gui的几个例子，图片的显示 -选择，显示，退出时有弹出对话框 还有一个是学习成绩选择的例子根据ilovematlab-学习视频编写 -a few examples of gui, images are displayed- Select, display, has pop-up dialog box when the exit there is a choice example is the academic ilovematlab-study prepared in accordance w