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countdown.html
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<!DOCTYPE html>
<html>
<head>
<title>倒计时加载页面</title>
<meta http-equiv='refresh' content="11;url=http://www.google.com">
<script language="JavaScript">
//获取当前时间
startday=new Date();
clockStart = startday.getTime();
function initStopwatch(){
var myTime = new Date();
var timeNow = myTime.getTime();
var timeDiff = timeNow-clockStart; //获取间隔时间
this.diffSecs = timeDiff/1000; //时间以毫秒为单位
return(this.diffSecs);
}
function getSecs(){
var mySecs = initStopwatch();
var mySecs1 = " "+mySecs;
//以倒计时方式显示时间
mySecs1 = 10-document.getElementById(mySecs1.substring(0,mySecs1.indexOf(".")))+"秒";
document.form1.timespent.value = mySecs1;
window.setTimeout('getSecs()',1000);
}
</script>
</head>
<body onLoad="window.setTimeout('getSecs()',1)">
<!--倒计时，并自动加载页面
-->
<center>
10秒后加载页面
<form name="form1">
<input size=9 name="timespent">
</form>
</center>
</body>
</html>