此程序为基本的按键程序，代码简单明了，通俗易懂，是最基本的按键历程，希望大家参阅，并提出意见，希望嫩给大家帮助-This program is the basic key procedures, the code is simple, easy to understand, is the most basic keys course, I hope you see, and comment on, I hope to give you help and tender! ! ! !