js 获得网页源码

fetch(window.location.href)
  .then(response => response.text())
  .then(html => {
    console.log(html); // 这里就是网页的源码
  })
  .catch(error => {
    console.error('Error fetching the HTML:', error);
  });

var sourceCode = document.documentElement.outerHTML;
console.log(sourceCode); // 这里就是网页的源码

var xhr = new XMLHttpRequest();
xhr.open('GET', window.location.href, true);
xhr.onreadystatechange = function() {
  if (xhr.readyState === 4 && xhr.status === 200) {
    console.log(xhr.responseText); // 这里就是网页的源码
  }
};
xhr.send();

// server.js (Node.js)
const express = require('express');
const request = require('request');
const app = express();

app.get('/proxy', (req, res) => {
  const url = req.query.url;
  request(url).pipe(res);
});

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

fetch('http://localhost:3000/proxy?url=' + encodeURIComponent(window.location.href))
  .then(response => response.text())
  .then(html => {
    console.log(html); // 这里就是网页的源码
  })
  .catch(error => {
    console.error('Error fetching the HTML:', error);
  });