键盘程序类似手机的九宫格输入模式,可以实现使每个键通过短时间内的按下次数不同识别不同的字符输入，节省键盘对系统控制面板的空间占用 -Squares procedure similar to cell phone keypad input mode, you can achieve so that each key is pressed through a number of different short identify different character input, the key