用 express-ws 和 socket.io 分别构建 websocket 服务器端有区别吗

express-ws 构建的服务，可以用第三方 client 链接发送数据

const express     = require('express');
const app         = express();
const expressWs   = require('express-ws')(app);
const morgan      = require('morgan');
const compression = require('compression');
const serveStatic = require('serve-static');
const basicAuth   = require('basic-auth-connect');

const user = process.env.USER;
const pass = process.env.PASS;

let connects = [];

app.set('port', process.env.PORT || 8080);

if (user && pass) {
  app.use(basicAuth(user, pass));
}

app.use(morgan('dev'));
app.use(compression());
app.use(serveStatic(`${__dirname}/public`));

app.ws('/', (ws, req) => {
  connects.push(ws);

  ws.on('message', message => {
    console.log('Received -', message);
    
    connects.forEach(socket => {
      socket.send(message);
    });
  });
  
  ws.on('close', () => {
    connects = connects.filter(conn => {
      return (conn === ws) ? false : true;
    });
  });
});

app.listen(app.get('port'), () => {
  console.log('Server listening on port %s', app.get('port'));
});

socket.io 构建的服务第三方 client 连接不上，但是 demo 可以发送数据

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')( http);
var port = process.env.PORT || 3000;

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

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

http.listen(port, function(){
  console.log('listening on *:' + port);
});

刚刚接触，没理解问题出现在哪里