该代码展示了类的使用方式，适合教学使用。通过运用辞典等结构完成了一个班级信息管理的要求。-The code demonstrates the use of the way the class for teaching. Through the use of dictionaries and other structures completed a class information management requirements.

拓扑图展示jointjs，javascr ipt实现拓扑图(Topological diagram shows jointjs, Javascr ipt realize topological diagram)