QMenu* menuS = new QMenu;
connect(menuS,SIGNAL(triggered(QAction*)),this,SLOT(onRunselect(QAction*)));
QAction* actionS = new QAction(menuS);
menuS->addAction(actionS);
actionS->setText("执行B");
menuS->setStyleSheet("background-color: rgb(92, 241, 162);color: rgb(255, 255, 255); font:9pt");
ui->bn_Run_2->setMenu(menuS);
ui->bn_Run->setStyleSheet("background-color:transparent;color: rgb(255, 255, 255); font: 9pt");