1.hook鉤子與行為 通過配置文件執行鉤子行為  ``` public function index(){ Hook::listen('test'); echo cache('name3'); } ``` ``` <?php namespace app\index\controller; use think\Controller; class A{ public function run(){ $this->a1(); $this->b1(); $this->c1(); } public function a1(){ cache('name1',1); } public function b1(){ cache('name2',2); } public function c1(){ cache('name3',3); } } ```