js
 avPlayer.on('videoSizeChange', (width: number, height: number) => {
-    console.info('videoSizeChange success,and width is:' + width + ', height is :' + height)
+  console.info('videoSizeChange success,and width is:' + width + ', height is :' + height)
 })
 ```
 
@@ -1578,7 +1578,7 @@ on(type: 'audioInterrupt', callback: (info: audio.InterruptEvent) => void): void
 import audio from '@ohos.multimedia.audio';
 
 avPlayer.on('audioInterrupt', (info: audio.InterruptEvent) => {
-    console.info('audioInterrupt success,and InterruptEvent info is:' + info)
+  console.info('audioInterrupt success,and InterruptEvent info is:' + info)
 })
 ```
 
@@ -1679,19 +1679,19 @@ avPlayer.off('audioInterrupt')
 ```js
 import media from '@ohos.multimedia.media'
 function printfItemDescription(obj, key) {
-    let property = obj[key];
-    console.info('audio key is ' + key); // 通过key值获取对应的value。key值具体可见[MediaDescriptionKey]
-    console.info('audio value is ' + property); //对应key值得value。其类型可为任意类型，具体key对应value的类型可参考[MediaDescriptionKey]
+  let property = obj[key];
+  console.info('audio key is ' + key); // 通过key值获取对应的value。key值具体可见[MediaDescriptionKey]
+  console.info('audio value is ' + property); //对应key值得value。其类型可为任意类型，具体key对应value的类型可参考[MediaDescriptionKey]
 }
 let audioPlayer = media.createAudioPlayer();
 audioPlayer.getTrackDescription((error, arrList) => {
-    if (arrList != null) {
-        for (let i = 0; i < arrList.length; i++) {
-            printfItemDescription(arrList[i], media.MediaDescriptionKey.MD_KEY_TRACK_TYPE);  //打印出每条轨道MD_KEY_TRACK_TYPE的值
-        }
-    } else {
-        console.log(`audio getTrackDescription fail, error:${error}`);
+  if (arrList != null) {
+    for (let i = 0; i < arrList.length; i++) {
+      printfItemDescription(arrList[i], media.MediaDescriptionKey.MD_KEY_TRACK_TYPE);  //打印出每条轨道MD_KEY_TRACK_TYPE的值
     }
+  } else {
+    console.log(`audio getTrackDescription fail, error:${error}`);
+  }
 });
 ```
 
@@ -1748,32 +1748,32 @@ prepare(config: AVRecorderConfig, callback: AsyncCallback\<void>): void
 ```js
 // 配置参数以实际硬件设备支持的范围为准
 let AVRecorderProfile = {
-    audioBitrate : 48000,
-    audioChannels : 2,
-    audioCodec : media.CodecMimeType.AUDIO_AAC,
-    audioSampleRate : 48000,
-    fileFormat : media.ContainerFormatType.CFT_MPEG_4,
-    videoBitrate : 2000000,
-    videoCodec : media.CodecMimeType.VIDEO_AVC,
-    videoFrameWidth : 640,
-    videoFrameHeight : 480,
-    videoFrameRate : 30
+  audioBitrate : 48000,
+  audioChannels : 2,
+  audioCodec : media.CodecMimeType.AUDIO_AAC,
+  audioSampleRate : 48000,
+  fileFormat : media.ContainerFormatType.CFT_MPEG_4,
+  videoBitrate : 2000000,
+  videoCodec : media.CodecMimeType.VIDEO_AVC,
+  videoFrameWidth : 640,
+  videoFrameHeight : 480,
+  videoFrameRate : 30
 }
 let AVRecorderConfig = {
-    audioSourceType : media.AudioSourceType.AUDIO_SOURCE_TYPE_MIC,
-    videoSourceType : media.VideoSourceType.VIDEO_SOURCE_TYPE_SURFACE_YUV,
-    profile : AVRecorderProfile,
-    url : 'fd://', // 文件需先由调用者创建，赋予读写权限，将文件fd传给此参数，eg.fd://45
-    rotation : 0, // 合理值0、90、180、270，非合理值prepare接口将报错
-    location : { latitude : 30, longitude : 130 }
+  audioSourceType : media.AudioSourceType.AUDIO_SOURCE_TYPE_MIC,
+  videoSourceType : media.VideoSourceType.VIDEO_SOURCE_TYPE_SURFACE_YUV,
+  profile : AVRecorderProfile,
+  url : 'fd://', // 文件需先由调用者创建，赋予读写权限，将文件fd传给此参数，eg.fd://45
+  rotation : 0, // 合理值0、90、180、270，非合理值prepare接口将报错
+  location : { latitude : 30, longitude : 130 }
 }
 
 avRecorder.prepare(AVRecorderConfig, (err) => {
-    if (err == null) {
-        console.info('prepare success');
-    } else {
-        console.info('prepare failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('prepare success');
+  } else {
+    console.error('prepare failed and error is ' + err.message);
+  }
 })
 ```
 
@@ -1817,30 +1817,30 @@ prepare(config: AVRecorderConfig): Promise\<void>
 ```js
 // 配置参数以实际硬件设备支持的范围为准
 let AVRecorderProfile = {
-    audioBitrate : 48000,
-    audioChannels : 2,
-    audioCodec : media.CodecMimeType.AUDIO_AAC,
-    audioSampleRate : 48000,
-    fileFormat : media.ContainerFormatType.CFT_MPEG_4,
-    videoBitrate : 2000000,
-    videoCodec : media.CodecMimeType.VIDEO_AVC,
-    videoFrameWidth : 640,
-    videoFrameHeight : 480,
-    videoFrameRate : 30
+  audioBitrate : 48000,
+  audioChannels : 2,
+  audioCodec : media.CodecMimeType.AUDIO_AAC,
+  audioSampleRate : 48000,
+  fileFormat : media.ContainerFormatType.CFT_MPEG_4,
+  videoBitrate : 2000000,
+  videoCodec : media.CodecMimeType.VIDEO_AVC,
+  videoFrameWidth : 640,
+  videoFrameHeight : 480,
+  videoFrameRate : 30
 }
 let AVRecorderConfig = {
-    audioSourceType : media.AudioSourceType.AUDIO_SOURCE_TYPE_MIC,
-    videoSourceType : media.VideoSourceType.VIDEO_SOURCE_TYPE_SURFACE_YUV,
-    profile : AVRecorderProfile,
-    url : 'fd://',  // 文件需先由调用者创建，赋予读写权限，将文件fd传给此参数，eg.fd://45
-    rotation : 0, // 合理值0、90、180、270，非合理值prepare接口报错
-    location : { latitude : 30, longitude : 130 }
+  audioSourceType : media.AudioSourceType.AUDIO_SOURCE_TYPE_MIC,
+  videoSourceType : media.VideoSourceType.VIDEO_SOURCE_TYPE_SURFACE_YUV,
+  profile : AVRecorderProfile,
+  url : 'fd://',  // 文件需先由调用者创建，赋予读写权限，将文件fd传给此参数，eg.fd://45
+  rotation : 0, // 合理值0、90、180、270，非合理值prepare接口报错
+  location : { latitude : 30, longitude : 130 }
 }
 
 avRecorder.prepare(AVRecorderConfig).then(() => {
-    console.info('prepare success');
+  console.info('prepare success');
 }).catch((err) => {
-    console.info('prepare failed and catch error is ' + err.message);
+  console.error('prepare failed and catch error is ' + err.message);
 });
 
