[WebSocket] 看見其他玩家加入/離開

[ricksu978]

eventBus.boardcast(msg)

{
  "type": "USER_JOINED",
  "data": {
    "user": {
        "id": String,
        "nickname": String
    },
    "roomId": String,
  }
}

{
  "type": "USER_LEFT",
  "data": {
    "user": {
        "id": String,
        "nickname": String
    },
    "roomId": String,
  }
}