JS整点抢购倒计时

// 整点抢购倒计时
    $(function () {
        show_time();
    });

    function show_time() {
        var time_start = new Date().getTime(); //设定当前时间
        var times = $("#closed_group").val();
        var time_end = new Date(times).getTime(); //设定目标时间
        var time_distance = time_end - time_start;// 计算时间差
        if (time_distance == 0) {
            alterTimes();
            show_time();
            return false;
        }
        //天

        var int_day = Math.floor(time_distance /86400000);
        time_distance -= int_day * 86400000;
        // 时

        var int_hour = Math.floor(time_distance / 3600000);
        time_distance -= int_hour * 3600000;
        // 分

        var int_minute = Math.floor(time_distance / 60000);
        time_distance -= int_minute * 60000;
        // 秒 

        var int_second = Math.floor(time_distance / 1000);

        //时分秒为单数时、前面加零 
        if(int_day==0){
             int_day = '';
        } else if (int_day < 10) {
            int_day = "0" + int_day+'天';
        }else{
             int_day =  int_day+'天';
        }
        if(int_hour==0){
             int_hour = '';
        } else if (int_hour < 10) {
            int_hour = "0" + int_hour+'时';
        }else{
             int_hour = int_hour+'时';
        }
         if(int_minute==0){
             int_minute = '';
        } else if (int_minute < 10) {
            int_minute = "0" + int_minute+'分';
        }else{
            int_minute =  int_minute+'分';
        }
         if(int_second==0){
             int_second = '';
        } else if (int_second < 10) {
            int_second = "0" + int_second+'秒';
        }else{
             int_second = int_second+'秒';
        }
        if(int_day==0 && int_hour==0 && int_hour==0 && int_second==0 ){
            int_time="活动结束";
        }
        
// 显示时间

        var int_time=int_day+int_hour+int_minute+int_second;
        $('#closed_group_time').html(int_time);
// 设置定时器
        setTimeout("show_time()", 1000);
    }


// 当计时器完成倒计时，执行
    function alterTimes() {
        var id= $("#closed_group']").attr('rel');
        $.post("{:U('Index/groupon_detail')}",{'id':id,'good_type':3}, function (data) {
            $("#closed_group']").val(data);
        });
    }