Node.js 与 Twisted 的用例有哪些

Node.js 和 Twisted 是两个非常流行的服务器端框架，它们都能够以非阻塞的方式处理大量的并发请求。本文将介绍 Node.js 和 Twisted 的用例，并给出一些案例代码。

javascript
const express = require('express');
const app = express();
app.get('/', (req, res) => {
  res.send('Hello, World!');
});
app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

javascript
const http = require('http');
const socketIO = require('socket.io');
const server = http.createServer();
const io = socketIO(server);
io.on('connection', (socket) => {
  console.log('A user connected');
  socket.on('chat message', (message) => {
    console.log('Received message:', message);
    io.emit('chat message', message);
  });
  socket.on('disconnect', () => {
    console.log('A user disconnected');
  });
});
server.listen(3000, () => {
  console.log('Server is running on port 3000');
});

python
from twisted.internet import protocol, reactor
class Echo(protocol.Protocol):
    def dataReceived(self, data):
        self.transport.write(data)
class EchoFactory(protocol.Factory):
    def buildProtocol(self, addr):
        return Echo()
reactor.listenTCP(3000, EchoFactory())
reactor.run()

python
from twisted.internet import defer, reactor
from twisted.web.client import getPage
@defer.inlineCallbacks
def crawl(url):
    try:
        response = yield getPage(url)
        print('Response:', response)
    except Exception as e:
        print('Error:', e)
def finish(result):
    reactor.stop()
d = crawl('http://example.com')
d.addBoth(finish)
reactor.run()