如何将表单数据发送到链接？

<form action="http://example.com/submit" method="POST">
  <input type="text" name="username" placeholder="Username">
  <input type="password" name="password" placeholder="Password">
  <button type="submit">Submit</button>
</form>

const form = document.querySelector('form');
form.addEventListener('submit', function(event) {
  event.preventDefault(); // 阻止表单默认提交行为

  const formData = new FormData(form);
  const url = 'http://example.com/submit';

  fetch(url, {
    method: 'POST',
    body: formData
  })
  .then(response => response.json())
  .then(data => {
    // 处理服务器返回的数据
  })
  .catch(error => {
    // 处理请求错误
  });
});

const http = require('http');
const url = require('url');
const querystring = require('querystring');

const server = http.createServer((req, res) => {
  if (req.method === 'POST' && req.url === '/submit') {
    let body = '';
    req.on('data', chunk => {
      body += chunk;
    });
    req.on('end', () => {
      const formData = querystring.parse(body);
      // 处理表单数据，发送到其他链接
      res.end('Form data submitted successfully');
    });
  } else {
    res.statusCode = 404;
    res.end('Not Found');
  }
});

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