所以我有一个工作的express服务器，我想添加websockets功能，这是应该工作的代码

import express from "express";
import { WebSocketServer } from 'ws';
const app = express();
const port = 80;

const wss = new WebSocketServer({ server:app });
wss.on('connection', function connection(ws) {
  ws.on('message', function message(data) {
    console.log('received: %s', data);
  });
});
app.listen(port, function () {
  console.log("Server listening on port: " + port);
});

字符串
上面的没有工作，什么工作是这样的：

import { createServer } from 'http';
import express from "express";
import { WebSocketServer } from 'ws';
const app = express();
const port = 80;
const server = createServer(app)

const wss = new WebSocketServer({ server:server });
wss.on('connection', function connection(ws) {
  ws.on('message', function message(data) {
    console.log('received: %s', data);
  });
});
server.listen(port, function () {
  console.log("Server listening on port: " + port);
});

型
那么我的结论是正确的，我需要从'http'导入{ createServer }才能使代码工作吗？