Socket.io：用户断开连接后客户端（套接字）会发生什么？我可以/应该将其删除吗？

I am using socket.io, and I want to know how can I remove the client(socket) after a connection is closed. (In fact, I don't know what is going on after a connection is close, will that socket remained there? Should I remove it? Will it take up memory?)I am using socket.io, and I want to know how ca