基于服务器事件的时钟

<span id="curTime"></span>
<script type="text/javascript"><!--
// 页面要开始计时的日期（一般是服务器日期）,比如2007-01-12 11:34:55开始计时
var beginAdd = new Date(2007,0,12,11,34,55);
var beginDate = new Date();
    function ShowTime() {
     var now = new Date();
     var diff = (now - beginDate);
     beginAdd.setMilliseconds(beginAdd.getMilliseconds() + diff);
     beginDate = now;
document.getElementById("curTime").innerHTML = beginAdd.toLocaleString()+' 星期'+'日一二三四五六'.charAt(beginAdd.getDay());
}
    setInterval("ShowTime();",1000);
// --></script>


http://www.cnblogs.com/leadzen/archive/2008/02/25/1073404.html