键盘程序大全，有单独键，组合键，最少的IO实现最多按键的原理，双击，一键多功能等等，内有完整代码及注释，很适合学习用-Keyboard program Daquan, the principle of separate keys, key combinations, the least IO up keys, double-click, a key multifunctional, with complete code and comments, very suitable for learni