Audio/Video

Audio/Video 方法

addTextTrack() canPlayType() load() play() pause()

Audio/Video 属性

audioTracks autoplay buffered controller controls crossOrigin currentSrc currentTime defaultMuted defaultPlaybackRate duration ended error loop mediaGroup muted networkState paused playbackRate played readyState readyState seekable seeking src startDate textTracks videoTracks volume

Audio/Video 事件

onabort oncanplay oncanplaythrouth ondurationchange emptied onended onerror onloadeddata onloadedmetadata onloadstart onpause onplay onplaying onprogress onratechange onseeked onseeking onstalled onsuspend ontimeupdate onvolumechange onwaiting

JavaScript对象

基础内容

基础

HTML DOM

DOM Document DOM Elements DOM Attributes DOM Events

浏览器BOM

Window Navigator Screen History Location

html对象

a abbr address area article aside audio b base bdo blockquote body br button canvas caption cite code col colgroup datalist dd del details dfn dialog div dl dt em embed fieldset figcaption figure footer form h1~h6 head hr html i iframe img input button input checkbox input color input date input datetime input datetime-local input email input file input hidden input image input month input number input password input radio input range input reset input search input submit input text input time input url input week ins kbd keygen label legend li link map mark menu meta meter nav object ol optgroup option output p param pre progress q s samp script scetion select small source span strong style

audioTrack属性 返回AudioTracklist对象

使用audioTrack属性返回AudioTracklist对象。AudioTracklist对象代表了可利用的,声频、视频的轨道。每个可利用的轨道文件由一个AudioTrack对象代表。

属性值及其说明
说明
AudioTrackList 为视频、声频指定有效的声音轨道。AudioTrackList 对象:
  • audioTracks.length:获取有效的声音轨道序号。
  • audioTracks.getTrackById(id):通过id获得AudioTrack对象
  • audioTracks[index]:以索引的方式,获得AudioTrack对象
注:索引值以0开始
AudioTrack 代表一个声音轨道。AudioTrack对象的属性:
  • id:获得音轨的id
  • kind:获得音轨的类型( "alternative", "description", "main", "translation", "commentary", or "" (空字符))
  • label:获得音轨的标签
  • language:获得音轨的语言类型
  • enabled:如果音轨可用获得或设置(true/false)
JavaScript 语法:audio/video.audioTracks;

使用例


<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>Insert title here</title>

</head>

<body>

<button onclick="myFunction()" type="button">获得可用音轨的数量</button><br>

<video id="video1" width="480" height="270" controls="controls">

<source src="material/sample.mp4" type="video/mp4"/>

<source src="material/sample.ogv" type="video/ogg"/>

你的浏览器不支持HTML5 video.

</video>

<script>

var vid = document.getElementById("video1");

function myFunction() {

alert(vid.audioTracks.length);

}

</script>

</body>

</html>

不同浏览器的对应情况

属性
audioTrack 11 X X X X