这是一个服务器与客户端应答的关系 通过服务器的应答实现自己想要的功能再返回给客户端 如客户端输入1个数字 可以通过服务器求出阶乘累加和再给客户端-This is a server and client response relationship between the response through the server to achieve the functionality they want to return to the client if the client can input a number of factorial additive obtained through the server and give the client