说明：  我的服装DRP之即时通讯请时刻注意本文所说的IM并非单纯的聊天软件，而是为企业应用系统服务的辅助类工具。它应该具有相对独立性、良好的扩展性和简便的应用性（应用是对用户和开发人员两者来说的，用户能方便的使用它，开发人员能方便地将它接入系统）
(My clothing DRP please keep in mind the instant messaging IM mentioned herein is not a simple chat software, but for enterprise applications services auxiliary class tool. It should have a relative independence, good scalability and ease of applicability (application is for both users and developers, and users can easily use it, developers can easily access system it))