如何在不大幅更改现有代码的情况下将用户名添加到socket.io服务器？

Question

我正在使用Socket.io IM服务器，并尝试添加用户名。我已经能够获取用户名并将其保存到名为“ user”的变量中，但是无法将用户名成功附加到该用户的外发消息中。我正在寻找一种无需大幅更改代码即可添加此功能的方法，因为我对socket.io缺乏经验。

我尝试了一些相当愚蠢的事情，例如仅将user变量添加到消息字符串中，但这只会使每个人看起来都像同一个用户-系统会将user的输入值附加到ALL消息中。现在，该网页提示您输入用户名，它只是不执行任何操作，因为我不知道如何分配特定的用户名。

这是我的客户端代码：

var audio = new Audio('https://cdn.glitch.com/a359ff0b-1273-40ab-a005-10968e106f1d%2Falert.wav?1558032194306');
user = prompt("enter username","");
$(function () {
    var socket = io();
    $('form').submit(function(){
      socket.emit('chat message' + user, $('#m').val())
      $('#m').val('');
      return false;
    });
//When the server emits " new user connected", add a message which says so.
  socket.on('new user', function(msg){
      $('#messages').append($('<li>').text('[SYSTEM]: New User Joined'));
      audio.play();
    });
//When the server emits "user disconnected", add a message which says so.
  socket.on('user disconnected', function(msg){
      $('#messages').append($('<li>').text('[SYSTEM]: User Left'));
      audio.play();
    });
    socket.on('chat message', function(msg){
      var form = $('#m').val();
      //logic for commands 
      var refresh = /#refresh/;
      var help = /#help/;
      var kill = /#kill/;
      var admin = /SUDO/;
      var one = refresh.test(msg);
      var two = help.test(msg);
      var three = kill.test(msg);
      var four = admin.test(msg);
      if (one == true) {
        location = location;
      } if (two == true) {
        $('#messages').append($('<li>').text('[SYSTEM]: The "#help" command has been activated. The following is an automated response and the user message which activated #help will appear below it in the chat stream. '));
        $('#messages').append($('<li>').text("[#HELP]: This message is a brief overview of how to use Megaphone: type a message into the bar above, and hit enter to send it. Refresh the window to clear messages, and to leave, simply close the tab.")); 
        function delay(ms, cb) { setTimeout(cb, ms) }
        document.title = "New Message!";
        audio.play();
        delay(5000, function() {
        document.title = "Megaphone";
        })

      } if (three == true && four == true) {
         location = "https://google.com"
      } if (three == true && four == false) {
        $('#messages').append($('<li>').text(' [SYSTEM]: ATTEMPTED ACCESS TO AN ADMIN COMMAND DETECTED. THE COMMAND CANNOT BE RUN WITHOUT AN ADMIN PASSPHRASE.'));
        function delay(ms, cb) { setTimeout(cb, ms) }
        document.title = "New Message!";
        audio.play();
        delay(5000, function() {
        document.title = "Megaphone";
        })
      } if (four == true) {
        var success = msg.split('SUDO')[1]
        $('#messages').append($('<li>').text(' [ADMIN]: ' + success));
        function delay(ms, cb) { setTimeout(cb, ms) }
        document.title = "New Message!";
        audio.play();
        delay(3000, function() {
        document.title = "Megaphone";
        })
      } else {
        $('#messages').append($('<li>').text(' [USER]: ' + msg));
        function delay(ms, cb) { setTimeout(cb, ms) }
        document.title = "New Message!";
        audio.play();
        delay(5000, function() {
        document.title = "Megaphone";
        })
      };
    });
  });

这是服务器端：

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);

app.get('/', function(req, res){
  res.sendFile(__dirname + '/index.html');
});

app.get('/about', function(req, res){
  res.sendFile(__dirname + '/about.html');
});

http.listen(3000, function(){
  console.log('listening on *:3000. Megaphone is functional.');
});
io.on('connection', function(socket) {
  console.log('a user connected succesfully.');
  io.emit('new user');
  socket.on('disconnect', function(){
  console.log('a user disconnected succesfully.');
  io.emit('user disconnected');
  });
});

io.on('connection', function(socket){
  socket.on('chat message', function(msg){
    console.log('message: ' + msg);
  });
});
io.on('connection', function(socket){
  socket.on('chat message', function(msg){
    io.emit('chat message', msg);
  });
});