js倒计时小插件（兼容大部分浏览器）

精确到天的倒计时

<script language="JavaScript">

<!-- // (c) Henryk Gajewski

var urodz= new Date("09/19/2013");

var  s="中秋节";

var now = new Date();

var ile = urodz.getTime() - now.getTime();

var dni = Math.floor(ile / (1000 * 60 * 60 * 24));

if (dni > 1)

   document.write(""+s+"还有"+dni +"天")

else if (dni == 1)

     document.write("只有2天啦！")

else if (dni == 0)

     document.write("只有1天啦！")

else

    document.write("好象已经过了哦！");

// --> 

精确到秒的javascript倒计时代码

<form name="form1">   

<div align="center" align="center">   

<center>离2010年还有:<br>   

<input type="textarea" name="left" size="35" style="text-align: center">   

</center>   

</div>   

</form>   

<script LANGUAGE="javascript">   

startclock()   

var timerID = null;   

var timerRunning = false;   

function showtime() {   

Today = new Date();   

var NowHour = Today.getHours();   

var NowMinute = Today.getMinutes();   

var NowMonth = Today.getMonth();   

var NowDate = Today.getDate();   

var NowYear = Today.getYear();   

var NowSecond = Today.getSeconds();   

if (NowYear <2000)   

NowYear=1900+NowYear;   

Today = null;   

Hourleft = 23 - NowHour   

Minuteleft = 59 - NowMinute   

Secondleft = 59 - NowSecond   

Yearleft = 2009 - NowYear   

Monthleft = 12 - NowMonth - 1 

Dateleft = 31 - NowDate   

if (Secondleft<0)   

{   

Secondleft=60+Secondleft;   

Minuteleft=Minuteleft-1;   

}   

if (Minuteleft<0)   

{    

Minuteleft=60+Minuteleft;   

Hourleft=Hourleft-1;   

}   

if (Hourleft<0)   

{   

Hourleft=24+Hourleft;   

Dateleft=Dateleft-1;   

}   

if (Dateleft<0)   

{   

Dateleft=31+Dateleft;   

Monthleft=Monthleft-1;   

}   

if (Monthleft<0)   

{   

Monthleft=12+Monthleft;   

Yearleft=Yearleft-1;   

}   

Temp=Yearleft+'年, '+Monthleft+'月, '+Dateleft+'天, '+Hourleft+'小时, '+Minuteleft+'分, '+Secondleft+'秒' 

document.form1.left.value=Temp;   

timerID = setTimeout("showtime()",1000);   

timerRunning = true;   

}   

var timerID = null;   

var timerRunning = false;   

function stopclock () {   

if(timerRunning)   

clearTimeout(timerID);   

timerRunning = false;   

}   

function startclock () {   

stopclock();   

showtime();   

}   

// -->   

</script>