如何在没有框架的情况下通过路由渲染模板

const http = require('http');
const fs = require('fs');

// 定义路由规则
const routes = {
  '/': (req, res) => {
    const template = fs.readFileSync('templates/index.html', 'utf8');
    const rendered = template.replace('{{content}}', 'Hello, World!');
    res.writeHead(200, { 'Content-Type': 'text/html' });
    res.end(rendered);
  },
  '/about': (req, res) => {
    const template = fs.readFileSync('templates/about.html', 'utf8');
    const rendered = template.replace('{{content}}', 'About Us');
    res.writeHead(200, { 'Content-Type': 'text/html' });
    res.end(rendered);
  },
  '/contact': (req, res) => {
    const template = fs.readFileSync('templates/contact.html', 'utf8');
    const rendered = template.replace('{{content}}', 'Contact Us');
    res.writeHead(200, { 'Content-Type': 'text/html' });
    res.end(rendered);
  },
  // 其他路由规则...
};

// 创建HTTP服务器
const server = http.createServer((req, res) => {
  const routeHandler = routes[req.url];
  if (routeHandler) {
    routeHandler(req, res);
  } else {
    res.writeHead(404, { 'Content-Type': 'text/plain' });
    res.end('Not Found');
  }
});

// 监听端口
server.listen(3000, () => {
  console.log('Server is running on port 3000');
});