客户端：

  getPhoneNumber: function (e) {
 var that = this;
 if (that.data.phoneNumber) {
      wx.showModal({
        content: '我们会在5分钟左右联系您',
        showCancel: false
      })
 return
    }
 if (!e.detail.errMsg || e.detail.errMsg != "getPhoneNumber:ok") {
      wx.showModal({
        content: '无法获取手机号码',
        showCancel: false
      })
 return;
    }
    wx.showLoading({
      title: '获取中...',
    })
    wx.cloud.callFunction({
      name: 'token',
      data: {
        encryptedData: e.detail.encryptedData,
        iv: e.detail.iv,
        sessionCode: app.globalData.sessionCode
      },
      success: res => {
        that.data.phoneNumber = res.result
        wx.hideLoading()
        wx.showModal({
          content: '我们会在5分钟左右联系您',
          showCancel: false
        })
      },
      fail: err => {
        console.error(err);
        wx.showToast({
          title: '获取失败',
          icon: 'none'
        })
      }
    })
  }

服务端：

 let key = ''
    options = {
      method: 'GET',
      uri: 'https://api.weixin.qq.com/sns/jscode2session?appid=' + appId + '&secret=' + secret + '&js_code=' + sessionCode + '&grant_type=authorization_code',
      json: true
    }
 await rp(options).then(res => {
      console.log(res)
      key = res.session_key
    })
 var decipher = crypto.createDecipheriv('aes-128-cbc', new Buffer(key, 'base64'), new Buffer(iv, 'base64'));
 var decoded = decipher.update(new Buffer(encryptedData, 'base64'), 'binary', 'utf8');
    decoded += decipher.final('utf8');
 await db.collection(dataBaseType)
      .where({ _openid: openId })
      .update({
        data:
        {
          phoneNumber: JSON.parse(decoded).phoneNumber
        },
      })
 return JSON.parse(decoded).phoneNumber