电子时钟程序 按键key1是调节时间的选择按钮 按键key2是返回主程序按钮 按键key3是时间加1 按键 按键key4是时间减1按键-Electronic key key1 is to adjust the clock time for program selection button button button button key2 key3 is to return the main program is the time to add a button button button ke