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环境: Qt5.3.1, mac os x 10.10.1
setWindowFlags(Qt::Window | Qt::WindowTitleHint | Qt::CustomizeWindowHint | Qt::WindowCloseButtonHint);
Qt窗口-仅显示关闭按钮
原文地址:http://www.cnblogs.com/bugchecker/p/qt_window_only_show_closebtn.html