4.3.2 socket_rooms
(Object)
标识此socket所在房间的字符串哈希,按房间名称索引。
io.on('connection',(socket)=>{
socket.join('room 237',()=>{
let rooms= Object.keys(socket.rooms)
console.log(rooms); // [ <socket.id>,"room 237" ]
})
})
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