QMenu用于设置菜单图标并生成菜单树

    protected slots:
    void onMenuTriggered(QAction*);
    

    // 菜单
    QMenu *pMenu = new QMenu(this);
    pMenu->addAction(QString::fromLocal8Bit("我"));
    pMenu->addSeparator();
    pMenu->addAction(QString::fromLocal8Bit("爱"));
    
    QMenu *pChildMenu = new QMenu(this);
    pChildMenu->setTitle(QStringLiteral("学"));
    pChildMenu->addAction(QStringLiteral("Q"));
    pMenu->addMenu(pChildMenu);
    
    QAction *act1 = new QAction(p