jquery实现倒计时代码分享

<span class="time_wrap" value="1397145180" style="line-height:200%;"></span>

<script type="text/javascript">   
    $(document).ready(function(){   
        setInterval(function(){        
        $(".time_wrap").each(function(){   
            var Obj = this;       
            var EndTime = new Date(parseInt($(Obj).attr('value')) * 1000);   
            var NowTime = new Date();   
            var nMS=EndTime.getTime() - NowTime.getTime();   
            var nD=Math.floor(nMS/(1000 * 60 * 60 * 24));   
            var nH=Math.floor(nMS/(1000*60*60)) % 24;   
            var nM=Math.floor(nMS/(1000*60)) % 60;   
            var nS=Math.floor(nMS/1000) % 60;   
            var nMS=Math.floor(nMS/100) % 10;   
            if(nD>= 0){        
                var str = '<span class="timer" ><em>'+nD+'</em>天<em>'+nH+'</em>小时<em>'+nM+'</em>分<em>'+nS+'.'+nMS+'</em>秒</span>';   
                $(Obj).html(str);   
            }        
            });   
        }, 100);
    });
</script>