tp6监听、订阅使用方式

        Tp6内提供了事件监听，订阅，操作记录如下：

        NO1：事件监听部分：

            a：手动注册事件监听，在控制器index的构造方法内添加如下：

                    public function __construct(){

                        Event::listen('lis_demo', function($param){

                            echo $param;

                        });

                    }

            b：控制器内使用监听

                    public function index(){

                        event('lis_demo', '监听参数');

                    }

            c：浏览器访问index方法，输出监听参数；

            a1：使用监听类实现监听，运行命令 php think make:listener TestListen;将会在根目录生成listen\TestListen.php监听类，文件包含一个handle方法，编写如下：       

                public function handle($event)

                {

                    echo 'TestListen监听成功';

                }

            b1：在项目根目录的event.php内注册监听：

                'listen'    => [

                    'AppInit'  => [],

                    'HttpRun'  => [],

                    'HttpEnd'  => [],

                    'LogLevel' => [],

                    'LogWrite' => [],

                    'TestListen'    =>    ['app\listener\TestListen'],

                ],

            c1：在控制器index内监听

                public function index(){

                    event('TestListen'); //输出TestListen监听成功

                }

        NO2：事件订阅部分：

            a：运行命令 php think make:subscribe TestSub; 将会在根目录下生成 subscribe\TestSub;

            b：订阅类自定义多个方法如下：

                public function onTestSub1(){

                    echo("testSub1");

                }

                public function onTestSub2(){

                    echo("testSub2");

                }

            c：在事件文件event.php注册订阅事件：

                'subscribe' => [

                    'app\subscribe\TestSub',

                ],

            d：在index控制器类订阅：

                public function index(){

                    event('TestSub1');    //testSub1

             event('TestSub2');    //testSub2

                }