键盘在所有的驱动之中最为简单的一种，但它却包含了驱动的基本框架，对以后继续深入学习其他复杂的驱动大有裨益，以下便为你逐步剖析驱动的开发。采用的是查询方式。-Keyboard in all drive the most simple one, but it contains the drive the basic framework and to further study other complex driving benefit, the following will be you step by step analysis of the driven development. Query method is used