<div id="timer" data-timer="20160628140203" style="font-size:20px">

    剩余天数：

    <span id="timer_d">0</span>天

    <span id="timer_h">0</span>时

    <span id="timer_m">0</span>分

    <span id="timer_s">0</span>秒

</div> 

timer('timer');//调用方法  

//时分秒倒计时方法

function timer(eleId){

    var element=document.getElementById(eleId);

    if(element){

        endTimer=element.getAttribute('data-timer');

        var endTime=new Date(parseInt(endTimer.substr(0,4), 10),parseInt(endTimer.substr(4,2), 10),parseInt(endTimer.substr(6,2), 10),parseInt(endTimer.substr(8,2), 10),parseInt(endTimer.substr(10,2), 10),parseInt(endTimer.substr(12,2), 10));

        var endTimeMonth=endTime.getMonth()-1;

        endTime.setMonth(endTimeMonth);

        var ts = endTime - new Date();

        if(ts>0){

            var dd = parseInt(ts / 1000 / 60 / 60 / 24, 10);

            var hh = parseInt(ts / 1000 / 60 / 60 % 24, 10);

            var mm = parseInt(ts / 1000 / 60 % 60, 10);

            var ss = parseInt(ts / 1000 % 60, 10);

            dd = dd<10?("0" + dd):dd;   //天

            hh = hh<10?("0" + hh):hh;   //时

            mm = mm<10?("0" + mm):mm;   //分

            ss = ss<10?("0" + ss):ss;   //秒

            document.getElementById("timer_d").innerHTML=dd;

            document.getElementById("timer_h").innerHTML=hh;

            document.getElementById("timer_m").innerHTML=mm;

            document.getElementById("timer_s").innerHTML=ss;

            setTimeout(function(){timer(eleId);},1000);

        }else{

            document.getElementById("timer_d").innerHTML=0;

            document.getElementById("timer_h").innerHTML=0;

            document.getElementById("timer_m").innerHTML=0;

            document.getElementById("timer_s").innerHTML=0;

        }

    }

}