2.2.2 房间
加入或离开
io.on('connection',socket=>{
socket.join("some room")
})io.to('some room').emit('some event');io.leave("some room")默认房间
io.on('connection',(socket)=>{
socket.io('say to someone',(id,msg)=>{
socket.broadcast.to(id).emit("my message",msg)
})
})断开
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