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

defaultPlaybackRate属性; 设置或返回视频、声频的默认播放速度

使用defaultPlaybackRate属性设置或返回视频、声频的默认播放速度。注意:该属性不是改变当前播放速度状态的属性, 如果要改变当前播放速度,请使用playbackRate属性

属性值及其说明
说明
播放速度 指定声频、视频的默认播放速度,值:
  • 1.0:标准速度
  • 0.5:半速(慢速)
  • 2.0:倍速(快速)
  • -1.0:后退,以标准速度后退
  • -0.5:后退,以半速后退
false 声频、视频的静音不设为默认值
返回值 数值,默认的播放速度
JavaScript 语法:audio/video.defaultPlaybackRate=播放速度
默认值:1.0

使用例


<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>Insert title here</title>

</head>

<body>

<button onclick="getPlaySpeed()" type="button">默认播放速度?</button>

<button onclick="setPlaySpeed()" type="button">设置视频慢速播放</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 getPlaySpeed() {

alert(vid.defaultPlaybackRate);

}

function setPlaySpeed() {

vid.defaultPlaybackRate = 0.5;

vid.load();

}

</script>

</body>

</html>

不同浏览器的对应情况

属性
defaultPlaybackRate 9.0 yes 20.0 X yes