12.QT项目中启用c++11语法支持
greater Than(QT_MAJOR_VERSION, 4): CONFIG += c++11 less Than(QT_MAJOR_VERSION, 5): QMAKE_CXXFLAGS += -std=c++11
6
greater Than(QT_MAJOR_VERSION, 4): CONFIG += c++11 less Than(QT_MAJOR_VERSION, 5): QMAKE_CXXFLAGS += -std=c++11
