js倒计时小程序实现代码

倒计时小程序实现代码，可以精确到天和精确到秒

我们这里只要自己一下s与urodz的值就可以随意定义任何日期或节日的了，各位朋友可加以修改。
精确到天的倒计时

代码如下:

<script>
<!-- // (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！");
// --></script>

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精确到秒的javascript倒计时代码 
HTML代码: 

代码如下:

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离2010年还有:

                    <script> 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>

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