一个关于js代码如何获取服务器时间问题

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<!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>
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