io.emit 无法发送给所有客户端

Question

我正在尝试在一个简单的 socket.io 游戏中实现 "leave game" 功能，但我不明白为什么 io.emit 只通知客户端离开游戏的套接字。这是我的 socket.js 代码：

io.on("connection", sock => {

    sock.on('joinGame', name => {
       inc++
       if(name === 'guest') name = name + inc.toString()
       addToGame(inc, name) // adds player to a new Map()
       io.emit('joinedGame', name)   
    })

    sock.on('findPlayersInGame', () => {
       getAllPlayersInGame(io, threeOrMore)
     // check to see if the client is notified when a new user joins
       io.emit('newPlayerJoined', 'new player joined')
    })

    sock.on('leaveGame', name => {
       io.emit('leftGame', uniquePlayers)    
    })

在客户端，我在 MobX 存储中处理套接字通信和状态管理。这是我的 GameStore.js 代码：

export class GameStore {
constructor(aGame) {
    extendObservable(this, {
        players: [],
        game: aGame,
        menuVisibility: true,
        play: action((id, username) => {
            this.menuVisibility = false
            username === undefined ? this.game.setName("guest") : this.game.setName(username)

            // join game with given username
            sock.emit('joinGame', this.game.playerName)

            // after joining, if the username is 'guest' change name to unique guest name provided by server
            sock.on('joinedGame', name => {
                if(this.game.playerName === 'guest') this.game.setName(name)
                console.log(this.game.playerName + " joined the game")
            })
            // populate player list with all players in game room
            this.loadPlayers()
        }),
        quitGame: action(() => {
            //this.menuVisibility = true
            sock.emit('leaveGame', this.game.playerName)
            sock.on('leftGame', players => { // this should be logged to all clients
                console.log('updated player list', players)
                this.players = players
            })
        }),
        loadPlayers: action(() => {
            sock.emit('findPlayersInGame', this.game.playerName)
            sock.on('loadPlayers', players => {
                console.log('loading players...')
                this.players = players
            })
            sock.on('newPlayerJoined', player => {
                console.log(player)
            })
        })   
    })
  }
}

当我发送 quitGame 动作时，套接字只发送给正在离开游戏的客户端。有人离开游戏后，我需要更新商店中的玩家列表，但我不明白为什么其他客户没有收到有人离开游戏的消息。 io.emit 在玩家加入游戏时似乎工作正常。

Answer 1

您似乎在该客户端离开游戏之前没有注册 leftGame 消息处理程序。因此，none 的仍在游戏中的其他客户端还具有该消息的处理程序。他们可能正在接收消息，但还没有消息处理程序，因此您看不到它。

移动此代码：

        sock.on('leftGame', players => { // this should be logged to all clients
            console.log('updated player list', players)
            this.players = players
        })

以便它在客户端想要开始接收这些消息时（可能在启动时）注册事件处理程序。

io.emit 无法发送给所有客户端

io.emit fails to emit to all clients

javascript

node.js

socket.io

reactjs

mobx-react