<form name="form1">  

<div align="center" align="center">  

<center>離2010年還有:<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+'小時(shí), '+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>

第二種：某某運(yùn)動(dòng)會(huì)

HTML代碼:

復(fù)制代碼代碼如下:

<!--倒計(jì)時(shí)Javascript begin-->  

<script language="JavaScript">  

<!--   

function DigitalTime1()  

{   

var deadline= new Date("08/13/2007") //開(kāi)幕倒計(jì)時(shí)  

var symbol="8月13日"

var now = new Date()  

var diff = -480 - now.getTimezoneOffset() //是北京時(shí)間和當(dāng)?shù)貢r(shí)間的時(shí)間差  

var leave = (deadline.getTime() - now.getTime()) + diff*60000

var day = Math.floor(leave / (1000 * 60 * 60 * 24))  

var hour = Math.floor(leave / (1000*3600)) - (day * 24)  

var minute = Math.floor(leave / (1000*60)) - (day * 24 *60) - (hour * 60)  

var second = Math.floor(leave / (1000)) - (day * 24 *60*60) - (hour * 60 * 60) - (minute*60)  

var deadline_2= new Date("08/13/2004") //開(kāi)幕后計(jì)時(shí)  

var symbol_2="8月13日"

var now_2 = new Date()  

var diff_2 = -480 - now.getTimezoneOffset() //是北京時(shí)間和當(dāng)?shù)貢r(shí)間的時(shí)間差  

var leave_2 = (now_2.getTime() - deadline_2.getTime()) + diff_2*60000

var day_2 = Math.floor(leave_2 / (1000 * 60 * 60 * 24))  

var hour_2 = Math.floor(leave_2 / (1000*3600)) - (day_2 * 24)  

var minute_2 = Math.floor(leave_2 / (1000*60)) - (day_2 * 24 *60) - (hour_2 * 60)  

var second_2 = Math.floor(leave_2 / (1000)) - (day_2 * 24 *60*60) - (hour_2 * 60 * 60) - (minute_2*60)  

day=day+1;  

day_2=day_2+1;  

if (day>0) //還未開(kāi)幕  

{  

//LiveClock1.innerHTML = "現(xiàn)在"+symbol+"天"  

LiveClock1.innerHTML = "<font

setTimeout("DigitalTime1()",1000)  

}  

if (day<0) //已經(jīng)開(kāi)幕  

{  

//LiveClock1.innerHTML = "現(xiàn)在離"+symbol+"還有"+day+"天"+hour+"小時(shí)"+minute+"分"+second +"秒"  

LiveClock1.innerHTML = "<font

setTimeout("DigitalTime1()",1000)  

}  

if (day==0) //正在開(kāi)幕  

{  

//LiveClock1.innerHTML = "現(xiàn)在"+symbol+"天"  

LiveClock1.innerHTML = "<font

setTimeout("DigitalTime1()",1000)  

}  

if (day<0 & day_2>19) //某某運(yùn)動(dòng)會(huì)結(jié)束  

{  

//LiveClock1.innerHTML = "現(xiàn)在離"+symbol+"還有"+day+"天"+hour+"小時(shí)"+minute+"分"+second +"秒"  

LiveClock1.innerHTML = "<font

setTimeout("DigitalTime1()",1000)  

}  

}  

// -->  

</script>  

<!--倒計(jì)時(shí)Javascript end-->  

<body onload=DigitalTime1()>  

<div id= LiveClock1></div>  

</body>

第三種：小時(shí)倒計(jì)時(shí)

HTML代碼:

復(fù)制代碼代碼如下:

<SCRIPT LANGUAGE="JavaScript">  

<!--  

var maxtime = 60*60 //一個(gè)小時(shí)，按秒計(jì)算，自己調(diào)整!  

function CountDown(){  

if(maxtime>=0){  

minutes = Math.floor(maxtime/60);  

seconds = Math.floor(maxtime`);  

msg = "距離結(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;  

}  

else{  

clearInterval(timer);  

alert("時(shí)間到，結(jié)束!");  

}  

}  

timer = setInterval("CountDown()",1000);  

//-->  

</SCRIPT>  

<div id="timer" style="color:red"></div>

第四種：最簡(jiǎn)倒計(jì)時(shí)

HTML代碼:

復(fù)制代碼代碼如下:

