JS案例：退出页面时显示浏览当前页面的时间

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>统计浏览某页面所用的时间</title>
</head>
<body bgcolor="#fef4d2" onload=Timetrack()>
<br>
<center>
<font color="ffaafa"><h2>浏览某页所用时间</h2></font>
<hr width=300>
<br>
<script type="text/javascript">
	var entered = new Date()
	function Timetrack(){
	var now = new Date()
	var seconds = Math.floor((now.getTime() - entered.getTime()) / 1000)
	var minutes = Math.floor(seconds /60)
	var second = seconds % 60
	var minute = minutes % 60
	document.time.timer.value = minutes + ":" + seconds
	var timeID= setTimeout("Timetrack()",1000)
}
</script>
<table >
  <tr>
    <td WIDTH="100%">
	 <font FACE="ARIEL,HELVETICA" SIZE="-1">	
      <form name="time">
         <div align="center"><center>
        <p>浏览本页总共用去<input type="text" name="timer"  size="6" value="0:00"> 秒.</p>
       </center></div>
      </form> 
	 </font>
	</td>
  </tr>
</table>
</body>
</html>
取自“http://www.openbrains.net/mediawiki/index.php?title=JS案例：退出页面时显示浏览当前页面的时间&oldid=16241”