如何在URL路径中使用Id。

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

app.get('/items/:id', (req, res) => {
  const itemId = req.params.id;
  // 使用itemId来获取和处理数据
  res.send(`Item ID: ${itemId}`);
});

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

const itemId = 123;
const url = `/items/${itemId}`;

import { Link } from 'react-router-dom';

function ItemList({ items }) {
  return (
    <ul>
      {items.map(item => (
        <li key={item.id}>
          <Link to={`/items/${item.id}`}>{item.name}</Link>
        </li>
      ))}
    </ul>
  );
}

import { BrowserRouter as Router, Route, Link } from 'react-router-dom';

function App() {
  return (
    <Router>
      <nav>
        <Link to="/items">Items</Link>
      </nav>
      <Route path="/items/:id" component={ItemDetail} />
    </Router>
  );
}

function ItemList({ items }) {
  return (
    <ul>
      {items.map(item => (
        <li key={item.id}>
          <Link to={`/items/${item.id}`}>{item.name}</Link>
        </li>
      ))}
    </ul>
  );
}

function ItemDetail({ match }) {
  const { id } = match.params;
  // 使用id来获取和显示详细信息
  return <div>Item Detail for ID: {id}</div>;
}

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

app.get('/items/:id', (req, res) => {
  const itemId = req.params.id;
  // 查询数据库或其他逻辑
  const item = getItemById(itemId); // 假设这是一个获取数据的函数
  res.json(item);
});

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