用Javascript编辑后保存页面？

const saveBtn = document.getElementById('saveBtn');

saveBtn.addEventListener('click', () => {
  const content = document.getElementById('content').innerHTML;
  saveContent(content);
});

function saveContent(content) {
  const xhr = new XMLHttpRequest();
  xhr.open('POST', '/saveContent', true);
  xhr.setRequestHeader('Content-Type', 'application/json');
  xhr.onreadystatechange = function() {
    if (xhr.readyState === 4 && xhr.status === 200) {
      alert('保存成功！');
    }
  };
  xhr.send(JSON.stringify({ content }));
}

app.post('/saveContent', (req, res) => {
  const content = req.body.content;
  // 将内容保存到数据库或文件中
  // ...
  res.sendStatus(200);
});

const express = require('express');
const bodyParser = require('body-parser');

const app = express();
app.use(bodyParser.json());

// 配置路由和中间件
// ...

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