转自：http://bbs.blueidea.com/thread-3005624-1-1.html （kele5240回复）
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>
untitled
</title>
<script type="text/javascript">
get = function(id) {
return document.getElementById(id)
}
if (document.all) {
window.XMLHttpRequest = function() {
var get = ['Microsoft.XMLHTTP', 'Msxml2.XMLHTTP'];
for (var i = 0; i < get.length; i++) {
try {
return new ActiveXObject(get[i])
} catch(e) {}
};
};
}
webDate = function(fn) {
var Htime = new XMLHttpRequest();
Htime.onreadystatechange = function() {
Htime.readyState == 4 && (fn(new Date(Htime.getResponseHeader('Date'))))
};
Htime.open('HEAD', '/?_=' + ( - new Date));
Htime.send(null);
}
window.time = new Date();
targetTime = new Date();
time2String = function(t) {
with(t) return [getFullYear(), '年', ('0' + (getMonth() + 1)).slice( - 2), '月', ('0' + getDate()).slice( - 2), '日 ', ('0' + getHours()).slice( - 2), ': ', ('0' + getMinutes()).slice( - 2), ': ', ('0' + getSeconds()).slice( - 2)].join('')
}
int2time = function(m) {
m -= (D = parseInt(m / 86400000)) * 86400000;
m -= (H = parseInt(m / 3600000)) * 3600000;
S = parseInt((m -= (M = parseInt(m / 60000)) * 60000) / 1000);
return D + '天' + H + '小时' + M + '分' + S + '秒'
}
setInterval(function() {
webDate(function(webTime) {
get('web').innerHTML = time2String(time = webTime);
}) get('locale').innerHTML = time2String(new Date);
get('time').innerHTML = int2time(targetTime - time);
if ((targetTime - time) < 0) {
get('time').innerHTML = 'Game Over';
}
},
1000)
</script>
</head>
<body>
设定时间：2012年12月31日0时0分0秒
<br>
服务器时间:
<span id='web'>
loading...
</span>
<br>
本地时间:
<span id="locale">
loading...
</span>
<br>
倒计时时间:
<span id="time">
loading...
</span>
<script type="text/javascript" charset="utf-8">
targetTime = new Date(2012, 12, 31, 00, 00, 00);
</script>
</body>
</html>