HTMLMediaElement.audioTracks - Web APIs 编辑

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The read-only audioTracks property on HTMLMediaElement objects returns an AudioTrackList object listing all of the  AudioTrack objects representing the media element's audio tracks. The media element may be either an <audio> element or a <video> element.

The returned list is live; that is, as tracks are added to and removed from the media element, the list's contents change dynamically. Once you have a reference to the list, you can monitor it for changes to detect when new audio tracks are added or existing ones removed. See Event handlers in AudioTrackList to learn more about watching for changes to a media element's track list.

Syntax

var audioTracks = mediaElement.audioTracks;

Value

A AudioTrackList object representing the list of audio tracks included in the media element. The list of tracks can be accessed using array notation, or using the object's getTrackById() method.

Each track is represented by a AudioTrack object which provides information about the track.

Examples

In this example, all of the audio tracks on a given element are muted.

HTML

The HTML establishes the element itself.

<video id="video" src="somevideo.mp4"></video>

JavaScript

The JavaScript code handles muting the video element's audio tracks.

var video = document.getElementById("video");

for (var i = 0; i < video.audioTracks.length; i += 1) {
  video.audioTracks[i].enabled = false;
}

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• The interface defining it, HTMLMediaElement.
• <audio> and <video>
• AudioTrack and AudioTrackList