基于javascript实现精确到毫秒的倒计时限时抢购

$(function(){

  function leftTime(){

    var endTime = new Date("2016/5/20,12:00:00");//结束时间

    var curTime = new Date();//当前时间

    var leftTime = parseInt((endTime.getTime() - curTime.getTime())/1000);//获得时间差

    //小时、分、秒需要取模运算

    var d = parseInt(leftTime/(60*60*24));

    var h = parseInt(leftTime/(60*60)%24);

    var m = parseInt(leftTime/60%60);

    var s = parseInt(leftTime%60);

    var ms = parseInt(((endTime.getTime() - curTime.getTime())/100)%10);

    var txt = "剩余："+d+"天"+h+"小时"+m+"分钟"+s+"."+ms+"秒";

    $(".left-time").text(txt);

    if(leftTime<=0){ $(".left-time").text("团购结束");}

  };

  leftTime();

  var set = setInterval(leftTime,100);

});