js倒计时

html

<DIV>
    <span id="t_d">00天</span>
    <span id="t_h">00时</span>
    <span id="t_m">00分</span>
    <span id="t_s">00秒</span>
</DIV>

js  

function getRTime(){
        var EndTime= new Date('2013/05/1 10:00:00'); //截止时间 前端路上 http://www.51xuediannao.com/qd63/
        var NowTime = new Date();
        var t =EndTime.getTime() - NowTime.getTime();
 

        var d=Math.floor(t/1000/60/60/24);
        var h=Math.floor(t/1000/60/60%24);
        var m=Math.floor(t/1000/60%60);
        var s=Math.floor(t/1000%60);

        document.getElementById("t_d").innerHTML = d + "天";
        document.getElementById("t_h").innerHTML = h + "时";
        document.getElementById("t_m").innerHTML = m + "分";
        document.getElementById("t_s").innerHTML = s + "秒";
    }
    setInterval(getRTime,1000);