Qt教程第三课 学会帮助文档，开发倒计时软件【c++语言实战】#编程创造城市#刘金玉
Synopsis
笔记： QT帮助文档快捷键F1 退出帮助窗口esc 只要是Widgets都是属于控件，最顶层的Widgets就是窗体slot槽---方法（函数） ...
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