 ```
@@ -1879,12 +1879,12 @@ getInputSurface(callback: AsyncCallback\<string>): void
 let surfaceID = null; // 该surfaceID用于传递给相机接口创造videoOutput
 
 avRecorder.getInputSurface((err, surfaceId) => {
-    if (err == null) {
-        console.info('getInputSurface success');
-        surfaceID = surfaceId;
-    } else {
-        console.info('getInputSurface failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('getInputSurface success');
+    surfaceID = surfaceId;
+  } else {
+    console.error('getInputSurface failed and error is ' + err.message);
+  }
 });
 
 ```
@@ -1923,10 +1923,10 @@ getInputSurface(): Promise\<string>
 let surfaceID = null; // 该surfaceID用于传递给相机接口创造videoOutput
 
 avRecorder.getInputSurface().then((surfaceId) => {
-    console.info('getInputSurface success');
-    surfaceID = surfaceId;
+  console.info('getInputSurface success');
+  surfaceID = surfaceId;
 }).catch((err) => {
-    console.info('getInputSurface failed and catch error is ' + err.message);
+  console.error('getInputSurface failed and catch error is ' + err.message);
 });
 ```
 
@@ -1960,11 +1960,11 @@ start(callback: AsyncCallback\<void>): void
 
 ```js
 avRecorder.start((err) => {
-    if (err == null) {
-        console.info('start AVRecorder success');
-    } else {
-        console.info('start AVRecorder failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('start AVRecorder success');
+  } else {
+    console.error('start AVRecorder failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -1998,9 +1998,9 @@ start(): Promise\<void>
 
 ```js
 avRecorder.start().then(() => {
-    console.info('start AVRecorder success');
+  console.info('start AVRecorder success');
 }).catch((err) => {
-    console.info('start AVRecorder failed and catch error is ' + err.message);
+  console.error('start AVRecorder failed and catch error is ' + err.message);
 });
 ```
 
@@ -2034,11 +2034,11 @@ pause(callback: AsyncCallback\<void>): void
 
 ```js
 avRecorder.pause((err) => {
-    if (err == null) {
-        console.info('pause AVRecorder success');
-    } else {
-        console.info('pause AVRecorder failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('pause AVRecorder success');
+  } else {
+    console.error('pause AVRecorder failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -2072,9 +2072,9 @@ pause(): Promise\<void>
 
 ```js
 avRecorder.pause().then(() => {
-    console.info('pause AVRecorder success');
+  console.info('pause AVRecorder success');
 }).catch((err) => {
-    console.info('pause AVRecorder failed and catch error is ' + err.message);
+  console.error('pause AVRecorder failed and catch error is ' + err.message);
 });
 ```
 
@@ -2108,11 +2108,11 @@ resume(callback: AsyncCallback\<void>): void
 
 ```js
 avRecorder.resume((err) => {
-    if (err == null) {
-        console.info('resume AVRecorder success');
-    } else {
-        console.info('resume AVRecorder failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('resume AVRecorder success');
+  } else {
+    console.error('resume AVRecorder failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -2146,9 +2146,9 @@ resume(): Promise\<void>
 
 ```js
 avRecorder.resume().then(() => {
-    console.info('resume AVRecorder success');
+  console.info('resume AVRecorder success');
 }).catch((err) => {
-    console.info('resume AVRecorder failed and catch error is ' + err.message);
+  console.error('resume AVRecorder failed and catch error is ' + err.message);
 });
 ```
 
@@ -2184,11 +2184,11 @@ stop(callback: AsyncCallback\<void>): void
 
 ```js
 avRecorder.stop((err) => {
-    if (err == null) {
-        console.info('stop AVRecorder success');
-    } else {
-        console.info('stop AVRecorder failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('stop AVRecorder success');
+  } else {
+    console.error('stop AVRecorder failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -2224,9 +2224,9 @@ stop(): Promise\<void>
 
 ```js
 avRecorder.stop().then(() => {
-    console.info('stop AVRecorder success');
+  console.info('stop AVRecorder success');
 }).catch((err) => {
-    console.info('stop AVRecorder failed and catch error is ' + err.message);
+  console.error('stop AVRecorder failed and catch error is ' + err.message);
 });
 ```
 
@@ -2259,11 +2259,11 @@ reset(callback: AsyncCallback\<void>): void
 
 ```js
 avRecorder.reset((err) => {
-    if (err == null) {
-        console.info('reset AVRecorder success');
-    } else {
-        console.info('reset AVRecorder failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('reset AVRecorder success');
+  } else {
+    console.error('reset AVRecorder failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -2296,9 +2296,9 @@ reset(): Promise\<void>
 
 ```js
 avRecorder.reset().then(() => {
-    console.info('reset AVRecorder success');
+  console.info('reset AVRecorder success');
 }).catch((err) => {
-    console.info('reset AVRecorder failed and catch error is ' + err.message);
+  console.error('reset AVRecorder failed and catch error is ' + err.message);
 });
 ```
 
@@ -2330,11 +2330,11 @@ release(callback: AsyncCallback\<void>): void
 
 ```js
 avRecorder.release((err) => {
-    if (err == null) {
-        console.info('release AVRecorder success');
-    } else {
-        console.info('release AVRecorder failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('release AVRecorder success');
+  } else {
+    console.error('release AVRecorder failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -2366,9 +2366,9 @@ release(): Promise\<void>
 
 ```js
 avRecorder.release().then(() => {
-    console.info('release AVRecorder success');
+  console.info('release AVRecorder success');
 }).catch((err) => {
-    console.info('release AVRecorder failed and catch error is ' + err.message);
+  console.error('release AVRecorder failed and catch error is ' + err.message);
 });
 ```
 
@@ -2391,7 +2391,7 @@ on(type: 'stateChange', callback: (state: AVRecorderState, reason: StateChangeRe
 
 ```js
 avRecorder.on('stateChange', async (state, reason) => {
-    console.info('case state has changed, new state is :' + state + ',and new reason is : ' + reason);
+  console.info('case state has changed, new state is :' + state + ',and new reason is : ' + reason);
 });
 ```
 
