通过这一款选修课小系统，学生可以登入学生端进行选课及其他的操作，管理者通过登入管理端可以进行对选修课系统的数据的管理和维护。-A small systems through this elective, students can log on to elective and other students to end the operation, the manager through the client can log management data on the elective syst