Return the attribute audioTracks of the AudioTrackList object in html5-H5 Tutorial-php.cn

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Return the attribute audioTracks of the AudioTrackList object in html5

黄舟

Nov 08, 2017 am 09:32 AM

h5 html5

Example

Get the number of available audio tracks:

myVid=document.getElementById("video1");
alert(myVid.audioTracks.length);

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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

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##AudioTrackList ObjectAudioTrack object ExampleGet the number of available

Type

Description

indicates the available audio tracks of audio and video.

AudioTrackList object:

audioTracks.length - or the number of available audio tracks
##audioTracks[index] - Get the AudioTrack object by index
Note: The first available AudioTrack object The subscript is 0.

represents the audio track.

AudioTrack object attributes:

id - Get the id of the audio track

kind - Get the type of the audio track ( Can be "alternative", "description", "main", "translation", "commentary", or "" (empty
))
label - Get the tag
language of the audio track - Get the language of the audio track
##enabled - Get or set whether the audio track is active (true |false)

audio

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> 
</html>

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