node.js - Socket.io - 无法发送到特定房间，但可以发送到每个人

Question

我正在使用Socket.io 2.0.4和React.js (CRA)

背景:在我的服务器代码(server.js)中，一旦有人成功加入房间，我想发出一个事件，告诉该房间中的所有客户端有人加入。

问题:如果我尝试将 .to(room) 或 .in(room) 与 .emit 结合使用，我不会收到错误，但不会向客户端传输任何内容...但 .emit 会自行工作。

有效方法:我成功地实现了 socket.join() 代码，并在回调中 console.log 使用我创建的 showClients 函数加入的每个人的 ID。我可以通过控制台看到每个人一次加入一个。

注意:我将房间名称存储在数据变量中并使用data.room访问它，但我也只是手动写入房间名称但无济于事。

客户端代码(删节)

import React, {Component} from 'react';
import Card from '../card/card';
import './game.css';

const io = require('socket.io-client');
const socket = io()  

class Game extends Component {

    constructor(props){
        super();
    }

componentDidMount(){
        this.gameCode();
        this.cardSelected();

        socket.on("cardDiscarded", this.updateDiscard);

        socket.on("playerJoined", () => {
            alert("hi!");
            console.log("YAY!!!!!!!!!!!!!!!!!!!!");
        });
    }
   //....rest of my code....
}

服务器代码(删节)

查看 joinRoom 函数以了解问题

const express = require('express');

const app = express();
const port = process.env.PORT || 5000;

const http = require("http").Server(app);
var io = require("socket.io")(http);

var bodyParser = require('body-parser');

console.log("Hello world!");

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}));

io.on("connection", (socket) => {

    socket.on("createNewRoom", (name) =>{
        CreateNewRoom();
        console.log("NEW ROOM CREATED!");
    })

    socket.on("joinRoomRequest", (name, room) =>{
        // console.log(name, room);
        console.log("Request to join room");
        var data = {
            name: name,
            room: room
        };
        joinRoom(data);
    })


    function CreateNewRoom() {
        //Get unique room number
        var thisGameId = (Math.random() * 1000000 ) | 0;

        //Send the room number to the browser
        socket.emit('newRoomCreated', {roomID: thisGameId, mySocketID: socket.id});
        //Tell socket.io this user is joining this room
        socket.join(thisGameId.toString());
        console.log(thisGameId);
    };

    function joinRoom(data){
        console.log("trying to join room:" + data.room);
        data.socketID = socket.id;
        console.log(data);
        socket.join(data.room, () => {
            let rooms = Object.keys(socket.rooms);
            //Let the clients know a player has joined
            console.log(rooms);
            console.log(data.name + " JOINED room " + data.room);
            showClients(data.room);
            io.to(data.room).emit("playerJoined");  //<----- DOESN't WORK
        });
    }

    function showClients(room){
        var roomClients = io.of('/').in(room).clients((err, data)=>{
            if (err) throw err;
            console.log("The people in room ", room, " are: ", data);
        })
    }
})

Answer 1

我成功地解决了这个问题:

不起作用:

socket.join (my_room)

工作:

socket.join (my_room.toString ())