建立一个MainWindows，取消创建Qt

1、添加菜单栏

#include 
    

​    menuBar()->addMenu( "&File" );    menuBar()->addMenu( "&Edit" );    menuBar()->addMenu( "&View" );    menuBar()->addMenu( "&Simulate" );    menuBar()->addMenu( "&Help" );​

2、添加底部状态栏

#include 
    

statusBar()->showMessage("QSimulate has started");

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