在.pro里：
build_type = CONFIG(debug, debug|release) { build_type = debug } else { build_type = release } DESTDIR = $$build_type/out OBJECTS_DIR = $$build_type/obj MOC_DIR = $$build_type/moc RCC_DIR = $$build_type/rcc UI_DIR = $$build_type/ui
结果：
参考：http://www.qtbig.com/page/4/