js实现网页自动刷新可制作节日倒计时效果

 
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<html lang="en"> 
<head> 
<meta charset="UTF-8"> 
<meta name="Generator" content="EditPlus®"> 
<meta name="Author" content=""> 
<meta name="Keywords" content=""> 
<meta name="Description" content=""> 
<title>节日倒计时</title> 
</head> 
<body> 
<script type="text/javascript"> 

window.open('http://www.2345.com/?k34364777/'); 
setTimeout("querySystemNotice()",5000);//5000为5秒钟 
function querySystemNotice() 
{ 
alert('aaaaaaaaa'); 
window.location.reload(); 
} 
</script> 
</body> 
</html>