JavaScript实现简单的数字倒计时
编程学习 2021-07-04 21:48www.dzhlxh.cn编程入门
这里给大家总结了一些比较常用的javascript实现的倒计时功能的代码，非常的实用，有需要的小伙伴可以参考下。
这里是一个JavaScript中显示倒计时的方法，从10一秒一秒地往下减直到计时结束（即0），代码如下：
runCount(10);
function runCount(t){
if(t>0){
document.getElementById(‘shownum').innerHTML = t;
t–;
setTimeout(function(){runCount(t);},1000);
}else{
document.getElementById(‘shownum').innerHTML = ‘倒计时结束！';
}
}
运行该js代码前，需要先添加一个id为shownum的div。
js实现动态倒计时功能 * a是从后台接收到的时间戳，需转换成毫秒单位
<div>
距明年还有:
<span id='daya'></span>天
<span id='hoursa'></span>小时
<span id='minua'></span>分
<span id='secoa'></span>秒
</div>
<script type="text/javascript">
/**
*
* copyright WE 2012.7
* js实现动态倒计时功能
* a是从后台接收到的时间戳，需转换成毫秒单位
*
*/
var a=12345678; //以毫秒为单位
function fomtime()
{
a=a-1000;
var b=new Date();
b.setTime(0);
var c=new Date();
c.setTime(a);
var day1=b.getDate(); //为方便调用，把天数、小时等单独定义
var hours1=b.getHours();
var minu1=b.getMinutes();
var seco1=b.getSeconds();
var day2=c.getDate();
var hours2=c.getHours();
var minu2=c.getMinutes();
var seco2=c.getSeconds();
var day=day2-day1;
var hours=hours2-hours1;
var minu=minu2-minu1;
var seco=seco2-seco1;
document.getElementById('daya').innerHTML=day;
document.getElementById('hoursa').innerHTML=hours;
document.getElementById('minua').innerHTML=minu;
document.getElementById('secoa').innerHTML=seco;
setTimeout("fomtime()",1000);
}
fomtime();
</script>
按天倒计时
HTML代码1:
<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>
HTML代码2:
<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
精确到秒的javascript倒计时代码
HTML代码:
<form name="form1">
<div align="center" align="center">
<center>离2013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>
某某运动会，按时间提示不同的阶段
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>
按小时倒计时
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>
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">
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>
以上所述就是本文的全部内容了，希望大家能够喜欢。