控制器初始化中添加事件处理方法，在需要触发的地方直接触发

1     public function init() 2     { 3         parent::init(); // TODO: Change the autogenerated stub 4         Yii::$app->on('yii2event',function($event){ 5             $args=$event->sender; 6             echo $args['name']; 7             echo "
"; 8             Yii::$app->off('yii2event'); 9         });10     }11     public function actionYii2event(){12         Yii::$app->trigger('yii2event',new Event(['sender'=>['age'=>18,'sex'=>'mail','name'=>'Hello world']]));13     }