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<!DOCTYPE html> 
<html> 
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body> 
<p>本实例中，我们使用 addEventListener() 方法向 video 元素添加了 "onratechange" 事件。 playbackRate 属性用于设置视频的播放速度。</p>
<video id="myVideo" width="320" height="240" autoplay controls>
    <source src="/statics/demosource/movie.mp4" type="video/mp4">
    <source src="/statics/demosource/movie.ogg" type="video/ogg">
    您的浏览器不支持 HTML5 video。
</video><br>
<button onclick="setPlaySpeed()" type="button">设置视频播放速度为慢速</button>
<script>
// 获取 id="myVideo" 的 video 元素
var x = document.getElementById("myVideo");
// 设置当前视频的播放速度为 0.3 (慢速)
function setPlaySpeed() { 
    x.playbackRate = 0.3;
} 
// 向 video 元素中添加 onratechange 事件，如果播放速度改变执行函数
x.addEventListener("ratechange", myFunction);
function myFunction() {
    alert("视频的播放速度已改变");
}
</script> 
</body> 
</html>
 
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