$seller = Seller::with(["coupons"=>function($query) use ($data){
   $result = $query->with("banner")->field("id,seller_id,title,view,join,face_value,type")->paginate($data['limit'],false,[
       'list_rows'=>$data['limit'],
       'page'=>$data['page']
   ]);
   $list['list'] = $result->items();
   $list['total'] = $result->total();
   $list['lastPage'] = $result->lastPage();
   return $list;
}])->where('id','=',$seller_id)->find();
return $seller;

数据可以正常查询出来、但是没有相关的分页信息