说明：  1、立相应的用户和权限管理。 2、实现学生档案数据的建立、维护 3、建立一个学生成绩管理系统 4、实现学生成绩的计算、统计和分析
(1, li corresponding user and rights management. 2, the students realize the establishment of archival data, the maintenance of 3, the establishment of a student achievement management system 4, the students realize the calculation results, statistics and analysis)