JS倒计时

HTML:

        <div class="countDown">
            <i class='hour1'></i><i class="hour2"></i>:
            <i class='minute1'></i><i class='minute2'></i>:
            <i class='second1'></i><i class='second2'></i>
        </div>

JS:

function timePoor(){
    $('.countDown').each(function(){
        var str = '';
        var time = [];
        var bad = $(this).attr('second')?parseInt($(this).attr('second')):0;//时间差秒数
        var badHours = Math.floor(bad/(3600)); //差值小时
        if(badHours>24){
            badHours = Math.floor(badHours/24);
            $(this).html('还剩余'+badHours+'天');
        }else{
            time.push(badHours);
            
            //计算相差分钟数
            var mMs = bad%(3600);            //计算小时数后剩余的毫秒数
            var badMinutes = Math.floor(mMs/(60));//差值分钟
            time.push(badMinutes);

            //计算相差秒数
            var ms = mMs%(60);             //计算分钟数后剩余的毫秒数
            var badSeconds = Math.round(ms);//差值秒
            time.push(badSeconds);    
            
            //转成字符串
            for(var i = 0;i<time.length;i++){
                var str1 = time[i].toString();
                if(str1.length < 2){
                    str += 0+str1;
                }else{
                    str += str1;
                }
            }    
            
            $(this).find('.hour1').text(str[0]);
            $(this).find('.hour2').text(str[1]);
            $(this).find('.minute1').text(str[2]);
            $(this).find('.minute2').text(str[3]);
            $(this).find('.second1').text(str[4]);
            $(this).find('.second2').text(str[5]);
        }
    })
    snatchDownTime();//倒计时
    function snatchDownTime(){
        $('.countDown').each(function(){
            var $this = $(this);
            if($this.children('i').length==0){
                return true;//结束本次循环进入下一次循环
            }
            var i = $this.children('i');
            var timeArry = [];
            i.each(function(){
                timeArry.push($(this).text());
            });
            var hour = parseInt((timeArry[0]+timeArry[1]));//时
            var minute = parseInt(timeArry[2]+timeArry[3]);//分
            var second = parseInt(timeArry[4]+timeArry[5]);//秒
            var timer = setInterval(function(){
                second--;//秒
                if(second<0){
                    second = 59;
                    minute--;//分
                    if(minute<0){
                        minute = 59;
                        hour--;//时
                        if(hour<0){//如果小时数为负数，则关闭计时器
                            clearInterval(timer);
                        }else{//检测剩余时间是否为负，不为负数才继续进行显示
                            time($this,hour,'.hour1','.hour2');
                            time($this,minute,'.minute1','.minute2');
                        }    
                    }else{
                        time($this,minute,'.minute1','.minute2');
                        time($this,second,'.second1','.second2');
                    }
                }else{
                    time($this,second,'.second1','.second2');
                }
            },1000);        
            function time($this,num,ele1,ele2){//显示时间方法
                var seconds;
                if(num>9){
                    seconds = num + '';
                }else{
                    seconds = 0+''+ num;
                }
                $this.find(ele1).text(seconds[0]);
                $this.find(ele2).text(seconds[1]);
            }
        });
    }
}