$(document).ready(function(){

    run(enddate);

});

//定时器

function run(enddate){

    //如果enddate为后台传入的Date类型，这里直接转化为毫秒数

    enddate=new Date(eddate.replace("T"," ").getTime());

    //以500毫秒的速度执行（可以避免方法执行速度慢会影响展示效果的情况）0

    var time = 500;

    setInterval("dateDif('"+enddate+"')",time);

}

//计算时间相差

function dateDif(enddate){

    var date = enddate - new Date().getTime();

    var days    = date / 1000 / 60 / 60 / 24;

    var daysRound   = Math.floor(days);

    var hours    = date/ 1000 / 60 / 60 - (24 * daysRound);

    var hoursRound   = Math.floor(hours);

    var minutes   = date / 1000 /60 - (24 * 60 * daysRound) - (60 * hoursRound);

    var minutesRound  = Math.floor(minutes);

    var seconds   = date/ 1000 - (24 * 60 * 60 * daysRound) - (60 * 60 * hoursRound) - (60 * minutesRound);

    var secondsRound  = Math.floor(seconds);

    var time = "倒计时"+(daysRound+"天"+hoursRound +"时"+minutesRound+"分"+secondsRound+"秒");

    $("#ytime").text(time);

    }