小程序获取二维码

 function requireFunction() {
      var p = new Promise((resolve, reject) => {
        request({
          method: 'POST',
          headers: { 'Content-Type': 'image/jpeg' },
          encoding: 'base64',
          url: 'https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=' + sessionData.access_token,
          body: { 
             scene: scene, 
             page: page   //本地使用path，上线是page...frank...to be tested!!1
            },
          json:true
        }, function(error, res, body) {
            if (!error && res.statusCode == 200) { resolve(body) }else { reject(error) }
        });
      }).catch(function (error) {  return error })
      return p
    }