public function actionIndex()
 {
     Event::on(TestEvent::className(), TestEvent::TEST, function () {
         echo "this is my first event test !" . PHP_EOL;
     });
     $this->testEvent->test();
     $eve = new TestEvent();
     $eve->test();
     //最新文章
     $lastestArticles = $this->article->getArticlesByType(0);
     //最热文章
     $hotArticles = $this->article->getArticlesByType(1);
     $params = array("lastestArticles" => $lastestArticles, "hotArticles" => $hotArticles);
     //查询所有的分类信息
     return $this->render("index", $params);
 }
 public function test()
 {
     Event::trigger(TestEvent::className(), self::TEST);
 }