1.去除窗口标题栏，留下默认固定边框

this->setWindowFlags(Qt::Dialog | Qt::MSWindowsFixedSizeDialogHint | Qt::CustomizeWindowHint);

2.去除窗口标题栏，留下默认边框并允许拖拽改变窗口大小

this->setWindowFlags(Qt::Dialog | Qt::CustomizeWindowHint);

3.固定窗口大小，只留下关闭按钮

this->setWindowFlags(Qt::Dialog | Qt::MSWindowsFixedSizeDialogHint);

4.去除边框与标题栏

this->setWindowFlags(Qt::FramelessWindowHint);

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