倒计时方法

servertiem 现在时间 datatime 目标时间

        function timeCount(servertime,datatime,obj){            
            if(datatime<servertime){
                $(".countdown").hide();
                clearInterval(timer);
                return false;
            } 
            var localtime = new Date();
            var timedifference = localtime-servertime;
            var timecount = interval(timedifference,datatime);
            var timer = setInterval(function(){
                timecount = interval(timedifference,datatime);
                if (!timecount){
                    clearInterval(timer);
                    $(".countdown").hide();
                    return false;
                }
                else{
                    //代码剪切填充，例如
                    obj.find("span").eq(0).html(timecount.charAt(0));
                    obj.find("span").eq(1).html(timecount.charAt(1));
                    obj.find("span").eq(2).html(timecount.charAt(2));
                    obj.find("span").eq(3).html(timecount.charAt(3));
                    obj.find("span").eq(4).html(timecount.charAt(4));
                    obj.find("span").eq(5).html(timecount.charAt(5));
                }
            },1000) 
        }

获取时间差函数并转换为：天时分秒

     function interval(timedifference,datatime){
        var timecount = parseInt(datatime) + timedifference - new Date();
        if(timecount<=0)return false;
        var int_day, int_hour, int_minute, int_second;
        int_day = Math.floor(timecount/86400000);
        int_hour = Math.floor(timecount%86400000/3600000);
        int_minute = Math.floor(timecount%3600000/60000);
        int_second = Math.floor(timecount%60000/1000);
            int_hour = int_day*24+int_hour;
            if(int_hour < 10)
            int_hour = "0" + int_hour;
            if(int_minute < 10)
            int_minute = "0" + int_minute;
            if(int_second < 10)
            int_second = "0" + int_second;
            var result = ""+int_hour+int_minute+int_second;
         //一定要加空字符串，否则是数字相加而不是拼接了
            return result;
     }