为了老师更好的管理学生，选课系统应运而生，而基于B/S架构的选课系统更加方便，而不必每个客户都下一个客户端而通过浏览器而直接执行-In order to teachers to better manage students, elective system came into being, but based on B/S structure of the elective system more convenient, without having to each customer under