我们这里只要自己定义一下s与urodz的值就可以随意定义任何日期或节日的倒计时功能了，各位朋友可加以修改。
精确到天的倒计时
复制代码 代码如下:
<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
HTML代码:
复制代码 代码如下:
<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>