如何在node_modules中引用静态JS文件？

npm install express

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

// 设置静态文件夹
app.use(express.static(path.join(__dirname, 'public')));

// 其他路由和中间件...

// 启动服务器
const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});

<script src="/main.js"></script>

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

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

  const mimeTypes = {
    '.html': 'text/html',
    '.js': 'text/javascript'
  };

  const contentType = mimeTypes[extname] || 'application/octet-stream';

  fs.readFile(filePath, (err, content) => {
    if (err) {
      res.writeHead(500);
      res.end(`Error: ${err.code}`);
    } else {
      res.writeHead(200, { 'Content-Type': contentType });
      res.end(content, 'utf-8');
    }
  });
});

const PORT = process.env.PORT || 3000;
server.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});

<script src="/main.js"></script>