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如何使用JavaScript實現倒計時
導語：如何使用JavaScript實現倒計時呢?下面是小編給大家提供的JavaScript常用倒計時實現代碼，大家可以參考閱讀，更多詳情請關注應屆畢業生考試網。
第一種：精確到秒的javascript倒計時代碼
<form name="form1">
<p align="center" align="center">
<center>離2010年還有:<br>
<input type="textarea" name="left" size="35" style="text-align: center">
</center>
</p>
</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, '+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：某某運動會
<!--倒計時Javascript begin-->
<script language="JavaScript">
<!--
function DigitalTime1()
{
var deadline= new Date("08/13/2007") //開幕倒計時
var symbol="8月13日"
var now = new Date()
var diff = -480 - now.getTimezoneOffset() //是北京時間和當地時間的時間差
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") //開幕后計時
var symbol_2="8月13日"
var now_2 = new Date()
var diff_2 = -480 - now.getTimezoneOffset() //是北京時間和當地時間的時間差
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) //還未開幕
{
//LiveClock1.innerHTML = "現在"+symbol+"天"
LiveClock1.innerHTML = "<font
setTimeout("DigitalTime1()",1000)
}
if (day<0) //已經開幕
{
//LiveClock1.innerHTML = "現在離"+symbol+"還有"+day+"天"+hour+"小時"+minute+"分"+second +"秒"
LiveClock1.innerHTML = "<font
setTimeout("DigitalTime1()",1000)
}
if (day==0) //正在開幕
{
//LiveClock1.innerHTML = "現在"+symbol+"天"
LiveClock1.innerHTML = "<font
setTimeout("DigitalTime1()",1000)
}
if (day<0 & day_2>19) //某某運動會結束
{
//LiveClock1.innerHTML = "現在離"+symbol+"還有"+day+"天"+hour+"小時"+minute+"分"+second +"秒"
LiveClock1.innerHTML = "<font
setTimeout("DigitalTime1()",1000)
}
}
// -->
</script>
<!--倒計時Javascript end-->
<body onload=DigitalTime1()>
<p id= LiveClock1></p>
</body>
第三種：小時倒計時
<SCRIPT LANGUAGE="JavaScript">
<!--
var maxtime = 60*60 //一個小時，按秒計算，自己調整!
function CountDown(){
if(maxtime>=0){
minutes = Math.floor(maxtime/60);
seconds = Math.floor(maxtime%60);
msg = "距離結束還有"+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("時間到，結束!");
}
}
timer = setInterval("CountDown()",1000);
//-->
</SCRIPT>
<p id="timer" style="color:red"></p>
第四種：最簡倒計時
<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>現在離2006年"+times+"還有: <font color=#ffffff><b>"+time +"</b></font> 天</font></li>");
// End -->
</Script>
第五種：最簡倒計時
<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>
距某某開幕式還有 [<script language="JavaScript" type="text/javascript">djs()</script>] 天
第五個：Javascript倒計時器 - 采用系統時間自校驗
這次利用系統時間自校驗倒計時, 無需手工調校使得倒計時更為精確, 代碼及詳細注釋如下:
<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;
// 開始運行
function run() {
startB.disabled = true;
endB.disabled = false;
counter = 0;
// 初始化開始時間
startTime = new Date().valueOf();
// nextelapse是定時時間, 初始時為100毫秒
// 注意setInterval函數: 時間逝去nextelapse(毫秒)后, onTimer才開始執行
timer = window.setInterval("onTimer()", nextelapse);
}
// 停止運行
function stop() {
startB.disabled = false;
endB.disabled = true;
window.clearTimeout(timer);
}
window.onload = function() {
endB.disabled = true;
}
// 倒計時函數
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;
// 清除上一次的定時器
window.clearInterval(timer);
// 自校驗系統時間得到時間差, 并由此得到下次所啟動的新定時器的時間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;
// 啟動新的定時器
timer = window.setInterval("onTimer()", nextelapse);
}
</script>
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