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js实现是倒计时功能

工作中经常用到倒计时的功能,最近在整理之前做的项目的时候,发现自己写过一个倒计时的功能的效果,这里和大家分享下!实现这个功能是用原生js写的,不需要加载额外的库文件!功能比较简单,但是可以在此基础上扩展程序,得到想要的效果!

这里附上效果图先:

效果比较简单,只是简单的加了下样式!

代码如下:

<!DOCTYPE html><html><head>    <meta charset="utf-8">    <title>倒计时功能</title>    <style type="text/css">       #box{width:300px; height:60px; background:#000;margin:0 auto;}       #box ul{margin:0; padding:0;width:300px; height:60px; clear:both;}       #box ul li{list-style:none; float:left;width:100px; height:60px; text-align:center; font:40px/60px 微软雅黑; color:#fff;}       .fr{float:right;}    </style></head><body>  <div id="box">      <ul>         <li id="hourseCon">00</li>         <li id="minuteCon">00</li>         <li id="secondCon">00</li>      </ul>  </div></body></html><script type="text/javascript">window.onload = function(){var timer;function ShowCountDown(year,month,day,hourss) {    var now = new Date()    var endDate = new Date(year, month-1, day ,hourss);    var leftTime=parseInt(endDate.getTime())-parseInt(now.getTime());    if(leftTime <= 0)    {      leftTime = 0;    }    var leftsecond = parseInt(leftTime/1000);    var hour = Math.floor(leftsecond/3600).toString();     var minute = Math.floor((leftsecond-hour*3600)/60).toString();    var second = Math.floor(leftsecond-hour*3600-minute*60).toString();    var getHourseC = document.getElementById("hourseCon");    var getMinuteC = document.getElementById("minuteCon");    var getSecongC = document.getElementById("secondCon");    getHourseC.innerHTML = (hour.length < 2) ? 0+ hour : hour;    getMinuteC.innerHTML = (minute.length < 2) ? 0+ minute : minute;    getSecongC.innerHTML = (second.length < 2) ? 0+ second : second;}//开启计时功能//timestring 时间戳(这里传过来的是2014-9-25) hours是截止的时间(这里以小时为例)function startCount(timestring,hours){       var timef = timestring.toString();       var ss = [];       ss = timef.split("-");       var year = ss[0];       var month = ss[1];       var day = ss[2];       var hour = hours;       timer = window.setInterval(function()            {               day = parseInt(ss[2]);               ShowCountDown(year,month,day,hour);               var hourhtml = document.getElementById("hourseCon").innerHTML;               var minutehtml = document.getElementById("minuteCon").innerHTML;               var secondhtml = document.getElementById("secondCon").innerHTML;                //倒计时结束                  if(hourhtml == 00 && minutehtml == 00 && secondhtml == 00)                   {                       window.clearInterval(timer);                   }            }, 1000);    }    startCount(2014-9-28,16);}</script>

上面的js做了一点简单的处理,当位数只有1位的时候会在前面自动补0!

js实现是倒计时功能