下载文件时出现Node.js问题-文件名

const encodedFileName = encodeURIComponent(fileName);

const path = require('path');
const filePath = path.join(__dirname, 'files', fileName);

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

http.createServer((req, res) => {
  const fileName = 'example.txt';
  const filePath = path.join(__dirname, 'files', fileName);

  fs.readFile(filePath, (err, data) => {
    if (err) {
      res.statusCode = 500;
      res.end('Internal Server Error');
    } else {
      res.setHeader('Content-Disposition', `attachment; filename="${fileName}"`);
      res.end(data);
    }
  });
}).listen(3000, () => {
  console.log('Server is running on port 3000');
});