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获取用户手机号码解析问题?求大佬指教

微信小程序 获取用户手机号,第一次总会解密失败,第二次就好了,当我退出,再次登录后,又解密失败,刷新后再次登录又可以登录了,请问这是什么原因呢?

wx.login({
            success(res) {
               if (res.code) {
                  //发起网络请求
                  wx.request({
                     url: ''
                     method: 'GET',
                  }).then(resx => {
                     if (resx) {
                        wx.request({
                           url: '',
                           data: {
                              encryptedData: encryptedData,
                              iv: iv,
                              sessionKey: resx.data.session_key,
                           },
                           method: 'GET',
                        }).then(res => {
                           console.log(res, '获取用户手机号码');
                        })
                     }
                  })
               }
            }
         });
//服务端代码:这里调用微信提供的node.js的代码示例解密
getPhoneNumber : async (req, res) => {
      let appId = '';
      let sessionKey = req.query.sessionKey;
      let encryptedData = req.query.encryptedData;
      let iv = req.query.iv;
      let pc = new WXBizDataCrypt(appId, sessionKey);
      let data = pc.decryptData(encryptedData, iv);
      return await data;
   },

},

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