如何在两个客户端上从服务器接收数据

Question

我有一个客户端测试功能，它将测试对象发送到socket.io服务器，该服务器的工作是等待客户端事件，然后将数据发送到原始客户端发出事件的房间中的每个客户端。但是，只有原始客户端从服务器接收事件。房间中的其他客户端没有接收到它。

我已经尝试了io.in（room）. emit（）以及io.to（room）. emit（）服务器端。两个客户端肯定加入同一个房间。服务器也从原始客户端接收事件。

Server.js：

const express = require("express");
const app = express();
const server = require("http").createServer(app);
const io = require("socket.io").listen(server);
const port = process.env.PORT || 3000;
io.on("connection", socket => {
    console.log("user connected: " + socket.id);
    socket.on("test", test => {
        console.log("received from client, emitting to room: " +     test.room);
        // io.to(test.room).emit("test", {key: "property from server"}
        // io.in(test.room).emit("test", {key: property from server"}
    })
})
server.listen(port, () => {
    console.log("server running on port: " + port);
});

父组件：

const socket = io("http://172.31.99.250:3000");
export default class Lobby extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      username: "",
      queue: [],
      playerOne: null,
      playerTwo: null,
      currentMove: "",
      matchFound: false,
      room: null
    };
  }
componentDidMount() {
  this.joinLobby();
}
joinLobby() {
  socket.emit("findMatch() )
  socket.on("matchFound", data => {
  this.setState({
    currentMove: data.currentMove,
    playerOne: data.p1,
    playerTwo: data.p2,
    matchFound: true,
    room: data.gameId
  });
});   
render() {
    return this.state.matchFound == true ? (
         <ChildComponent
             room={this.state.room}
             socket={socket}
         />
     );
}
}

子组件：

export default class GameBoard extends Component {
  constructor(props) {
    super(props);
    this.state = {
      inProgress: true,
      msg: null
    }
componentDidMount() {
    alert("Room ID: " + this.props.room);
}
onTest = () => {
this.props.socket.emit("test", {
  testKey: "testProperty",
  room: this.props.room
});
this.props.socket.on("test", response => {
  alert("response received: " + response.key);
  });
};
render() {
   <View>
     <TouchableOpacity
       onPress={this.onTest}
     />
   </View>
 }
 }

我希望在两个连接的客户端上读取服务器消息，原始事件是从房间里的每个客户端发送的，但是只有原始客户端接收服务器消息，而不是同一房间的第二个客户端

Answer 1

我认为在服务器上。你需要做的js

socket.join(test.room);