学生选课系统客户端，可构建姓名、生日，所选课程、学分和成绩等信息，可在外部文档读入所选课程信息，并在选完课后将信息存储到文档里。-Student elective system, you can build name, birthday, selected courses, credits and performance information, read into the selected course information in an external document, and afte