目 录1.前言.................................................................................................................................................................42.需求分析.........................................................................................................................................................52.1 系统的功能需求..........................................................................................................................................52.1.4 点歌....................................................................................................................................................52.1.5 分组管理............................................................................................................................................52.1.6 个人信息管理....................................................................................................................................52.1.7 用户管理............................................................................................................................................52.1.8 视频通话............................................................................................................................................52.2 非功能需求：..............................................................................................................................................52.2.2 网络安全............................................................................................................................................52.3 用例分析......................................................................................................................................................62.3.1 参加者................................................................................................................................................62.3.2 用例分析.......................................................................
