JS 倒计时

function GetRTime() {
        var EndTime = new Date('2016/03/02 10:00:00');
        var NowTime = new Date();
        var t = EndTime.getTime() - NowTime.getTime();
        var d = 0;
        var h = 0;
        var m = 0;
        var s = 0;
        if (t >= 0) {
            d = Math.floor(t / 1000 / 60 / 60 / 24);
            h = Math.floor(t / 1000 / 60 / 60 % 24);
            m = Math.floor(t / 1000 / 60 % 60);
            s = Math.floor(t / 1000 % 60);
        }


        document.getElementById("t_d").innerHTML = d;
        document.getElementById("t_h").innerHTML = h;
        document.getElementById("t_m").innerHTML = m;
        document.getElementById("t_s").innerHTML = s;
    }
    setInterval(GetRTime, 0);