thinkphp5框架前后端分离项目实现分页功能的方法分析

/**
* Notes:消费记录
* Date: 2019/6/25
* Time: 15:43
* @param Request $request
* @return \think\response\Json
*/
public function getMyConsumeLog(Request $request)
{
    global $_W;
    $size = $request->param('size', 6);
    $list = $this->model->getListByMid($_W['user']['id'],$size);
    return json(['data' => $list, 'error' => 0, 'message' => 'success']);
}
public function getListByMid($mid,$size = 10){
    $res = $this
      ->alias('c')
      ->field('c.*,b.book_name,b.book_flash,s.section_title')
      ->leftJoin('booksection s','c.chapter_id = s.id')
      ->leftJoin('book b','s.book_id = b.id')
      ->where('c.mid',$mid)
      ->order('c.id desc')
      ->paginate($size);
    return $res;
}

$curr_page = $request->param('page', 1);
    $size = $request->param('size', 6);
$list = $consume_model->getListByWhere($curr_page, $size, $where);
    $num = $consume_model->getListByWhereCount($where);
    return json(['data' => $list,'num' => $num,'error' => 0, 'message' => 'success']);
public function getListByWhere($curr_page,$limit = 10,$where = null){
    $res = $this
      ->alias('c')
      ->field('c.*,b.book_name,s.section_title')
      ->leftJoin('booksection s','c.chapter_id = s.id')
      ->leftJoin('book b','s.book_id = b.id')
      ->where($where)
      ->order('c.id desc')
      ->limit($limit*($curr_page - 1),$limit)
      ->select()
      ->toArray();
    return $res;
}
public function getListByWhereCount($where = null){
    $count = $this
      ->alias('c')
      ->where($where)
      ->count();
    return $count;
}