在程序中动态创建菜单,菜单项中可以显示图标,比较美观-procedures in the creation of dynamic menu, the menu items will show icon, more beautiful

显示文件、编辑、帮助菜单项，并设置了热键，能实现打开、另存为、退出、改变字体、颜色等功能，并修改了应用程序图标。-Display File, Edit, Help menu item, and set the hotkey to achieve open, save as, exit, change fonts, colors and other functions, and modify the application icon.