一文带你了解Node.js有哪些架构模式

const express = require('express');
const app = express();
// Model
const items = [];
// View
app.get('/items', (req, res) => {
  res.json(items);
});
// Controller
app.post('/items', (req, res) => {
  const newItem = req.body;
  items.push(newItem);
  res.status(201).json(newItem);
});
app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

const express = require('express');
const app = express();
app.get('/api/books', (req, res) => {
  // Return a list of books
});
app.get('/api/books/:id', (req, res) => {
  // Return details of a specific book
});
app.post('/api/books', (req, res) => {
  // Create a new book
});
app.put('/api/books/:id', (req, res) => {
  // Update a book
});
app.delete('/api/books/:id', (req, res) => {
  // Delete a book
});
app.listen(3000, () => {
  console.log('RESTful API server is running on port 3000');
});

// Service 1
const express = require('express');
const app = express();
// Define service 1 routes and functionality
// Service 2
const express2 = require('express');
const app2 = express2();
// Define service 2 routes and functionality
// ...
app.listen(3001, () => {
  console.log('Service 1 is running on port 3001');
});
app2.listen(3002, () => {
  console.log('Service 2 is running on port 3002');
});

const express = require('express');
const http = require('http');
const socketIo = require('socket.io');
const app = express();
const server = http.createServer(app);
const io = socketIo(server);
io.on('connection', (socket) => {
  console.log('A user connected');
  socket.on('chat message', (message) => {
    io.emit('chat message', message);
  });
  socket.on('disconnect', () => {
    console.log('A user disconnected');
  });
});
server.listen(3000, () => {
  console.log('Chat server is running on port 3000');
});

const EventEmitter = require('events');
class MyEmitter extends EventEmitter {}
const myEmitter = new MyEmitter();
myEmitter.on('event', () => {
  console.log('An event occurred!');
});
myEmitter.emit('event');

const { ApolloServer, gql } = require('apollo-server');
const typeDefs = gql`
  type Query {
    hello: String
  }
`;
const resolvers = {
  Query: {
    hello: () => 'Hello, world!',
  },
};
const server = new ApolloServer({ typeDefs, resolvers });
server.listen().then(({ url }) => {
  console.log(`GraphQL server ready at ${url}`);
});