这是一个补充文档，以供参考。
socket.emit('message', "this is a test"); //sending to sender-client onlysocket.broadcast.emit('message', "this is a test"); //sending to all clients except sendersocket.broadcast.to('game').emit('message', 'nice game'); //sending to all clients in 'game' room(channel) except sendersocket.to('game').emit('message', 'enjoy the game'); //sending to sender client, only if they are in 'game' room(channel)socket.broadcast.to(socketid).emit('message', 'for your eyes only'); //sending to individual socketidio.emit('message', "this is a test"); //sending to all clients, include senderio.in('game').emit('message', 'cool game'); //sending to all clients in 'game' room(channel), include senderio.of('myNamespace').emit('message', 'gg'); //sending to all clients in namespace 'myNamespace', include sendersocket.emit(); //send to all connected clientssocket.broadcast.emit(); //send to all connected clients except the one that sent the messagesocket.on(); //event listener, can be called on client to execute on serverio.sockets.socket(); //for emiting to specific clientsio.sockets.emit(); //send to all connected clients (same as socket.emit)io.sockets.on() ; //initial connection from a client.希望这可以帮助！。
