在系统的权限控制模型中，当时按照最小依赖和最大重用把web系统权限控制划分成了业务逻辑、权限管理、权限验证、登陆代理、登陆服务、用户管理、业务逻辑数据库、业务权限数据库和用户数据库几个部分，现在开始逐一实现以上除业务逻辑的部分，今天发布的是单点登陆系统，也就是登陆代理和登陆服务。-The system' s access control model, then in accordance with the minimum and maximum reuse to rely on web access control system has become divided into business logic, rights management, rights verification, landing agents, land services, user management, business logic databases, business databases and user privileges several parts of the database, now on to achieve more than one part in addition to business logic, today announced that the single point of landing system, that is, landing agents and landing services.