//带天数的倒计时 function countDown(times){    var timer=null;    timer=setInterval(function(){        var day=0,            hour=0,            minute=0,            second=0;//时间默认值        if(times > 0){            day = Math.floor(times / (60 * 60 * 24));            hour = Math.floor(times / (60 * 60)) - (day * 24);            minute = Math.floor(times / 60) - (day * 24 * 60) - (hour * 60);            second = Math.floor(times) - (day * 24 * 60 * 60) - (hour * 60 * 60) - (minute * 60);        }        if (day <= 9) day = '0' + day;        if (hour <= 9) hour = '0' + hour;        if (minute <= 9) minute = '0' + minute;        if (second <= 9) second = '0' + second;        //        console.log(day+"天:"+hour+"小时："+minute+"分钟："+second+"秒");        times--;    },1000);    if(times<=0){        clearInterval(timer);    }}

//单纯分钟和秒倒计时function resetTime(time){    var timer=null;    var t=time;    var m=0;    var s=0;    m=Math.floor(t/60%60);    m<10&&(m='0'+m);    s=Math.floor(t%60);    function countDown(){      s--;      s<10&&(s='0'+s);      if(s.length>=3){        s=59;        m="0"+(Number(m)-1);      }      if(m.length>=3){        m='00';        s='00';        clearInterval(timer);      }      console.log(m+"分钟"+s+"秒");    }    timer=setInterval(countDown,1000);}