p2p不同于C/S 模式（如图 ）, 不需要中央服务器的支持, 计算节点在功能上是对等的, 既可以充当客户机享用其他节点提供的服务, 又可以充当服务器为其他节点提供服务, 允许计算节点之间直接交流和协作-p2p is different from the C/S mode (Figure), do not need the support of a central server, computing nodes in the function are on equal footing, not only can act as clients to enjoy the services provided by other nodes, but also act as a server for other nodes to provide services , allowing direct exchange between computing nodes and collaboration