express get路由:如何实现DRY

const express = require('express');
const app = express();

// 中间件示例：记录请求日志
app.use((req, res, next) => {
  console.log(`${req.method} ${req.url}`);
  next();
});

// 使用中间件处理 GET 请求
app.get('/users/:id', (req, res) => {
  res.send(`User ID: ${req.params.id}`);
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

const express = require('express');
const app = express();

// 通用路由处理器函数
const getUserById = (req, res) => {
  res.send(`User ID: ${req.params.id}`);
};

// 使用通用路由处理器函数处理 GET 请求
app.get('/users/:id', getUserById);
app.get('/customers/:id', getUserById);

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

// routes/users.js
const express = require('express');
const router = express.Router();

router.get('/:id', (req, res) => {
  res.send(`User ID: ${req.params.id}`);
});

module.exports = router;

// app.js
const express = require('express');
const app = express();
const usersRouter = require('./routes/users');

app.use('/users', usersRouter);

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

app.use((req, res, next) => {
  console.log(`${req.method} ${req.url}`);
  next();
});

app.use('/users', usersRouter);

app.get('/users/:id', (req, res) => {
  res.send(`User ID: ${req.params.id}`);
});

app.get('/users', (req, res) => {
  res.send('List of users');
});