> ` input('post.sort/a') 对应前台传过来的值name="sort[{$item.id}]";` > `注明此处的sort不是数据库里的字段;` ``` public function sort(){ if($this->request->isPost()) { foreach (input('post.sort/a') as $k => $v) { \db('category')->where('id', $k)->update(['sort_id' => $v]); } return $this->success(); } } ```