1.新建action toolbar
openFileAction = new QAction(QIcon(":/pic/open"), QString::fromLocal8Bit("打开"), this);
openFileAction->setShortcut(tr("Ctrl+O"));
openFileAction->setStatusTip(tr("打开一个文件"));
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//获得toolbar
fileTool = addToolBar("File");
1.添加新的menu
auto fileMenu = menuBar()->addMenu(QString::fromLocal8Bit("文件"));
2.向其中添加action
fileMenu->addAction(openFileAction);
fileTool->addAction(openFileAction);