JS countdown code summary

Author：Eve Cole Update Time：2025-03-27 19:00:03

This article summarizes common JS countdown codes. Share it for your reference. The specific summary is as follows:

The first type: JavaScript countdown code that is accurate to seconds

HTML code:

Copy the code as follows:<form name="form1">

<center>There is still in 2010:<br>

</center>

</div>

</form>

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+'year, '+Monthleft+'month, '+Dateleft+'day, '+Hourleft+'hour, '+Minuteleft+'minute, '+Secondleft+'second'

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>

The second type: a certain sports meeting

HTML code:

Copy the code as follows:

<!--

function DigitalTime1()

{

var deadline= new Date("08/13/2007") // Opening countdown

var symbol="August 13"

var now = new Date()

var diff = -480 - now.getTimezoneOffset() //is the time difference between Beijing time and local time

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") //After opening time

var symbol_2="August 13"

var now_2 = new Date()

var diff_2 = -480 - now.getTimezoneOffset() //is the time difference between Beijing time and local time

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) //Not opened yet

{

//LiveClock1.innerHTML = "Now"+symbol+"day"

LiveClock1.innerHTML = "<font

setTimeout("DigitalTime1()",1000)

}

if (day<0) //It has been opened

{

//LiveClock1.innerHTML = "Now there is still "+day+"day+"day+"hour+"hour+"minute+"minute+"second+"second"

LiveClock1.innerHTML = "<font

setTimeout("DigitalTime1()",1000)

}

If (day==0) //Opening

{

//LiveClock1.innerHTML = "Now"+symbol+"day"

LiveClock1.innerHTML = "<font

setTimeout("DigitalTime1()",1000)

}

if (day<0 & day_2>19) //The sports meeting ends

{

//LiveClock1.innerHTML = "Now there is still "+day+"day+"day+"hour+"hour+"minute+"minute+"second+"second"

LiveClock1.innerHTML = "<font

setTimeout("DigitalTime1()",1000)

}

// -->

</script>

</body>

The third type: hour countdown

HTML code:

Copy the code as follows: <SCRIPT LANGUAGE="JavaScript">

<!--

var maxtime = 60*60 //One hour, calculate in seconds, adjust it yourself!

function CountDown(){

if(maxtime>=0){

minutes = Math.floor(maxtime/60);

seconds = Math.floor(maxtime`);

msg = "There are still "+ minutes + "minutes" + seconds + "seconds" at the end of the distance;

document.all["timer"].innerHTML=msg;

if(maxtime == 5*60) alert('Note, there are 5 minutes left!');

--maxtime;

}

else{

clearInterval(timer);

alert("Time is up, end!");

}

timer = setInterval("CountDown()",1000);

//-->

</SCRIPT>

The fourth type: the simplest countdown

HTML code:

Copy the code as follows:<Script Language="JavaScript">

<!-- Begin

var timedate= new Date("January 14,2006");

var times="graduate exam";

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>Now there is still "+times+" in 2006: <font color=#ffffff><b>"+time +"</b></font> days</font></li>");

// End -->

</Script>

The fifth type: the simplest countdown two

HTML code:

Copy the code as follows:<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>

There are still days before the opening ceremony of a certain person [<script language="JavaScript" type="text/javascript">djs()</script>]

Sixth: Javascript countdown timer - Self-checking of system time

This time, the countdown is checked by self-checking of the system time, and there is no need for manual adjustment to make the countdown more accurate. The code and detailed comments are as follows:

Copy the code as follows:<span id="clock">00:01:11:00</span>

<br>

var normalelapse = 100;

var nextelapse = normalelapse;

var counter;

var startTime;

var start = clock.innerText;

var finish = "00:00:00:00";

var timer = null;

// Start running

function run() {

startB.disabled = true;

endB.disabled = false;

counter = 0;

// Initialization start time

startTime = new Date().valueOf();

// nextelapse is the timing time, initially 100 milliseconds

// Note the setInterval function: Nextelapse (milliseconds) is passed, onTimer starts executing

timer = window.setInterval("onTimer()", nextlapse);

}

// Stop running

function stop() {

startB.disabled = false;

endB.disabled = true;

window.clearTimeout(timer);

}

window.onload = function() {

endB.disabled = true;

}

// Countdown function

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;

// Clear the last timer

window.clearInterval(timer);

// The time difference of self-checking system time is obtained, and thus the time of the new timer that is started next time is obtained nextlapse

counter++;

var counterSecs = counter * 100;

var elapseSecs = new Date().valueOf() - startTime;

var diffSecs = counterSecs - elapseSecs;

nextlapse = normalelapse + diffSecs;

diff.value = counterSecs + "-" + elapseSecs + "=" + diffSecs;

next.value = "nextelapse = " + nextelapse;

if (nextelapse < 0) nextelapse = 0;

// Start a new timer

timer = window.setInterval("onTimer()", nextlapse);

}

</script>

I hope that the description in this article will be helpful to everyone's web programming based on javascript.