<script type="text/javascript" language="JavaScript">

    var startTime = new Date();
    var endTime=startTime.getTime()+10*60*1000;
    var g_blinkswitch = 0;
    var g_blinktitle = document.title;
    function getRemainTime(){

        var nowTime = new Date();
        var nMS =endTime - nowTime.getTime();
        var nM=Math.floor(nMS/(1000*60)) % 60;
        var nS=Math.floor(nMS/1000) % 60;
        if(nM==0&&nS==0&&nMS<1000) //當(dāng)?shù)褂?jì)時(shí)結(jié)束
        {
            window.focus();
            setInterval("blinkNewMsg()", 1000);
            window.location.reload();
        }
        if(nS < 10) nS = "0" + nS;

        if(nMS >= 0){
            document.getElementById("remainTime").innerHTML= nM + "分" + nS + "秒";
            setTimeout("getRemainTime()",1000);
        }        
    }    
    function blinkNewMsg()
    {
        document.title = g_blinkswitch % 2==0 ? "【　　　】 - " + g_blinktitle : "【新消息】 - " +
        g_blinktitle;
        g_blinkswitch++;
    }    
 window.onload=getRemainTime;
</script>
<strong id="remainTime">10分00秒</strong>
 

例2

倒計(jì)時(shí)跳轉(zhuǎn)頁面

復(fù)制代碼代碼如下:

<title>JS倒計(jì)時(shí)網(wǎng)頁自動(dòng)跳轉(zhuǎn)代碼</title>   
<script language="JavaScript" type="text/javascript">
 function delayURL(url) {
  var delay = document.getElementById("time").innerHTML;
  if(delay > 0) {
   delay--;
   document.getElementById("time").innerHTML = delay;
  } else {
   window.top.location.href = url;
  }
  setTimeout("delayURL('" + url + "')", 1000);
 }
</script>
<span id="time" style="background: #00BFFF">3</span>秒鐘后自動(dòng)跳轉(zhuǎn)，如果不跳轉(zhuǎn)，請點(diǎn)擊下面的鏈接<a href="http://www.dbjr.com.cn">我的百度</a>
<script type="text/javascript">
delayURL("http://www.dbjr.com.cn");
</script>
 

例3 防刷新的倒計(jì)時(shí)代碼

復(fù)制代碼代碼如下:

 
<!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">  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />  
<title> www.dbjr.com.cn</title>  
</head>  
<body>  
<SCRIPT LANGUAGE="JavaScript">  
<!--  
var maxtime;  
if(window.name==''){   
maxtime = 1*60;  
}else{  
maxtime = window.name;  
}  
function CountDown(){  
if(maxtime>=0){  
minutes = Math.floor(maxtime/60);  
seconds = Math.floor(maxtime%60);  
msg = "距離考試結(jié)束還有"+minutes+"分"+seconds+"秒";  
document.all["timer"].innerHTML = msg;  
if(maxtime == 5*60) alert('注意，還有5分鐘!');  
--maxtime;  
window.name = maxtime;   
}  
else{  
clearInterval(timer);  
alert("考試時(shí)間到，結(jié)束!");  
}  
}  
timer = setInterval("CountDown()",1000);  
//--> 
</SCRIPT>  
<div id="timer" style="color:red"></div>   
</body>  
</html>
 