koa框架生成微信公众号二维码

// 获取全局token
router.get('/token', async (ctx, next) => {
  try {
    let appid = 'wx36963a5a84d5ca4d'
    let secret = '98431bcb5cac6b46ef132b6f544a11dd'
    let opts = {
      url: 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=' + appid + '&secret=' + secret
    }
    let res = await rp(opts)
    res = JSON.parse(res)
    let token = res.access_token
    ctx.data = { token: token }
  } catch (e) {
    console.log(e)
  }
  await next()
})

router.get('/qrcode', async (ctx, next) => {
  let token = ctx.req.token
  let opts = {
    method: 'post',
    form: '{"expire_seconds": 604800, "action_name": "QR_STR_SCENE", "action_info": {"scene": {"scene_str": 123 }}}',
    uri: 'https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=' + token
  }
  let res = await rp(opts)
  console.log(res)
  ctx.data = res
  await next()
})

https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=your ticket