Users can choose different access permissions. When access to the system adminis...

代码说明：

用户可选择不同权限进入系统。当以管理员权限进入系统时，可进行相应的成绩添加，查询，删除，修改，用户添加删除等功能，当以学生权限进入系统时，则只能进行成绩查询和密码修改等功能-Users can choose different access permissions. When access to the system administrator can add to the corresponding results, query, delete, modify, delete users and other functions, when the rights of students to enter the system, the results can only query and modify features such as password