function onConnect(socket){
// 给本次连接的客户端发消息 socket.emit('hello', 'can you hear me?', 1, 2, 'abc'); // 给除了本次连接的其他所有连接者发消息 socket.broadcast.emit('broadcast', 'hello friends!'); // 给除了本次连接者之外的所有game房间的人发消息 socket.to('game').emit('nice game', "let's play a game"); //给除了本次连接者之外的所有game1、game2房间的人发消息 socket.to('game1').to('game2').emit('nice game', "let's play a game (too)"); // 给所有game中的人发消息 io.in('game').emit('big-announcement', 'the game will start soon'); // 给myNamespace命名空间的所有人发消息 io.of('myNamespace').emit('bigger-announcement', 'the tournament will start soon'); //给特定的socketid发消息（私信） socket.to(<socketid>).emit('hey', 'I just met you'); // 发送需要回执的消息 socket.emit('question', 'do you think so?', function (answer) {}); // 发送无需压缩的消息 socket.compress(false).emit('uncompressed', "that's rough"); // sending a message that might be dropped if the client is not ready to receive messages socket.volatile.emit('maybe', 'do you really need it?'); // sending to all clients on this node (when using multiple nodes) io.local.emit('hi', 'my lovely babies'); }; 详情 https://blog.csdn.net/natha
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// send to current request socket client
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socket.emit( 'message', "this is a test");
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// sending to all clients except sender
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socket.broadcast.emit( 'message', "this is a test");
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// sending to all clients in 'game' room(channel) except sender
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socket.broadcast.to( 'game').emit('message', 'nice game');
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// sending to all clients, include sender
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io.sockets.emit( 'message', "this is a test");
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// sending to all clients in 'game' room(channel), include sender
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io.sockets. in('game').emit('message', 'cool game');
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// sending to individual socketid
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io.sockets.socket(socketid).emit( 'message', 'for your eyes only');