如何在两个html页面之间传输表单数据？

document.getElementById("submitBtn").addEventListener("click", function() {
  var name = document.getElementById("nameInput").value;
  var email = document.getElementById("emailInput").value;
  var url = "pageB.html?name=" + encodeURIComponent(name) + "&email=" + encodeURIComponent(email);
  window.location.href = url;
});

<form action="pageB.html" method="POST">
  <input type="text" name="name" placeholder="姓名">
  <input type="email" name="email" placeholder="邮箱">
  <input type="submit" value="提交">
</form>

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

app.use(express.urlencoded({ extended: true }));

app.post('/pageB.html', (req, res) => {
  const name = req.body.name;
  const email = req.body.email;
  // 处理表单数据
  // ...
  // 返回处理结果
  res.send('处理结果');
});

app.listen(3000, () => {
  console.log('服务器已启动');
});

document.getElementById("submitBtn").addEventListener("click", function() {
  var name = document.getElementById("nameInput").value;
  var email = document.getElementById("emailInput").value;
  localStorage.setItem("name", name);
  localStorage.setItem("email", email);
});

window.addEventListener("load", function() {
  var name = localStorage.getItem("name");
  var email = localStorage.getItem("email");
  document.getElementById("nameInput").value = name;
  document.getElementById("emailInput").value = email;
});