@@ -2445,7 +2445,7 @@ on(type: 'error', callback: ErrorCallback): void
 
 ```js
 avRecorder.on('error', (err) => {
-    console.info('case avRecorder.on(error) called, errMessage is ' + err.message);
+  console.error('case avRecorder.on(error) called, errMessage is ' + err.message);
 });
 ```
 
@@ -2626,34 +2626,34 @@ prepare(config: VideoRecorderConfig, callback: AsyncCallback\<void>): void;
 ```js
 // 配置参数以实际硬件设备支持的范围为准
 let videoProfile = {
-    audioBitrate : 48000,
-    audioChannels : 2,
-    audioCodec : 'audio/mp4a-latm',
-    audioSampleRate : 48000,
-    fileFormat : 'mp4',
-    videoBitrate : 2000000,
-    videoCodec : 'video/avc',
-    videoFrameWidth : 640,
-    videoFrameHeight : 480,
-    videoFrameRate : 30
+  audioBitrate : 48000,
+  audioChannels : 2,
+  audioCodec : 'audio/mp4a-latm',
+  audioSampleRate : 48000,
+  fileFormat : 'mp4',
+  videoBitrate : 2000000,
+  videoCodec : 'video/avc',
+  videoFrameWidth : 640,
+  videoFrameHeight : 480,
+  videoFrameRate : 30
 }
 
 let videoConfig = {
-    audioSourceType : 1,
-    videoSourceType : 0,
-    profile : videoProfile,
-    url : 'fd://xx',   // 文件需先由调用者创建，并给予适当的权限
-    orientationHint : 0,
-    location : { latitude : 30, longitude : 130 },
+  audioSourceType : 1,
+  videoSourceType : 0,
+  profile : videoProfile,
+  url : 'fd://xx',   // 文件需先由调用者创建，并给予适当的权限
+  orientationHint : 0,
+  location : { latitude : 30, longitude : 130 },
 }
 
 // asyncallback
 videoRecorder.prepare(videoConfig, (err) => {
-    if (err == null) {
-        console.info('prepare success');
-    } else {
-        console.info('prepare failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('prepare success');
+  } else {
+    console.error('prepare failed and error is ' + err.message);
+  }
 })
 ```
 
@@ -2697,32 +2697,32 @@ prepare(config: VideoRecorderConfig): Promise\<void>;
 ```js
 // 配置参数以实际硬件设备支持的范围为准
 let videoProfile = {
-    audioBitrate : 48000,
-    audioChannels : 2,
-    audioCodec : 'audio/mp4a-latm',
-    audioSampleRate : 48000,
-    fileFormat : 'mp4',
-    videoBitrate : 2000000,
-    videoCodec : 'video/avc',
-    videoFrameWidth : 640,
-    videoFrameHeight : 480,
-    videoFrameRate : 30
+  audioBitrate : 48000,
+  audioChannels : 2,
+  audioCodec : 'audio/mp4a-latm',
+  audioSampleRate : 48000,
+  fileFormat : 'mp4',
+  videoBitrate : 2000000,
+  videoCodec : 'video/avc',
+  videoFrameWidth : 640,
+  videoFrameHeight : 480,
+  videoFrameRate : 30
 }
 
 let videoConfig = {
-    audioSourceType : 1,
-    videoSourceType : 0,
-    profile : videoProfile,
-    url : 'fd://xx',   // 文件需先由调用者创建，并给予适当的权限
-    orientationHint : 0,
-    location : { latitude : 30, longitude : 130 },
+  audioSourceType : 1,
+  videoSourceType : 0,
+  profile : videoProfile,
+  url : 'fd://xx',   // 文件需先由调用者创建，并给予适当的权限
+  orientationHint : 0,
+  location : { latitude : 30, longitude : 130 },
 }
 
 // promise
 videoRecorder.prepare(videoConfig).then(() => {
-    console.info('prepare success');
+  console.info('prepare success');
 }).catch((err) => {
-    console.info('prepare failed and catch error is ' + err.message);
+  console.error('prepare failed and catch error is ' + err.message);
 });
 ```
 
@@ -2762,12 +2762,12 @@ getInputSurface(callback: AsyncCallback\<string>): void;
 // asyncallback
 let surfaceID = null;                                               // 传递给外界的surfaceID
 videoRecorder.getInputSurface((err, surfaceId) => {
-    if (err == null) {
-        console.info('getInputSurface success');
-        surfaceID = surfaceId;
-    } else {
-        console.info('getInputSurface failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('getInputSurface success');
+    surfaceID = surfaceId;
+  } else {
+    console.error('getInputSurface failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -2807,10 +2807,10 @@ getInputSurface(): Promise\<string>;
 // promise
 let surfaceID = null;                                               // 传递给外界的surfaceID
 videoRecorder.getInputSurface().then((surfaceId) => {
-    console.info('getInputSurface success');
-    surfaceID = surfaceId;
+  console.info('getInputSurface success');
+  surfaceID = surfaceId;
 }).catch((err) => {
-    console.info('getInputSurface failed and catch error is ' + err.message);
+  console.error('getInputSurface failed and catch error is ' + err.message);
 });
 ```
 
@@ -2847,11 +2847,11 @@ start(callback: AsyncCallback\<void>): void;
 ```js
 // asyncallback
 videoRecorder.start((err) => {
-    if (err == null) {
-        console.info('start videorecorder success');
-    } else {
-        console.info('start videorecorder failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('start videorecorder success');
+  } else {
+    console.error('start videorecorder failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -2888,9 +2888,9 @@ start(): Promise\<void>;
 ```js
 // promise
 videoRecorder.start().then(() => {
-    console.info('start videorecorder success');
+  console.info('start videorecorder success');
 }).catch((err) => {
-    console.info('start videorecorder failed and catch error is ' + err.message);
+  console.error('start videorecorder failed and catch error is ' + err.message);
 });
 ```
 
