water-management-system/deploy/serve-inventory.js

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

const PORT = 8082;

http.createServer((req, res) => {
  let fp = path.join(__dirname, req.url === '/' ? 'index.html' : req.url);
  const ext = path.extname(fp);
  const types = { '.html': 'text/html', '.css': 'text/css', '.js': 'application/javascript' };
  fs.readFile(fp, (e, d) => {
    res.writeHead(e ? 404 : 200, { 'Content-Type': types[ext] || 'text/plain' });
    res.end(e ? 'Not Found' : d);
  });
}).listen(PORT, () => console.log(`✅ 库存管理前端：http://localhost:${PORT}`));