这是一个记事本，仿照Windows中的实现，新建菜单，编辑菜单，关于菜单都已经实现，支持撤销，查找，音乐播放，换行等功能-This is a Notepad, modeled in the realization of Windows, the new menu, the Edit menu on the menu have been achieved, supported the abolition of, look, music player, line breaks and other f