@@ -2927,11 +2927,11 @@ pause(callback: AsyncCallback\<void>): void;
 ```js
 // asyncallback
 videoRecorder.pause((err) => {
-    if (err == null) {
-        console.info('pause videorecorder success');
-    } else {
-        console.info('pause videorecorder failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('pause videorecorder success');
+  } else {
+    console.error('pause videorecorder failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -2968,9 +2968,9 @@ pause(): Promise\<void>;
 ```js
 // promise
 videoRecorder.pause().then(() => {
-    console.info('pause videorecorder success');
+  console.info('pause videorecorder success');
 }).catch((err) => {
-    console.info('pause videorecorder failed and catch error is ' + err.message);
+  console.error('pause videorecorder failed and catch error is ' + err.message);
 });
 ```
 
@@ -3005,11 +3005,11 @@ resume(callback: AsyncCallback\<void>): void;
 ```js
 // asyncallback
 videoRecorder.resume((err) => {
-    if (err == null) {
-        console.info('resume videorecorder success');
-    } else {
-        console.info('resume videorecorder failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('resume videorecorder success');
+  } else {
+    console.error('resume videorecorder failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -3044,9 +3044,9 @@ resume(): Promise\<void>;
 ```js
 // promise
 videoRecorder.resume().then(() => {
-    console.info('resume videorecorder success');
+  console.info('resume videorecorder success');
 }).catch((err) => {
-    console.info('resume videorecorder failed and catch error is ' + err.message);
+  console.error('resume videorecorder failed and catch error is ' + err.message);
 });
 ```
 
@@ -3083,11 +3083,11 @@ stop(callback: AsyncCallback\<void>): void;
 ```js
 // asyncallback
 videoRecorder.stop((err) => {
-    if (err == null) {
-        console.info('stop videorecorder success');
-    } else {
-        console.info('stop videorecorder failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('stop videorecorder success');
+  } else {
+    console.error('stop videorecorder failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -3124,9 +3124,9 @@ stop(): Promise\<void>;
 ```js
 // promise
 videoRecorder.stop().then(() => {
-    console.info('stop videorecorder success');
+  console.info('stop videorecorder success');
 }).catch((err) => {
-    console.info('stop videorecorder failed and catch error is ' + err.message);
+  console.error('stop videorecorder failed and catch error is ' + err.message);
 });
 ```
 
@@ -3159,11 +3159,11 @@ release(callback: AsyncCallback\<void>): void;
 ```js
 // asyncallback
 videoRecorder.release((err) => {
-    if (err == null) {
-        console.info('release videorecorder success');
-    } else {
-        console.info('release videorecorder failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('release videorecorder success');
+  } else {
+    console.error('release videorecorder failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -3196,9 +3196,9 @@ release(): Promise\<void>;
 ```js
 // promise
 videoRecorder.release().then(() => {
-    console.info('release videorecorder success');
+  console.info('release videorecorder success');
 }).catch((err) => {
-    console.info('release videorecorder failed and catch error is ' + err.message);
+  console.error('release videorecorder failed and catch error is ' + err.message);
 });
 ```
 
@@ -3234,11 +3234,11 @@ reset(callback: AsyncCallback\<void>): void;
 ```js
 // asyncallback
 videoRecorder.reset((err) => {
-    if (err == null) {
-        console.info('reset videorecorder success');
-    } else {
-        console.info('reset videorecorder failed and error is ' + err.message);
-    }
+  if (err == null) {
+    console.info('reset videorecorder success');
+  } else {
+    console.error('reset videorecorder failed and error is ' + err.message);
+  }
 });
 ```
 
@@ -3274,9 +3274,9 @@ reset(): Promise\<void>;
 ```js
 // promise
 videoRecorder.reset().then(() => {
-    console.info('reset videorecorder success');
+  console.info('reset videorecorder success');
 }).catch((err) => {
-    console.info('reset videorecorder failed and catch error is ' + err.message);
+  console.error('reset videorecorder failed and catch error is ' + err.message);
 });
 ```
 
@@ -3309,7 +3309,7 @@ on(type: 'error', callback: ErrorCallback): void
 ```js
 // 当获取videoRecordState接口出错时通过此订阅事件上报
 videoRecorder.on('error', (error) => {                                  // 设置'error'事件回调
-    console.info(`audio error called, error: ${error}`); 
+  console.error(`audio error called, error: ${error}`); 
 })
 ```
 
@@ -3411,15 +3411,15 @@ createVideoPlayer(callback: AsyncCallback\<VideoPlayer>): void
 **示例：**
 
 ```js
-let videoPlayer
+let videoPlayer;
 
 media.createVideoPlayer((error, video) => {
-   if (video != null) {
-       videoPlayer = video;
-       console.info('video createVideoPlayer success');
-   } else {
-       console.info(`video createVideoPlayer fail, error:${error}`);
-   }
+  if (video != null) {
+    videoPlayer = video;
+    console.info('video createVideoPlayer success');
+  } else {
+    console.error(`video createVideoPlayer fail, error:${error}`);
+  }
 });
 ```
 
@@ -3443,17 +3443,17 @@ createVideoPlayer(): Promise\<VideoPlayer>
 **示例：**
 
 ```js
-let videoPlayer
+let videoPlayer;
 
 media.createVideoPlayer().then((video) => {
-   if (video != null) {
-       videoPlayer = video;
-       console.info('video createVideoPlayer success');
-   } else {
-       console.info('video createVideoPlayer fail');
-   }
+  if (video != null) {
+    videoPlayer = video;
+    console.info('video createVideoPlayer success');
+  } else {
+    console.error('video createVideoPlayer fail');
+  }
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error:${error}`);
 });
 ```
 
@@ -3536,7 +3536,7 @@ play(): void
 
 ```js
 audioPlayer.on('play', () => {    //设置'play'事件回调
-    console.log('audio play success');
+  console.log('audio play success');
 });
 audioPlayer.play();
 ```
@@ -3553,7 +3553,7 @@ pause(): void
 
 ```js
 audioPlayer.on('pause', () => {    //设置'pause'事件回调
-    console.log('audio pause success');
+  console.log('audio pause success');
 });
 audioPlayer.pause();
 ```
@@ -3570,7 +3570,7 @@ stop(): void
 
 ```js
 audioPlayer.on('stop', () => {    //设置'stop'事件回调
-    console.log('audio stop success');
+  console.log('audio stop success');
 });
 audioPlayer.stop();
 ```
@@ -3587,7 +3587,7 @@ reset(): void
 
 ```js
 audioPlayer.on('reset', () => {    //设置'reset'事件回调
-    console.log('audio reset success');
+  console.log('audio reset success');
 });
 audioPlayer.reset();
 ```
@@ -3610,11 +3610,11 @@ seek(timeMs: number): void
 
 ```js
 audioPlayer.on('timeUpdate', (seekDoneTime) => {    //设置'timeUpdate'事件回调
-    if (seekDoneTime == null) {
-        console.info('audio seek fail');
-        return;
-    }
-    console.log('audio seek success. seekDoneTime: ' + seekDoneTime);
+  if (seekDoneTime == null) {
+    console.info('audio seek fail');
+    return;
+  }
+  console.log('audio seek success. seekDoneTime: ' + seekDoneTime);
 });
 audioPlayer.seek(30000);    //seek到30000ms的位置
 ```
@@ -3637,7 +3637,7 @@ setVolume(vol: number): void
 
 ```js
 audioPlayer.on('volumeChange', () => {    //设置'volumeChange'事件回调
-    console.log('audio volumeChange success');
+  console.log('audio volumeChange success');
 });
 audioPlayer.setVolume(1);    //设置音量到100%
 ```
@@ -3675,21 +3675,21 @@ getTrackDescription(callback: AsyncCallback\<Array\<MediaDescription>>): void
 
 ```js
 function printfDescription(obj) {
-    for (let item in obj) {
-        let property = obj[item];
-        console.info('audio key is ' + item);
-        console.info('audio value is ' + property);
-    }
+  for (let item in obj) {
+    let property = obj[item];
+    console.info('audio key is ' + item);
+    console.info('audio value is ' + property);
+  }
 }
 
 audioPlayer.getTrackDescription((error, arrList) => {
-    if (arrList != null) {
-        for (let i = 0; i < arrList.length; i++) {
-            printfDescription(arrList[i]);
-        }
-    } else {
-        console.log(`audio getTrackDescription fail, error:${error}`);
+  if (arrList != null) {
+    for (let i = 0; i < arrList.length; i++) {
+      printfDescription(arrList[i]);
     }
+  } else {
+    console.log(`audio getTrackDescription fail, error:${error}`);
+  }
 });
 ```
 
