如何在chrome扩展和Node服务器之间启用跨域AJAX请求？

"permissions": [
    "http://localhost:3000/*"
]

var xhr = new XMLHttpRequest();
xhr.open("GET", "http://localhost:3000/api/data", true);
xhr.withCredentials = true; // 允许发送和接收cookie
xhr.send();

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

const app = express();
app.use(cors({
  origin: 'http://localhost:8000', // 允许的源地址
  credentials: true, // 允许发送和接收cookie
}));

// 处理跨域请求
app.get('/api/data', (req, res) => {
  res.send('Hello from Node server!');
});

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