倒计时

[javascript]代码库

<script type="text/javascript">
var second=10;
var timer;
function change()
{
  second--;
 
 if(second>-1)
 {
  document.getElementById("second").innerHTML=second;
  timer = setTimeout('change()',1000);//调用自身实现
 }
 else
 {
   clearTimeout(timer);
 }
}
timer = setTimeout('change()',1000);

 
</script>

<script type="text/javascript">   
<!--   
//一个小时，按秒计算，可以自己调整时间
var maxtime = 60*60 
function CountDown()
{   
	if(maxtime>=0)
	{   
		minutes = Math.floor(maxtime/60);   
		seconds = Math.floor(maxtime%60);   
		msg = "距离结束还有 "+minutes+" 分 "+seconds+" 秒";   
		document.all["timer"].innerHTML=msg;   
		if(maxtime == 5*60) alert('注意，还有5分钟!');   
		--maxtime;   
	}   
	else
	{   
		clearInterval(timer);   
		alert("时间到，结束!");   
	}   
}   
timer = setInterval("CountDown()",1000);   
//-->   
</script>