@@ -3711,25 +3711,25 @@ getTrackDescription(): Promise\<Array\<MediaDescription>>
 
 ```js
 function printfDescription(obj) {
-    for (let item in obj) {
-        let property = obj[item];
-        console.info('audio key is ' + item);
-        console.info('audio value is ' + property);
-    }
+  for (let item in obj) {
+    let property = obj[item];
+    console.info('audio key is ' + item);
+    console.info('audio value is ' + property);
+  }
 }
 let arrayDescription = null
 audioPlayer.getTrackDescription().then((arrList) => {
-    if (arrList != null) {
-        arrayDescription = arrList;
-    } else {
-        console.log('audio getTrackDescription fail');
-    }
+  if (arrList != null) {
+    arrayDescription = arrList;
+  } else {
+    console.log('audio getTrackDescription fail');
+  }
 }).catch((error) => {
-   console.info(`audio catchCallback, error:${error}`);
+  console.info(`audio catchCallback, error:${error}`);
 });
 
 for (let i = 0; i < arrayDescription.length; i++) {
-    printfDescription(arrayDescription[i]);
+  printfDescription(arrayDescription[i]);
 }
 ```
 
@@ -3752,8 +3752,8 @@ on(type: 'bufferingUpdate', callback: (infoType: BufferingInfoType, value: numbe
 
 ```js
 audioPlayer.on('bufferingUpdate', (infoType, value) => {
-    console.log('audio bufferingInfo type: ' + infoType);
-    console.log('audio bufferingInfo value: ' + value);
+  console.log('audio bufferingInfo type: ' + infoType);
+  console.log('audio bufferingInfo value: ' + value);
 });
 ```
 
@@ -3779,40 +3779,40 @@ import fs from '@ohos.file.fs';
 
 let audioPlayer = media.createAudioPlayer();  //创建一个音频播放实例
 audioPlayer.on('dataLoad', () => {            //设置'dataLoad'事件回调，src属性设置成功后，触发此回调
-    console.info('audio set source success');
-    audioPlayer.play();                       //开始播放，并触发'play'事件回调
+  console.info('audio set source success');
+  audioPlayer.play();                       //开始播放，并触发'play'事件回调
 });
 audioPlayer.on('play', () => {                //设置'play'事件回调
-    console.info('audio play success');
-    audioPlayer.seek(30000);                  //调用seek方法，并触发'timeUpdate'事件回调
+  console.info('audio play success');
+  audioPlayer.seek(30000);                  //调用seek方法，并触发'timeUpdate'事件回调
 });
 audioPlayer.on('pause', () => {               //设置'pause'事件回调
-    console.info('audio pause success');
-    audioPlayer.stop();                       //停止播放，并触发'stop'事件回调
+  console.info('audio pause success');
+  audioPlayer.stop();                       //停止播放，并触发'stop'事件回调
 });
 audioPlayer.on('reset', () => {               //设置'reset'事件回调
-    console.info('audio reset success');
-    audioPlayer.release();                    //释放播放实例资源
-    audioPlayer = undefined;
+  console.info('audio reset success');
+  audioPlayer.release();                    //释放播放实例资源
+  audioPlayer = undefined;
 });
 audioPlayer.on('timeUpdate', (seekDoneTime) => {  //设置'timeUpdate'事件回调
-    if (seekDoneTime == null) {
-        console.info('audio seek fail');
-        return;
-    }
-    console.info('audio seek success, and seek time is ' + seekDoneTime);
-    audioPlayer.setVolume(0.5);                //设置音量为50%，并触发'volumeChange'事件回调
+  if (seekDoneTime == null) {
+    console.info('audio seek fail');
+    return;
+  }
+  console.info('audio seek success, and seek time is ' + seekDoneTime);
+  audioPlayer.setVolume(0.5);                //设置音量为50%，并触发'volumeChange'事件回调
 });
 audioPlayer.on('volumeChange', () => {         //设置'volumeChange'事件回调
-    console.info('audio volumeChange success');
-    audioPlayer.pause();                       //暂停播放，并触发'pause'事件回调
+  console.info('audio volumeChange success');
+  audioPlayer.pause();                       //暂停播放，并触发'pause'事件回调
 });
 audioPlayer.on('finish', () => {               //设置'finish'事件回调
-    console.info('audio play finish');
-    audioPlayer.stop();                        //停止播放，并触发'stop'事件回调
+  console.info('audio play finish');
+  audioPlayer.stop();                        //停止播放，并触发'stop'事件回调
 });
 audioPlayer.on('error', (error) => {           //设置'error'事件回调
-    console.info(`audio error called, error: ${error}`);
+  console.error(`audio error called, error: ${error}`);
 });
 
 // 用户选择音频设置fd(本地播放)
@@ -3820,13 +3820,13 @@ let fdPath = 'fd://';
 // path路径的码流可通过"hdc file send D:\xxx\01.mp3 /data/accounts/account_0/appdata" 命令，将其推送到设备上
 let path = '/data/accounts/account_0/appdata/ohos.xxx.xxx.xxx/01.mp3';
 fs.open(path).then((file) => {
-   fdPath = fdPath + '' + file.fd;
-   console.info('open fd success fd is' + fdPath);
-   audioPlayer.src = fdPath;  //设置src属性，并触发'dataLoad'事件回调
+  fdPath = fdPath + '' + file.fd;
+  console.info('open fd success fd is' + fdPath);
+  audioPlayer.src = fdPath;  //设置src属性，并触发'dataLoad'事件回调
 }, (err) => {
-   console.info('open fd failed err is' + err);
+  console.info('open fd failed err is' + err);
 }).catch((err) => {
-   console.info('open fd failed err is' + err);
+  console.info('open fd failed err is' + err);
 });
 ```
 
@@ -3849,11 +3849,11 @@ on(type: 'timeUpdate', callback: Callback\<number>): void
 
