JS倒计时代码

JS倒计时代码
HTML代码:
<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>

第四种：最简倒计时

HTML代码:
<Script Language="JavaScript">
<!-- Begin
　　var timedate= new Date("January 14,2006");
　　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2006年"+times+"还有: <font color=#ffffff><b>"+time +"</b></font> 天</font></li>");
// End -->
</Script>

第五种：最简倒计时二

HTML代码:
<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>

距某某开幕式还有 [<script language="JavaScript" type="text/javascript">djs()</script>] 天
第五个：Javascript倒计时器 - 采用系统时间自校验
这次利用系统时间自校验倒计时, 无需手工调校使得倒计时更为精确, 代码及详细注释如下:

<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">
/* 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>
第六种：在线考试javaScript倒计时

<script type="text/javascript">
/*
================== hi.baidu.com/coolinc ===
*/

var h=0; //设置考试时间(小时单位)
var m=0.1; //设置考试时间(分钟单位)
var timeShowId="timeshow"; //设置时间显示层ID
var TimeNum=h*60*60+m*60;
var timeStr;
function ChangeTime(){
TimeNum--;
if(TimeNum > 0){
timeStr=setTimeout("ChangeTime()",1000);
}
else{
document.form1.submit();
}
document.getElementById(timeShowId).innerHTML="在线考试系统提示你的时间还剩"+Math.floor(TimeNum/60)+"分"+TimeNum%60+"秒";
//window.status="在线考试系统提示你的时间还剩"+Math.floor(TimeNum/60)+"分"+TimeNum%60+"秒";
}
</script>
<body onLoad="ChangeTime()">
<div id="timeshow" style="position:absolute;left:1px;top:1px;width:250px;height:20px;line-height:20px;text-align:center;font-size:12px;color:#000;background-color:#CCC;border:1px solid #333;"></div>
<br />
<form action="NS_Exam_result.asp" method="post" name="form1" id="form1">
...做题
<input type="submit" name="Submit" value="交卷">
</form>
</body>