微信授权不同域名

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

app.get('/auth/wechat', (req, res) => {
  const { code } = req.query;
  if (!code) {
    res.redirect('https://open.weixin.qq.com/connect/oauth2/authorize?appid=YOUR_APP_ID&redirect_uri=YOUR_REDIRECT_URI&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect');
  } else {
    axios.get(`https://api.weixin.qq.com/sns/oauth2/access_token?appid=YOUR_APP_ID&secret=YOUR_APP_SECRET&code=${code}&grant_type=authorization_code`)
      .then(response => {
        const { access_token, openid } = response.data;
        axios.get(`https://api.weixin.qq.com/sns/userinfo?access_token=${access_token}&openid=${openid}`)
          .then(userResponse => {
            res.send(userResponse.data);
          })
          .catch(err => {
            res.status(500).send(err);
          });
      })
      .catch(err => {
        res.status(500).send(err);
      });
  }
});

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