js实现是倒计时功能

浏览数：18 / 时间：2015年06月09日

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>