io.emit無法發送給所有客戶端

Question

我試圖在一個簡單的socket.io游戲中實現“離開游戲”功能，但我不明白為什么io.emit僅通知離開游戲的客戶端套接字。 這是我的socket.js代碼：

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)    
    })

在客戶端上，我正在MobX存儲中處理套接字通信以及狀態管理。 這是我的GameStore.js代碼：

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)
            })
        })   
    })
  }
}

當我調度quitGame動作時，套接字只會向退出游戲的客戶端發出信號。 有人離開游戲后，我需要更新商店中的玩家列表，但是我無法弄清楚為什么其他客戶端沒有收到有人離開游戲的消息。 玩家加入游戲時， io.emit似乎工作正常。

Answer 1

看起來您直到該客戶端離開游戲之前都沒有注冊leftGame消息處理程序。 因此，仍然在游戲中的其他客戶端都沒有該消息的處理程序。 他們可能正在接收該消息，但是還沒有相應的處理程序，因此您看不到它。

移動此代碼：

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

因此，當客戶端希望開始接收這些消息時（可能在啟動時），它將注冊事件處理程序。