QMessageBox mess(QMessageBox::Question, "删除提示", "确认删除所选组件?", NULL);

 QPushButton *okButton = mess.addButton(tr("确定"), QMessageBox::AcceptRole);

 QPushButton *cancelButton = mess.addButton(tr("取消"),QMessageBox::RejectRole);

 mess.exec();

     QMessageBox box(QMessageBox::Warning,"标题","弹出框按钮更改为中文！");

     box.setStandardButtons (QMessageBox::Ok|QMessageBox::Cancel);

     box.setButtonText (QMessageBox::Ok,QString("确 定"));

     box.setButtonText (QMessageBox::Cancel,QString("取 消"));

     box.exec ();

   QApplication app(argc, argv);

   QTranslator translator;

   translator.load("qt_zh_CN.qm");

   app.installTranslator(&translator);