Return the attribute audioTracks of the AudioTrackList object in html5
Example
Get the number of available audio tracks:
myVid=document.getElementById("video1");
alert(myVid.audioTracks.length);Definition and usage
audioTracks PropertiesReturns the AudioTrackList object.
AudioTrackList object represents the available audio tracks for audio video.
Each available audio track is represented by an AudioTrack object.
Browser support
The audioTracks attribute is not supported by any major browsers.
Syntax
audio|video.audioTracks
| Type | Description |
indicates the available audio tracks of audio and video. AudioTrackList object:
| AudioTrack object |
| represents the audio track. | AudioTrack object attributes: id - Get the id of the audio track | Example
tracks:
<!DOCTYPE html>
<html>
<body>
<p>
<button onclick="getAudioTracks()" type="button">获得可用音轨的数量</button>
</p>
<video id="video1" controls="controls">
<source src="/example/html5/mov_bbb.mp4" type="video/mp4">
<source src="/example/html5/mov_bbb.ogg" type="video/ogg">
您的浏览器不支持 video 标签。
</video>
<script>
var myVid = document.getElementById("video1");
function getAudioTracks() {
alert(myVid.audioTracks.length);
}
</script>
</body>
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