代码：

js:

function countDown(time, id) {  //time的格式yyyy/MM/dd hh:mm:ss

    var day_elem = $(id).find('.day');

    var hour_elem = $(id).find('.hour');

    var minute_elem = $(id).find('.minute');

    var second_elem = $(id).find('.second');

    var end_time = new Date(time).getTime(), //月份是实际月份-1

    sys_second = (end_time - new Date().getTime()) / 1000;

    var timer = setInterval(function () {

        if (sys_second > 1) {

            sys_second -= 1;

            var day = Math.floor((sys_second / 3600) / 24);

            var hour = Math.floor((sys_second / 3600) % 24);

            var minute = Math.floor((sys_second / 60) % 60);

            var second = Math.floor(sys_second % 60);

            day_elem && $(day_elem).text(day); //计算天

            $(hour_elem).text(hour < 10 ? "0" + hour : hour); //计算小时

            $(minute_elem).text(minute < 10 ? "0" + minute : minute); //计算分钟

            $(second_elem).text(second < 10 ? "0" + second : second); //计算秒杀

        } else {

            clearInterval(timer);

        }

    }, 1000);

}

 

html:

　　<p id="colockbox">

              <span class="day" id="day">00</span>

　　　　　<span class="hour">00</span>:

              <span  class="minute">24</span>:

　　　　　<span class="second">24</span>

      </p>