QT工具栏开始，退出

QT工具栏开始，退出

 //初始化场景
    QMenuBar *bar = menuBar();
    setMenuBar(bar);
    QMenu *startbar = bar->addMenu("开始");
    QAction * quitAction = startbar->addAction("退出");
    connect(quitAction , &QAction::triggered,[=](){
        this->close();
    });