模拟手机屏幕，实现所有编辑功能。 模块化分不是很合理，主要是想和初级程序员分享一下编码规范，当然该程序还有很多不足之处，想借此机会请大家多多指正，谢谢！-Analog cell phone screen, all editing features. Modular sub-not very reasonable, and only want to share code norms to junior programmer, of course, the program is not perf