说明：  新型的按键扫描程序.rar 我非常坚信这种按键处理办法的便捷和高效，你可以移植到任何一种嵌入式处理器上面，因为C语言强大的可移植性。 同时，这里面用到了一些分层的思想，在单片机当中也是相当有用的，也是本文的另外一个重点。
(I'm very confident that this button handling is easy and efficient, and you can transplant it to any embedded processor because of the powerful portability of the C language. At the same time, it uses some layered thinking, which is also very useful in the microcontroller, but also another focus of this article.)