<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
<p>
<video src="578df5e1e6953.mp4" controls preload="auto" id="player"></video>
</p>
<input name="submit" type="submit" οnclick="getInfo()">
<p>
<script language="javascript">
var time;
function getInfo(){
var pl=document.getElementById("player");
time = pl.duration;
alert(time);
}
</script>
</p>
</body>
</html>
注意：不支持视频预加载的浏览器不支持此方式
