socket.io服务器不在网络外部工作

Question

Heello !!!

[借助此工具，我成功地将端口转发为端口3000。https://www.yougetsignal.com/tools/open-ports/

之所以转发此端口，是因为我有一个聊天应用程序，可以在localhost上很好地工作。可悲的是，当要求我的朋友打开我的网络聊天应用程序（http://mywebsite.com:81/chat/）时，javascript内容无法通过端口3000连接到我的服务器...

'这是我的一些代码：

server.js

const io = require('socket.io')(3000)

const users = {}

io.on('connection', socket => {
    // On message receive
    socket.on('msg', message => {
        //broadcast message
        socket.broadcast.emit('msg', {name: users[socket.id], msg: message});

        // If message starts with "/" AKA is a command
        if(message.startsWith("/")){
            message=message.split(" ");
            //message[0]= /help

            if(message[0] == "/say"){
                txt=message.splice(1).join(" "); // GET TEXT AFTER /help
                socket.emit('msg', {name: "TomatoBot", msg: txt});
            }else if(message[0] == "/help"){
                txt=message.splice(1).join(" "); // GET TEXT AFTER /help
                socket.emit('msg', {name: "TomatoBot", msg: "help dialog"});
            }else if(message[0] == "/list"){
                socket.emit('msg', {name: "TomatoBot", msg: users[socket.id]+" connected users:
"});
            }else{
                //no commands found, throw error
                socket.emit('msg', {name: "TomatoBot", msg: "@"+users[socket.id]+"
Unknown command: "+message[0]+". Type /help for a list of commands."});
            }
        }
    })

    // On user join
    socket.on('new', name => {
        users[socket.id] = name;
        socket.broadcast.emit('new', name);
    })

    // On user disconnect
    socket.on('disconnect', () => {
        socket.broadcast.emit('bye', users[socket.id]);
        delete users[socket.id];
    })
})

script.js（我的客户端脚本）

const socket = io(':3000'); // go from localhost:81 to localhost:3000!!
const form = document.getElementById('form');
const input = document.getElementById('input');
const msgbox = document.getElementById('msgbox');

const name = prompt('name?');
socket.emit('new', name);
appendMessage(name+' joined');
// etc etc.....

因此，正如我已经说过的那样，连接和消息在localhost上已通过，但是一旦我使用外部域/ IP，就不再起作用了！！从外部直接访问mywebsite.org:3000/socket.io/socket.io.js时，连接有效！

我在这里很迷路，这一定是由于我的代码中出现了一些愚蠢的错误。

感谢大家的帮助！