当 $address 不能存在时，则过滤数据会出现问题 address 字段为空的数据记录不返回   $guests = Guest::where('address','like','%'.$address.'%') ->where(function($query) use ($browser){ if (isset($browser)) { $query->where('browser', 'like', '%'.$browser.'%'); } }) ->where(function($query) use ($referrer){ if (isset($referrer)) { $query->where('referrer','like','%'.$referrer.'%'); } }) ->orderBy('created_at', 'desc') ->paginate($perPage = $pageSize, $columns = ['*'], $pageName = '', $page = $current);