编写倒计时程序代码

今天小编要和大家分享的是利用C#实现倒计时的功能，希望对大家有所帮助。本实例是通过使用timer组件来实现倒计时功能的，实现步骤如下：（1） 首先创建两个窗体，在Form1窗体上添加一个Button按钮和一个timer组件，用来执行倒计时功能；在Form2中添加一个Label控件，用于显示倒计时。（2） 在Form2窗体中定义一个公共变量curr_time，用于为Label控件赋值，代码如下：Public string curr_time{ Get {Return lable1.Text} Set{ Label1.Text=value }}(3) 在Form1窗体中，首先定义一个TimeSpan类对象，用于设定初始值；其次在Button按钮的Click事件下，激活timer组件，使其开始计时；然后在timer组件的Tick事件下，使用TimeSpan类对象的Subtract方法，在指定时间间隔内循环减1，实现倒计时功能。主要代码如下：Private TimeSpan ts=new TimeSpan(0,5,0)Private Form2 frm=nullPrivate void button1_Click(object sender,System.EventArgs e){ Timer1.Enabled =true Frm=new Form2() Frm.ShowDialog(this)}Private void timer1_Tick(object sender,System.EventArgs e){ String str=ts.Hours.ToString()+”:”+ts.Minutes.ToString()+”:”+ts.Seconds.ToString()Frm.curr_time=strTs=ts.Subtract(new TimeSpan(0,0,1))If(ts.TotalSeconds<0.0){ Time1.Enabled=false} }转至 程序员之家 http://www.sunxin.org

第一种：精确到秒的javascript倒计时代码

HTML代码:

<form name="form1">

<div align="center" align="center">

<center>离2010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 = 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>

第二种：某某运动会

HTML代码:

<!--倒计时Javascript begin-->

<script language="JavaScript">

<!--

function DigitalTime1()

{

var deadline= new Date("08/13/2007") //开幕倒计时

var symbol="8月13日"

var now = new Date()

var diff = -480 - now.getTimezoneOffset() //是北京时间和当地时间的时间差

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") //开幕后计时

var symbol_2="8月13日"

var now_2 = new Date()

var diff_2 = -480 - now.getTimezoneOffset() //是北京时间和当地时间的时间差

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) //还未开幕

{

//LiveClock1.innerHTML = "现在"+symbol+"天"

LiveClock1.innerHTML = "<font

setTimeout("DigitalTime1()",1000)

}

if (day<0) //已经开幕

{

//LiveClock1.innerHTML = "现在离"+symbol+"还有"+day+"天"+hour+"小时"+minute+"分"+second +"秒"

LiveClock1.innerHTML = "<font

setTimeout("DigitalTime1()",1000)

}

if (day==0) //正在开幕

{

//LiveClock1.innerHTML = "现在"+symbol+"天"

LiveClock1.innerHTML = "<font

setTimeout("DigitalTime1()",1000)

}

if (day<0 &day_2>19) //某某运动会结束

{

//LiveClock1.innerHTML = "现在离"+symbol+"还有"+day+"天"+hour+"小时"+minute+"分"+second +"秒"

LiveClock1.innerHTML = "<font

setTimeout("DigitalTime1()",1000)

}

}

// -->

</script>

<!--倒计时Javascript end-->

<body onload=DigitalTime1()>

<div id= LiveClock1></div>

</body>第三种：小时倒计时

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.jsv. 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>

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