<Script Language="JavaScript">   

<!-- Begin   

　　var timedate= new Date("January 14,2006");   

　　var times="研究生考試";   

　　var now = new Date();   

　　var date = timedate.getTime() - now.getTime();   

　　var time = Math.floor(date / (1000 * 60 * 60 * 24));   

　　if (time >= 0) ;  

document.write("<li><font color=#DEDBDE>現(xiàn)在離2006年"+times+"還有: <font color=#ffffff><b>"+time +"</b></font> 天</font></li>");  

// End -->  

</Script>

第五種：最簡(jiǎn)倒計(jì)時(shí)二

HTML代碼:

復(fù)制代碼代碼如下:

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

function djs(){  

var urodz= new Date("11/12/2008");　  

var now = new Date();  

var num  

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

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

if (dni >1)　　  

num=dni+1

else if (dni == 1)　num=2　  

else if (dni == 0)　num=1

else num=0　  

document.write(num)　　  

}  

</script>  

距某某開(kāi)幕式還有 [<script language="JavaScript" type="text/javascript">djs()</script>] 天

第六個(gè)：Javascript倒計(jì)時(shí)器 - 采用系統(tǒng)時(shí)間自校驗(yàn)

這次利用系統(tǒng)時(shí)間自校驗(yàn)倒計(jì)時(shí), 無(wú)需手工調(diào)校使得倒計(jì)時(shí)更為精確, 代碼及詳細(xì)注釋如下:

復(fù)制代碼代碼如下:

<span id="clock">00:01:11:00</span>  

<input id="startB" type="button" value="start countdown!" onclick="run()">  

<input id="endB" type="button" value="stop countdown!" onclick="stop()">  

<br>  

<input id="diff" type="text">  

<input id="next" type="text">  

<script language="Javascript">  

var normalelapse = 100;  

var nextelapse = normalelapse;  

var counter;   

var startTime;  

var start = clock.innerText;   

var finish = "00:00:00:00";  

var timer = null;  

// 開(kāi)始運(yùn)行  

function run() {  

startB.disabled = true;  

endB.disabled = false;  

counter = 0;  

// 初始化開(kāi)始時(shí)間  

startTime = new Date().valueOf();  

// nextelapse是定時(shí)時(shí)間, 初始時(shí)為100毫秒  

// 注意setInterval函數(shù): 時(shí)間逝去nextelapse(毫秒)后, onTimer才開(kāi)始執(zhí)行  

timer = window.setInterval("onTimer()", nextelapse);   

}  

// 停止運(yùn)行  

function stop() {  

startB.disabled = false;  

endB.disabled = true;  

window.clearTimeout(timer);  

}  

window.onload = function() {  

endB.disabled = true;  

}  

// 倒計(jì)時(shí)函數(shù)  

function onTimer()  

{  

if (start == finish)  

{  

window.clearInterval(timer);  

alert("time is up!");  

return;  

}  

var hms = new String(start).split(":");  

var ms = new Number(hms[3]);  

var s = new Number(hms[2]);  

var m = new Number(hms[1]);  

var h = new Number(hms[0]);  

ms -= 10;  

if (ms < 0)  

{  

ms = 90;  

s -= 1;  

if (s < 0)  

{  

    s = 59;  

    m -= 1;  

}  

if (m < 0)  

{  

    m = 59;  

    h -= 1;  

}  

}  

var ms = ms < 10 ? ("0" + ms) : ms;  

var ss = s < 10 ? ("0" + s) : s;  

var sm = m < 10 ? ("0" + m) : m;  

var sh = h < 10 ? ("0" + h) : h;  

start = sh + ":" + sm + ":" + ss + ":" + ms;  

clock.innerText = start;  

// 清除上一次的定時(shí)器  

window.clearInterval(timer);  

// 自校驗(yàn)系統(tǒng)時(shí)間得到時(shí)間差, 并由此得到下次所啟動(dòng)的新定時(shí)器的時(shí)間nextelapse  

counter++;   

var counterSecs = counter * 100;  

var elapseSecs = new Date().valueOf() - startTime;  

var diffSecs = counterSecs - elapseSecs;  

nextelapse = normalelapse + diffSecs;  

diff.value = counterSecs + "-" + elapseSecs + "=" + diffSecs;  

next.value = "nextelapse = " + nextelapse;  

if (nextelapse < 0) nextelapse = 0;  

// 啟動(dòng)新的定時(shí)器  

timer = window.setInterval("onTimer()", nextelapse);   

}  

</script>