javascript 四种倒计时效果实例 附完整源码下载

【实例简介】

秒级倒计时、简约倒计时、奥运会倒计时等四种实例代码
【实例截图】

【核心代码】
倒计时一：

<form name="form1">   
<div align="center" align="center">   
<center>离2014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 = 2014 - 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>   

倒计时二：

<SCRIPT LANGUAGE="JavaScript">   
<!--   
var maxtime = 60*60 //一个小时，按秒计算，自己调整!   
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>   
<div id="timer" style="color:red"></div>   

倒计时三：

<Script Language="JavaScript">    
<!-- Begin    
　　var timedate= new Date("January 14,2016");    
　　var times="研究生考试";    
　　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>现在离2016年" times "还有: <font color=red><b>" time  "</b></font> 天</font></li>");   
// End -->   
</Script>   

倒计时四：

<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">   
/* This notice must be untouched at all times. 

countdown.js    v. 1.0 
The latest version is available at 
http://blog.csdn.net/yjgx007 

Copyright (c) 2004 Xinyi.Chen. All rights reserved. 
Created 7/30/2004 by Xinyi.Chen.   
Web: http://blog.csdn.net/yjgx007 
E-Mail: chenxinyi1978@hotmail.com 
Last modified: 7/30/2004 

This program is free software; 
you can redistribute it and/or modify it under the terms of the 
GNU General Public License as published by the Free Software Foundation; 

See the GNU General Public License 
at http://www.gnu.org/copyleft/gpl.html for more details. 
*/ 
var normalelapse = 100;   
var nextelapse = normalelapse;   
var counter;    
var startTime;   
var start = clock.innerText;    
var finish = "00:00:00:00";   
var timer = null;   

// 开始运行   
function run() {   
startB.disabled = true;   
endB.disabled = false;   
counter = 0;   
// 初始化开始时间   
startTime = new Date().valueOf();   

// nextelapse是定时时间, 初始时为100毫秒   
// 注意setInterval函数: 时间逝去nextelapse(毫秒)后, onTimer才开始执行   
timer = window.setInterval("onTimer()", nextelapse);    
}   

// 停止运行   
function stop() {   
startB.disabled = false;   
endB.disabled = true;   
window.clearTimeout(timer);   
}   

window.onload = function() {   
endB.disabled = true;   
}   

// 倒计时函数   
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;   

// 清除上一次的定时器   
window.clearInterval(timer);   

// 自校验系统时间得到时间差, 并由此得到下次所启动的新定时器的时间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;   

// 启动新的定时器   
timer = window.setInterval("onTimer()", nextelapse);    
}   
</script>