Ajax实现无闪烁定时刷新页面实例代码

<script> 
var limit=":" 
if (document.images){ 
var parselimit=limit.split(":"); 
parselimit=parselimit[]*+parselimit[]*; 
} 
function beginrefresh(){ 
if (!document.images) 
return; 
if (parselimit==) 
window.location.reload(); 
else{ 
parselimit-=; 
curmin=Math.floor(parselimit/); 
cursec=parselimit%; 
if (curmin!=) 
curtime=curmin+" min "+cursec+" sec "; 
else 
curtime=cursec+" sec "; 
window.status=curtime; 
setTimeout("beginrefresh()",); 
} 
} 
window.onload=beginrefresh;
</script>