说明：  系统面向的用户分为注册用户，普通用户，图书管理员。 注册用户未经管理员审核，不能进行借书操作，只能对馆内信息进行浏览。 普通用户分为老师，博士生，研究生，本科生，均可以进行图书的借阅，续借，查询，个人信息更改等操作，四种角色对于图书的借阅和预约有不同的权限。 图书管理员就是系统的管理员，除了进行普通用户的相关操作，还可以进入后台直接对于用户、图书、出版社、作者等信息进行查看和修改，并且可以看到图书的借书和预约的报表。
(User-oriented system into registered users, ordinary users, librarians. Registered users without administrator audit can not be borrowing operations, information can only be viewed on the museum. Ordinary users are divided into teachers, doctoral students, graduate students, undergraduates, both books can borrow, renew, query, change of personal information and other operations, the four roles to borrow and appointment books have different privileges. The librarian is the system administrator, in addition to ordinary users related operations, but also directly into the background for the user, books, publishers, authors and other information can be viewed and modified, and you can see the library books and booking reports .)