 ```js
 audioPlayer.on('timeUpdate', (newTime) => {    //设置'timeUpdate'事件回调
-    if (newTime == null) {
-        console.info('audio timeUpadate fail');
-        return;
-    }
-    console.log('audio timeUpadate success. seekDoneTime: ' + newTime);
+  if (newTime == null) {
+    console.info('audio timeUpadate fail');
+    return;
+  }
+  console.log('audio timeUpadate success. seekDoneTime: ' + newTime);
 });
 audioPlayer.play();    //开始播放后，自动触发时间戳更新事件
 ```
@@ -3877,7 +3877,7 @@ on(type: 'error', callback: ErrorCallback): void
 
 ```js
 audioPlayer.on('error', (error) => {      //设置'error'事件回调
-    console.info(`audio error called, error: ${error}`); 
+  console.error(`audio error called, error: ${error}`); 
 });
 audioPlayer.setVolume(3);  //设置volume为无效值，触发'error'事件
 ```
@@ -3945,11 +3945,11 @@ setDisplaySurface(surfaceId: string, callback: AsyncCallback\<void>): void
 ```js
 let surfaceId = null;
 videoPlayer.setDisplaySurface(surfaceId, (err) => {
-    if (err == null) {
-        console.info('setDisplaySurface success!');
-    } else {
-        console.info('setDisplaySurface fail!');
-    }
+  if (err == null) {
+    console.info('setDisplaySurface success!');
+  } else {
+    console.error('setDisplaySurface fail!');
+  }
 });
 ```
 
@@ -3980,9 +3980,9 @@ setDisplaySurface(surfaceId: string): Promise\<void>
 ```js
 let surfaceId = null;
 videoPlayer.setDisplaySurface(surfaceId).then(() => {
-    console.info('setDisplaySurface success');
+  console.info('setDisplaySurface success');
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error:${error}`);
 });
 ```
 
@@ -4004,11 +4004,11 @@ prepare(callback: AsyncCallback\<void>): void
 
 ```js
 videoPlayer.prepare((err) => {
-    if (err == null) {
-        console.info('prepare success!');
-    } else {
-        console.info('prepare fail!');
-    }
+  if (err == null) {
+    console.info('prepare success!');
+  } else {
+    console.error('prepare fail!');
+  }
 });
 ```
 
@@ -4030,9 +4030,9 @@ prepare(): Promise\<void>
 
 ```js
 videoPlayer.prepare().then(() => {
-    console.info('prepare success');
+  console.info('prepare success');
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error:${error}`);
 });
 ```
 
@@ -4054,11 +4054,11 @@ play(callback: AsyncCallback\<void>): void;
 
 ```js
 videoPlayer.play((err) => {
-    if (err == null) {
-        console.info('play success!');
-    } else {
-        console.info('play fail!');
-    }
+  if (err == null) {
+    console.info('play success!');
+  } else {
+    console.error('play fail!');
+  }
 });
 ```
 
@@ -4080,9 +4080,9 @@ play(): Promise\<void>;
 
 ```js
 videoPlayer.play().then(() => {
-    console.info('play success');
+  console.info('play success');
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error:${error}`);
 });
 ```
 
@@ -4104,11 +4104,11 @@ pause(callback: AsyncCallback\<void>): void
 
 ```js
 videoPlayer.pause((err) => {
-    if (err == null) {
-        console.info('pause success!');
-    } else {
-        console.info('pause fail!');
-    }
+  if (err == null) {
+    console.info('pause success!');
+  } else {
+    console.info('pause fail!');
+  }
 });
 ```
 
@@ -4130,9 +4130,9 @@ pause(): Promise\<void>
 
 ```js
 videoPlayer.pause().then(() => {
-    console.info('pause success');
+  console.info('pause success');
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error:${error}`);
 });
 ```
 
@@ -4154,11 +4154,11 @@ stop(callback: AsyncCallback\<void>): void
 
 ```js
 videoPlayer.stop((err) => {
-    if (err == null) {
-        console.info('stop success!');
-    } else {
-        console.info('stop fail!');
-    }
+  if (err == null) {
+    console.info('stop success!');
+  } else {
+    console.error('stop fail!');
+  }
 });
 ```
 
@@ -4180,9 +4180,9 @@ stop(): Promise\<void>
 
 ```js
 videoPlayer.stop().then(() => {
-    console.info('stop success');
+  console.info('stop success');
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error:${error}`);
 });
 ```
 
@@ -4204,11 +4204,11 @@ reset(callback: AsyncCallback\<void>): void
 
 ```js
 videoPlayer.reset((err) => {
-    if (err == null) {
-        console.info('reset success!');
-    } else {
-        console.info('reset fail!');
-    }
+  if (err == null) {
+    console.info('reset success!');
+  } else {
+    console.error('reset fail!');
+  }
 });
 ```
 
@@ -4230,9 +4230,9 @@ reset(): Promise\<void>
 
 ```js
 videoPlayer.reset().then(() => {
-    console.info('reset success');
+  console.info('reset success');
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error:${error}`);
 });
 ```
 
@@ -4256,11 +4256,11 @@ seek(timeMs: number, callback: AsyncCallback\<number>): void
 ```js
 let seekTime = 5000;
 videoPlayer.seek(seekTime, (err, result) => {
-    if (err == null) {
-        console.info('seek success!');
-    } else {
-        console.info('seek fail!');
-    }
+  if (err == null) {
+    console.info('seek success!');
+  } else {
+    console.error('seek fail!');
+  }
 });
 ```
 
@@ -4286,11 +4286,11 @@ seek(timeMs: number, mode:SeekMode, callback: AsyncCallback\<number>): void
 import media from '@ohos.multimedia.media'
 let seekTime = 5000;
 videoPlayer.seek(seekTime, media.SeekMode.SEEK_NEXT_SYNC, (err, result) => {
-    if (err == null) {
-        console.info('seek success!');
-    } else {
-        console.info('seek fail!');
-    }
+  if (err == null) {
+    console.info('seek success!');
+  } else {
+    console.error('seek fail!');
+  }
 });
 ```
 
