.net动态显示当前时间(客户端javascript)

function Timer(span) 
{ 
var tmp = new Date(); 
var milsecs=Date.parse(tmp.getMonth()+"-"+tmp.getDay()+"-"+tmp.getFullYear()+" "+document.getElementById('lbl_Hour').innerText+":"+document.getElementById('lbl_Minute').innerText+":"+document.getElementById('lbl_Second').innerText); 
var timer = new Date(milsecs+span); 
var seconds,minutes,hours,date; 
if(timer.getSeconds()<10) 
seconds = "0"+timer.getSeconds(); 
else 
seconds = timer.getSeconds(); 
if(timer.getMinutes()<10) 
minutes = "0"+timer.getMinutes(); 
else 
minutes = timer.getMinutes(); 
if(timer.getHours()<10) 
hours = "0"+timer.getHours(); 
else 
hours = timer.getHours(); 
date=timer.getDate(); 
document.getElementById('lbl_Second').innerText = seconds; 
document.getElementById('lbl_Minute').innerText = minutes; 
document.getElementById('lbl_Hour').innerText = hours; 
} 
//得到服务器时间每隔updatespan分钟校验一次，每秒更新一次本地时钟 
function GetServerTime(updatespan) 
{ 
var clientspan = 1*1000; 
//更新本地时钟 
setInterval("Timer("+clientspan+")",clientspan); 
//同步服务器时钟 
setInterval("window.location.href='当前URL'", updatespan); 
}