wx.login({
      success: function (res) {
       console.log(res.code)
       if (res.code) {
        wx.getUserInfo({
         withCredentials: true,
         success: function (res_user) {
          wx.request({
           //后台接口地址
           url: 'https://....com/wx/login',
           data: {
            code: res.code,
            encryptedData: res_user.encryptedData,
            iv: res_user.iv
           },
           method: 'GET',
           header: {
            'content-type': 'application/json'
           },
           success: function (res) {
            // this.globalData.userInfo = JSON.parse(res.data);
            that.setData({
             nickName: res.data.nickName,
             avatarUrl: res.data.avatarUrl,
            })
            wx.setStorageSync('openId', res.data.openId);

           }
          })
         }