@@ -4321,15 +4321,15 @@ seek(timeMs: number, mode?:SeekMode): Promise\<number>
 import media from '@ohos.multimedia.media'
 let seekTime = 5000;
 videoPlayer.seek(seekTime).then((seekDoneTime) => { // seekDoneTime表示seek完成后的时间点
-    console.info('seek success');
+  console.info('seek success');
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error:${error}`);
 });
 
 videoPlayer.seek(seekTime, media.SeekMode.SEEK_NEXT_SYNC).then((seekDoneTime) => {
-    console.info('seek success');
+  console.info('seek success');
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error:${error}`);
 });
 ```
 
@@ -4353,11 +4353,11 @@ setVolume(vol: number, callback: AsyncCallback\<void>): void
 ```js
 let vol = 0.5;
 videoPlayer.setVolume(vol, (err, result) => {
-    if (err == null) {
-        console.info('setVolume success!');
-    } else {
-        console.info('setVolume fail!');
-    }
+  if (err == null) {
+    console.info('setVolume success!');
+  } else {
+    console.error('setVolume fail!');
+  }
 });
 ```
 
@@ -4386,9 +4386,9 @@ setVolume(vol: number): Promise\<void>
 ```js
 let vol = 0.5;
 videoPlayer.setVolume(vol).then(() => {
-    console.info('setVolume success');
+  console.info('setVolume success');
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error:${error}`);
 });
 ```
 
@@ -4410,11 +4410,11 @@ release(callback: AsyncCallback\<void>): void
 
 ```js
 videoPlayer.release((err) => {
-    if (err == null) {
-        console.info('release success!');
-    } else {
-        console.info('release fail!');
-    }
+  if (err == null) {
+    console.info('release success!');
+  } else {
+    console.error('release fail!');
+  }
 });
 ```
 
@@ -4436,9 +4436,9 @@ release(): Promise\<void>
 
 ```js
 videoPlayer.release().then(() => {
-    console.info('release success');
+  console.info('release success');
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error:${error}`);
 });
 ```
 
@@ -4460,21 +4460,21 @@ getTrackDescription(callback: AsyncCallback\<Array\<MediaDescription>>): void
 
 ```js
 function printfDescription(obj) {
-    for (let item in obj) {
-        let property = obj[item];
-        console.info('video key is ' + item);
-        console.info('video value is ' + property);
-    }
+  for (let item in obj) {
+    let property = obj[item];
+    console.info('video key is ' + item);
+    console.info('video value is ' + property);
+  }
 }
 
 videoPlayer.getTrackDescription((error, arrList) => {
-    if ((arrList) != null) {
-        for (let i = 0; i < arrList.length; i++) {
-            printfDescription(arrList[i]);
-        }
-    } else {
-        console.log(`video getTrackDescription fail, error:${error}`);
+  if ((arrList) != null) {
+    for (let i = 0; i < arrList.length; i++) {
+      printfDescription(arrList[i]);
     }
+  } else {
+    console.log(`video getTrackDescription fail, error:${error}`);
+  }
 });
 ```
 
@@ -4496,25 +4496,25 @@ getTrackDescription(): Promise\<Array\<MediaDescription>>
 
 ```js
 function printfDescription(obj) {
-    for (let item in obj) {
-        let property = obj[item];
-        console.info('video key is ' + item);
-        console.info('video value is ' + property);
-    }
+  for (let item in obj) {
+    let property = obj[item];
+    console.info('video key is ' + item);
+    console.info('video value is ' + property);
+  }
 }
 
 let arrayDescription;
 videoPlayer.getTrackDescription().then((arrList) => {
-    if (arrList != null) {
-        arrayDescription = arrList;
-    } else {
-        console.log('video getTrackDescription fail');
-    }
+  if (arrList != null) {
+    arrayDescription = arrList;
+  } else {
+    console.log('video getTrackDescription fail');
+  }
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.info(`video catchCallback, error:${error}`);
 });
 for (let i = 0; i < arrayDescription.length; i++) {
-    printfDescription(arrayDescription[i]);
+  printfDescription(arrayDescription[i]);
 }
 ```
 
@@ -4540,11 +4540,11 @@ import media from '@ohos.multimedia.media'
 let speed = media.PlaybackSpeed.SPEED_FORWARD_2_00_X;
 
 videoPlayer.setSpeed(speed, (err, result) => {
-    if (err == null) {
-        console.info('setSpeed success!');
-    } else {
-        console.info('setSpeed fail!');
-    }
+  if (err == null) {
+    console.info('setSpeed success!');
+  } else {
+    console.error('setSpeed fail!');
+  }
 });
 ```
 
@@ -4575,9 +4575,9 @@ import media from '@ohos.multimedia.media'
 let speed = media.PlaybackSpeed.SPEED_FORWARD_2_00_X;
 
 videoPlayer.setSpeed(speed).then(() => {
-    console.info('setSpeed success');
+  console.info('setSpeed success');
 }).catch((error) => {
-   console.info(`video catchCallback, error:${error}`);
+  console.error(`video catchCallback, error:${error}`);
 });
 ```
 
@@ -4600,7 +4600,7 @@ on(type: 'playbackCompleted', callback: Callback\<void>): void
 
 ```js
 videoPlayer.on('playbackCompleted', () => {
-    console.info('playbackCompleted success!');
+  console.info('playbackCompleted success!');
 });
 ```
 
@@ -4623,8 +4623,8 @@ on(type: 'bufferingUpdate', callback: (infoType: BufferingInfoType, value: numbe
 
 ```js
 videoPlayer.on('bufferingUpdate', (infoType, value) => {
-    console.log('video bufferingInfo type: ' + infoType);
-    console.log('video bufferingInfo value: ' + value);
+  console.log('video bufferingInfo type: ' + infoType);
+  console.log('video bufferingInfo value: ' + value);
 });
 ```
 
@@ -4647,7 +4647,7 @@ on(type: 'startRenderFrame', callback: Callback\<void>): void
 
 ```js
 videoPlayer.on('startRenderFrame', () => {
-    console.info('startRenderFrame success!');
+  console.info('startRenderFrame success!');
 });
 ```
 
@@ -4670,8 +4670,8 @@ on(type: 'videoSizeChanged', callback: (width: number, height: number) => void):
 
 ```js
 videoPlayer.on('videoSizeChanged', (width, height) => {
-    console.log('video width is: ' + width);
-    console.log('video height is: ' + height);
+  console.log('video width is: ' + width);
+  console.log('video height is: ' + height);
 });
 ```
 
@@ -4694,7 +4694,7 @@ on(type: 'error', callback: ErrorCallback): void
 
 ```js
 videoPlayer.on('error', (error) => {      // 设置'error'事件回调
-    console.info(`video error called, error: ${error}`);
+  console.error(`video error called, error: ${error}`);
 });
 videoPlayer.url = 'fd://error';  //设置错误的播放地址，触发'error'事件
 ```
@@ -4744,16 +4744,16 @@ prepare(config: AudioRecorderConfig): void
 
