微信小程序获取到Openid

前台代码片段

onLoad: function () {

    wx.login({

      success(res) {

        console.log('code: '+res.code)

        if (res.code) {

          wx.request({

            url: 'http://localhost:1996/pay',

            data:{

              code: res.code

            },

            success(res) {

              console.log(res.data)

            }

          });

        } else {

          console.log('登录失败！' + res.errMsg)

        }

      }

    });

  },

后台代码片段

const Router = require('koa-router');

const router = new Router();

const request = require('request');

function getOpenId(code) {

  return new Promise((resolve, reject) => {

    const id = 'wxbd53208a40c5d51c'; // AppID(小程序ID)

    const secret = '92fea41a425cc8ff9d9596c434ec67fb';// AppSecret(小程序密钥)

    let url = `https://api.weixin.qq.com/sns/jscode2session?appid=${id}&secret=${secret}&js_code=${code}&grant_type=authorization_code`;

    request(url, (error, response, body) => {

      if (error) reject(error);

      resolve(body);

    });

  })

}

let index = router.get('/pay', async (ctx, next) => {

  await next();

  ctx.set("Access-Control-Allow-Origin", '*');

  ctx.status = 200;

  ctx.type = 'json';

  if (ctx.query) {

    const {

      code

    } = ctx.query;

    const data = await getOpenId(code);

    ctx.body = data;

  }

}).routes();

module.exports = index;