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• 句法
• 范例
• 规范
• 浏览器兼容性
• 相关话题

getAudioTracks() 方法在 MediaStream interface returns a sequence that represents all the MediaStreamTrack objects in this stream's track set where MediaStreamTrack.kind is audio .

句法

var mediaStreamTracks = mediaStream.getAudioTracks()
					

参数

None.

返回值

An array of MediaStreamTrack objects, one for each audio track contained in the stream. Audio tracks are those tracks whose kind 特性为 audio . The array is empty if the stream contains no audio tracks.

注意： The order of the returned tracks is not defined by the specification and may, in fact, change from one call to getAudioTracks() to the next.

Early versions of this API included a special AudioStreamTrack interface which was used as the type for each entry in the list of audio streams; however, this has since been merged into the main MediaStreamTrack 接口。

范例

This example gets a webcam's audio and video in a stream using getUserMedia() , attaches the stream to a <video> element, then sets a timer that, upon expiring, will stop the first audio track found on the stream.

navigator.mediaDevices.getUserMedia({audio: true, video: true})
.then(mediaStream => {
  document.querySelector('video').srcObject = mediaStream;
  // Stop the audio stream after 5 seconds
  setTimeout(() => {
    const tracks = mediaStream.getAudioTracks()
    tracks[0].stop()
  }, 5000)
})
					

规范

规范	状态	注释
媒体捕获和流 The definition of 'getAudioTracks()' in that specification.	候选推荐	初始定义。

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
getAudioTracks	Chrome 26	Edge 12	Firefox 22 22 Prior to Firefox 64, this method returned an array of AudioStreamTrack objects. However, MediaStreamTrack has now subsumed that interface's functionality.	IE No	Opera Yes	Safari Yes	WebView Android 37	Chrome Android 26	Firefox Android 22 22 Prior to Firefox 64, this method returned an array of AudioStreamTrack objects. However, MediaStreamTrack has now subsumed that interface's functionality.	Opera Android No	Safari iOS Yes	Samsung Internet Android 1.5

图例

完整支持

完整支持

不支持

不支持

见实现注意事项。

元数据

• 最后修改： Mar 18, 2019

相关话题

1. Media Streams API
2. MediaStream
3. 构造函数

   1. MediaStream()
4. 特性

   1. active
   2. ended
   3. id
   4. onaddtrack
   5. onremovetrack
5. 方法

   1. addTrack()
   2. clone()
   3. getAudioTracks()
   4. getTrackById()
   5. getTracks()
   6. getVideoTracks()
6. 事件

   1. addtrack
   2. removetrack
7. 继承：

   1. EventTarget
8. Related pages for Media Capture and Streams

   1. AudioStreamTrack
   2. BlobEvent
   3. CanvasCaptureMediaStream
   4. ConstrainBoolean
   5. ConstrainDOMString
   6. ConstrainDouble
   7. ConstrainLong
   8. DoubleRange
   9. HTMLCanvasElement.captureStream()
   10. LongRange
   11. MediaDevices
   12. MediaStreamTrack
   13. MediaStreamTrackEvent
   14. MediaTrackCapabilities
   15. MediaTrackConstraints
   16. MediaTrackSettings
   17. MediaTrackSupportedConstraints
   18. Navigator.mediaDevices
   19. NavigatorUserMedia
   20. NavigatorUserMediaError
   21. VideoStreamTrack
   22. navigator.mediaDevices.getUserMedia()