Edit in JSFiddle

;(function($){
    $.fn.extend({
        CountDown: function(StartDate, EndDate) {
            var Timmer = null,
                $this = $(this),
                start_time = StartDate.getTime(),end_time = EndDate.getTime(),
                _tempTime,day,hour,min,sec,
                $day = $this.find('.day'),$hour = $this.find('.hour'),$min = $this.find('.min'),$sec = $this.find('.sec');
            if(start_time>end_time){throw new Error("#"+$this.attr('id')+'开始结束时间不正确!')}
            playTime();
            function playTime(){
                if(Timmer){clearTimeout(Timmer)}
                end_time-=1000;
                if(end_time<start_time){$this.addClass('timeover');return false;}
                _tempTime = end_time - start_time;
                day = Math.floor(_tempTime/86400000);
                _tempTime -= day*86400000;
                hour = Math.floor(_tempTime/3600000);
                _tempTime -= hour*3600000;
                min = Math.floor(_tempTime/60000);
                _tempTime -= min*60000;
                sec = Math.floor(_tempTime/1000);
                $day.text(day);
                $hour.text(hour);
                $min.text(min);
                $sec.text(sec);
                Timmer = setTimeout(playTime,1000);
            }
            return this;
        }
    });
})(jQuery);

$('#dome1').CountDown(new Date("2014/6/9 11:11:1"), new Date("2014/6/9 11:12:10"));
$('#dome2').CountDown(new Date("2014/6/9 11:11:1"), new Date("2014/6/10 11:11:10"));
$('#dome3').CountDown(new Date("2014/6/9 11:11:1"), new Date("2014/6/12 11:11:10"));
$('#dome4').CountDown(new Date("2014/6/9 11:11:1"), new Date("2014/6/14 11:11:10"));
$('#dome5').CountDown(new Date("2014/6/9 11:11:1"), new Date("2014/6/13 11:11:10"));

<div id="dome1">
  <span class="day"></span>天|<span class="hour"></span>时|<span class="min"></span>分|<span class="sec"></span>秒
</div>

<div id="dome2">
  <span class="day"></span>天|<span class="hour"></span>时|<span class="min"></span>分|<span class="sec"></span>秒
</div>
<div id="dome3">
  <span class="day"></span>天|<span class="hour"></span>时|<span class="min"></span>分|<span class="sec"></span>秒
</div>
<div id="dome4">
  <span class="day"></span>天|<span class="hour"></span>时|<span class="min"></span>分|<span class="sec"></span>秒
</div>
<div id="dome5">
  <span class="day"></span>天|<span class="hour"></span>时|<span class="min"></span>分|<span class="sec"></span>秒
</div>