 ```js
 let audioRecorderConfig = {
-    audioEncoder : media.AudioEncoder.AAC_LC,
-    audioEncodeBitRate : 22050,
-    audioSampleRate : 22050,
-    numberOfChannels : 2,
-    format : media.AudioOutputFormat.AAC_ADTS,
-    uri : 'fd://1',       // 文件需先由调用者创建，并给予适当的权限
-    location : { latitude : 30, longitude : 130},
+  audioEncoder : media.AudioEncoder.AAC_LC,
+  audioEncodeBitRate : 22050,
+  audioSampleRate : 22050,
+  numberOfChannels : 2,
+  format : media.AudioOutputFormat.AAC_ADTS,
+  uri : 'fd://1',       // 文件需先由调用者创建，并给予适当的权限
+  location : { latitude : 30, longitude : 130},
 }
 audioRecorder.on('prepare', () => {    //设置'prepare'事件回调
-    console.log('prepare success');
+  console.log('prepare success');
 });
 audioRecorder.prepare(audioRecorderConfig);
 ```
@@ -4771,7 +4771,7 @@ start(): void
 
 ```js
 audioRecorder.on('start', () => {    //设置'start'事件回调
-    console.log('audio recorder start success');
+  console.log('audio recorder start success');
 });
 audioRecorder.start();
 ```
@@ -4788,7 +4788,7 @@ pause():void
 
 ```js
 audioRecorder.on('pause', () => {    //设置'pause'事件回调
-    console.log('audio recorder pause success');
+  console.log('audio recorder pause success');
 });
 audioRecorder.pause();
 ```
@@ -4805,7 +4805,7 @@ resume():void
 
 ```js
 audioRecorder.on('resume', () => {    //设置'resume'事件回调
-    console.log('audio recorder resume success');
+  console.log('audio recorder resume success');
 });
 audioRecorder.resume();
 ```
@@ -4822,7 +4822,7 @@ stop(): void
 
 ```js
 audioRecorder.on('stop', () => {    //设置'stop'事件回调
-    console.log('audio recorder stop success');
+  console.log('audio recorder stop success');
 });
 audioRecorder.stop();
 ```
@@ -4839,7 +4839,7 @@ release(): void
 
 ```js
 audioRecorder.on('release', () => {    //设置'release'事件回调
-    console.log('audio recorder release success');
+  console.log('audio recorder release success');
 });
 audioRecorder.release();
 audioRecorder = undefined;
@@ -4859,7 +4859,7 @@ reset(): void
 
 ```js
 audioRecorder.on('reset', () => {    //设置'reset'事件回调
-    console.log('audio recorder reset success');
+  console.log('audio recorder reset success');
 });
 audioRecorder.reset();
 ```
@@ -4884,38 +4884,38 @@ on(type: 'prepare' | 'start' | 'pause' | 'resume' | 'stop' | 'release' | 'reset'
 ```js
 let audioRecorder = media.createAudioRecorder();                                  // 创建一个音频录制实例
 let audioRecorderConfig = {
-    audioEncoder : media.AudioEncoder.AAC_LC,
-    audioEncodeBitRate : 22050,
-    audioSampleRate : 22050,
-    numberOfChannels : 2,
-    format : media.AudioOutputFormat.AAC_ADTS,
-    uri : 'fd://xx',                                                            // 文件需先由调用者创建，并给予适当的权限
-    location : { latitude : 30, longitude : 130},
+  audioEncoder : media.AudioEncoder.AAC_LC,
+  audioEncodeBitRate : 22050,
+  audioSampleRate : 22050,
+  numberOfChannels : 2,
+  format : media.AudioOutputFormat.AAC_ADTS,
+  uri : 'fd://xx',                                                            // 文件需先由调用者创建，并给予适当的权限
+  location : { latitude : 30, longitude : 130},
 }
 audioRecorder.on('error', (error) => {                                             // 设置'error'事件回调
-    console.info(`audio error called, error: ${error}`);
+  console.info(`audio error called, error: ${error}`);
 });
 audioRecorder.on('prepare', () => {                                              // 设置'prepare'事件回调
-    console.log('prepare success');
-    audioRecorder.start();                                                       // 开始录制，并触发'start'事件回调
+  console.log('prepare success');
+  audioRecorder.start();                                                       // 开始录制，并触发'start'事件回调
 });
 audioRecorder.on('start', () => {                                                 // 设置'start'事件回调
-    console.log('audio recorder start success');
+  console.log('audio recorder start success');
 });
 audioRecorder.on('pause', () => {                                                 // 设置'pause'事件回调
-    console.log('audio recorder pause success');
+  console.log('audio recorder pause success');
 });
 audioRecorder.on('resume', () => {                                                 // 设置'resume'事件回调
-    console.log('audio recorder resume success');
+  console.log('audio recorder resume success');
 });
 audioRecorder.on('stop', () => {                                                 // 设置'stop'事件回调
-    console.log('audio recorder stop success');
+  console.log('audio recorder stop success');
 });
 audioRecorder.on('release', () => {                                                 // 设置'release'事件回调
-    console.log('audio recorder release success');
+  console.log('audio recorder release success');
 });
 audioRecorder.on('reset', () => {                                                 // 设置'reset'事件回调
-    console.log('audio recorder reset success');
+  console.log('audio recorder reset success');
 });
 audioRecorder.prepare(audioRecorderConfig)                                       // 设置录制参数 ，并触发'prepare'事件回调
 ```
@@ -4939,16 +4939,16 @@ on(type: 'error', callback: ErrorCallback): void
 
 ```js
 let audioRecorderConfig = {
-    audioEncoder : media.AudioEncoder.AAC_LC,
-    audioEncodeBitRate : 22050,
-    audioSampleRate : 22050,
-    numberOfChannels : 2,
-    format : media.AudioOutputFormat.AAC_ADTS,
-    uri : 'fd://xx',                                                     // 文件需先由调用者创建，并给予适当的权限
-    location : { latitude : 30, longitude : 130},
+  audioEncoder : media.AudioEncoder.AAC_LC,
+  audioEncodeBitRate : 22050,
+  audioSampleRate : 22050,
+  numberOfChannels : 2,
+  format : media.AudioOutputFormat.AAC_ADTS,
+  uri : 'fd://xx',                                                     // 文件需先由调用者创建，并给予适当的权限
+  location : { latitude : 30, longitude : 130},
 }
 audioRecorder.on('error', (error) => {                                  // 设置'error'事件回调
-    console.info(`audio error called, error: ${error}`); 
+  console.error(`audio error called, error: ${error}`);
 });
 audioRecorder.prepare(audioRecorderConfig);                            // prepare不设置参数，触发'error'事件
 ```