深入浅出Node.js：构建基于Express和Async/Await的REST API

mkdir express-api
cd express-api
npm init -y

npm install express body-parser cors

const express = require('express');
const bodyParser = require('body-parser');
const cors = require('cors');

const app = express();
const port = process.env.PORT || 3000;

// 中间件
app.use(bodyParser.json());
app.use(cors());

// 基本路由
app.get('/', (req, res) => {
  res.send('Hello World!');
});

// 启动服务器
app.listen(port, () => {
  console.log(`Server is running on port ${port}`);
});

let users = [
  { id: 1, name: 'Alice', age: 25 },
  { id: 2, name: 'Bob', age: 28 },
  { id: 3, name: 'Charlie', age: 22 }
];

app.post('/users', async (req, res) => {
  const user = req.body;
  user.id = users.length + 1;
  users.push(user);
  res.status(201).send(user);
});

app.get('/users', async (req, res) => {
  res.status(200).send(users);
});

app.put('/users/:id', async (req, res) => {
  const { id } = req.params;
  const { name, age } = req.body;
  
  const user = users.find(u => u.id === parseInt(id));
  if (user) {
    user.name = name;
    user.age = age;
    res.status(200).send(user);
  } else {
    res.status(404).send({ message: 'User not found' });
  }
});

app.delete('/users/:id', async (req, res) => {
  const { id } = req.params;
  
  users = users.filter(u => u.id !== parseInt(id));
  res.status(204).send();
});