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代碼由meizz(梅花雪)提出，原文見：
http://community.csdn.net/Expert/topic/3796/3796743.xml?temp=.7776605
time.asp
<html><head>
<script language=javascript>
//特別註明：北京時間是格林尼治標準時加八小時，因此我用的起始時間也是從八點起算的
var secondServer = <%=DateDiff("s", "1970-01-01 08:00:00", Now())%>;
var secondClient = parseInt(new Date().getTime()/1000);
var secondSub = secondServer - secondClient; //兩端時間秒差
function meizzTime(n)
{
var mei = new Date();
mei.setTime(mei.getTime() + n*1000); //得到一個新的時間
var h = (mei.getHours() > 9) ? mei.getHours() : "0" + mei.getHours();
var m = (mei.getMinutes() > 9) ? mei.getMinutes() : "0" + mei.getMinutes();
var s = (mei.getSeconds() > 9) ? mei.getSeconds() : "0" + mei.getSeconds();
document.meizz.clock.value = h +":"+ m +":"+ s;
setTimeout("meizzTime(secondSub)", 1000);
}
</script>
<meta http-equiv='Content-Type' content='text/html; charset=gb2312'>
<meta http-equiv="refresh" content="1000">
<title>取伺服器端時間（秒數）</title>
</head>
<body onload="meizzTime(secondSub)">
<form name=meizz><input name=clock size=8></form>
</body></html>
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