JavaScript實現簡單的數字倒計時_javascript技巧

這裡是一個JavaScript中顯示倒計時的方法，從10一秒一秒地往下減直到計時結束（即0），代碼如下：

runCount(10);function runCount(t){  if(t>0){    document.getElementById(‘shownum').innerHTML = t;    t–;    setTimeout(function(){runCount(t);},1000);  }else{    document.getElementById(‘shownum').innerHTML = ‘倒計時結束！';  }}

　　運行該js代碼前，需要先添加一個id為shownum的div。

js實現動態倒計時功能 * a是從後台接收到的時間戳記，需轉換成毫秒單位

<div>  距明年還有:  <span id='daya'></span>天  <span id='hoursa'></span>小時  <span id='minua'></span>分  <span id='secoa'></span>秒</div><script type="text/javascript">/****  copyright WE 2012.7*  js實現動態倒計時功能*  a是從後台接收到的時間戳記，需轉換成毫秒單位**/  var a=12345678;     //以毫秒為單位  function fomtime()  {    a=a-1000;    var b=new Date();    b.setTime(0);    var c=new Date();    c.setTime(a);    var day1=b.getDate();    //為方便調用，把天數、小時等單獨定義    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>

按天倒計時

HTML代碼1:

<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> 

HTML代碼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> 

距某某開幕式還有 [<script language="JavaScript" type="text/javascript">djs()</script>] 天
精確到秒的javascript倒計時代碼

HTML代碼:

<form name="form1"> <div align="center" align="center"> <center>離2013年還有:<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> 

某某運動會，按時間提示不同的階段

HTML代碼:

<!--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") //開幕後計時  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()> <div id= LiveClock1></div> </body>

按小時倒計時

HTML代碼:

<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> <div id="timer" style="color:red"></div> 

Javascript倒計時器 - 採用系統時間自校正

這次利用系統時間自校正倒計時, 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)後, 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);  // 自校正系統時間得到時間差, 並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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