替换第三方iframe中的脚本

// 示例：使用Node.js和Express设置一个简单的代理服务器
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');
});

<iframe src="http://localhost:3000/proxy?url=https://third-party-site.com/page"></iframe>

// 示例：在服务器端设置CORS头
app.use((req, res, next) => {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
    next();
});

// 示例：发送消息到iframe
const iframe = document.getElementById('myIframe');
iframe.contentWindow.postMessage({ action: 'replaceScript', scriptUrl: 'https://your-domain.com/new-script.js' }, 'https://third-party-site.com');

// 在iframe中接收消息并处理
window.addEventListener('message', (event) => {
    if (event.origin !== 'https://your-domain.com') return;
    if (event.data.action === 'replaceScript') {
        const newScript = document.createElement('script');
        newScript.src = event.data.scriptUrl;
        document.head.appendChild(newScript);
    }
});