方式一：

这种方式不适合id不连续的方法：

$data_start = date('Y-m-d 00:00:00',time());
        // $data_now = date('y-m-d H:i:s',time());
        // $list = Db::connect('xxx')->name('top_douyin')->where('update_time','>=',$data_start)->order('rand()')->limit(10)->select()->toArray();
        $num = 8;    //需要抽取的默认条数
        $table = 'top_xxx';    //需要抽取的数据表
        $countcus = Db::connect('xxx')->name($table)->where('update_time',$data_start)->max('id');    //统计某个字段最大数据
        $min = Db::connect('xxx')->name($table)->where('update_time',$data_start)->min('id');    //统计某个字段最小数据
        // dump(777711,$countcus,$min);exit;
        $i = 1;
        $flag = 0;
        $ary = array();
        while($i<=$num){
            $rundnum = rand($min, $countcus);//抽取随机数
            // dump(777713,$rundnum,$min,$countcus);exit;
            if($flag != $rundnum){
                //过滤重复
                echo $rundnum.'<br>';
                if(!in_array($rundnum,$ary)){
                    $ary[] = $rundnum;
                    $flag = $rundnum;
                }else{
                    // $i--;
                }
                $i++;
            }
        }
        dump(777714,$ary);
        // $list = Db::connect('xxx')->name($table)->where('id','in',$ary,'or')->column('title','id');
        // $list = Db::connect('xxx')->name($table)->where('id','in',$ary)->column('title','id');
        $list = Db::connect('xxx')->name($table)->where('id','in',$ary)->field('title,id')->select()->toArray();
        dump(777715,$list);exit;
        // return json_encode(['200'=>$list],JSON_UNESCAPED_UNICODE);
        return json_encode($list,JSON_UNESCAPED_UNICODE);

方式二：

SELECT * FROM ny_top_douyin ORDER BY rand() LIMIT 6;
// 随机获取6条数据
$data = Db::name('xxx')
          ->orderRaw('rand()')
          ->limit(6)
          ->select();