js获取视频时长

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<!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" onclick="getInfo()">      <p>      <script language="javascript">       var time;        function getInfo(){        var pl=document.getElementById("player");    time = pl.duration;       alert(time);     }      </script>      </p>      </body>      </html>  

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