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

const server = http.createServer((req, res) => {
  let filePath = req.url === '/' ? '/index.html' : req.url;
  filePath = path.join(__dirname, filePath);

  const extname = path.extname(filePath);
  let contentType = 'text/html';

  switch (extname) {
    case '.js':
      contentType = 'text/javascript';
      break;
    case '.css':
      contentType = 'text/css';
      break;
    case '.json':
      contentType = 'application/json';
      break;
  }

  fs.readFile(filePath, (err, content) => {
    if (err) {
      if (err.code === 'ENOENT') {
        res.writeHead(404);
        res.end('文件未找到');
      } else {
        res.writeHead(500);
        res.end('服务器错误');
      }
    } else {
      res.writeHead(200, { 'Content-Type': contentType });
      res.end(content, 'utf-8');
    }
  });
});

const PORT = 8080;
server.listen(PORT, () => {
  console.log(`服务器运行在 http://localhost:${PORT}`);
});