axios跨域怎么解决

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

app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*'); // 允许所有源访问
  res.header('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
  res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization');
  next();
});

app.get('/data', (req, res) => {
  res.json({ message: 'This is data from the server.' });
});

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

axios.get('http://localhost:3000/data')
  .then(response => {
    console.log(response.data);
  })
  .catch(error => {
    console.error('There was an error!', error);
  });

// vue.config.js
module.exports = {
  devServer: {
    proxy: {
      '/api': {
        target: 'http://localhost:3000',
        changeOrigin: true,
        pathRewrite: { '^/api': '' }
      }
    }
  }
};

axios.get('/api/data')
  .then(response => {
    console.log(response.data);
  })
  .catch(error => {
    console.error('There was an error!', error);
  });