AudioTrack.enabled

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AudioTrack property 被启用 specifies whether or not the described audio track is currently enabled for use. If the track is disabled by setting enabled to false , the track is muted and does not produce audio.

句法

isAudioEnabled = AudioTrack.enabled;
AudioTrack.enabled = true | false;

值

enabled property is a Boolean whose value is true if the track is enabled; enabled tracks produce audio while the media is playing. Setting enabled to false effectively mutes the audio track, preventing it from contributing to the media's audio performance.

范例

This example switches between the main and commentary audio tracks of a media element.

function swapCommentaryMain() {
  var videoElem = document.getElementById("main-video");
  var audioTrackMain;
  var audioTrackCommentary;
  videoElem.audioTracks.forEach(track) {
    if (track.kind === "main") {
      audioTrackMain = track;
    } else if (track.kind === "commentary") {
      audioTrackCommentary = track;
    }
  }
  if (audioTrackMain && audioTrackCommentary) {
    var commentaryEnabled = audioTrackCommentary.enabled;
    audioTrackCommentary.enabled = audioTrackMain.enabled;
    audioTrackMain.enabled = commentaryEnabled;
  }
}

swapCommentaryMain() function above finds within the audio tracks of the <video> element "main-video" the audio tracks whose kind 值为 "main" and "commentary" . These represent the primary audio track and the commentary track.

注意： This example assumes that there is only one of each kind of track in the video, but this is not necessarily the case.

The element's audio tracks are then scanned through using the JavaScript forEach() method (although the audioTracks property of a media element isn't actually a JavaScript array, it can be accessed like one for the most part).

The scan looks for the tracks whose kind 值为 "main" and "commentary" and remembers those AudioTrack objects. Once those have been found, the values of the two tracks' enabled properties are exchanged, which results in swapping which of the two tracks is currently active.

规范

规范	状态	注释
HTML 实时标准 The definition of 'AudioTrack.enabled' in that specification.	实时标准
HTML5 The definition of 'AudioTrack.enabled' in that specification.	推荐

浏览器兼容性

The compatibility table in 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
`enabled`	Chrome 45 Disabled 45 Disabled Disabled From version 45: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled` ). To change preferences in Chrome, visit chrome://flags.	Edge 79 Disabled 79 Disabled Disabled From version 79: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled` ). 不支持 12 — 79	Firefox 33	IE 10	Opera 32 Disabled 32 Disabled Disabled From version 32: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled` ).	Safari 6.1	WebView Android 45	Chrome Android 45 Disabled 45 Disabled Disabled From version 45: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled` ). To change preferences in Chrome, visit chrome://flags.	Firefox Android 33	Opera Android 32 Disabled 32 Disabled Disabled From version 32: this feature is behind the `enable-experimental-web-platform-features` preference (needs to be set to `enabled` ).	Safari iOS 7	Samsung Internet Android No

图例

完整支持
不支持
用户必须明确启用此特征。

元数据

最后修改： May 25, 2019

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值

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