let shopId = element.get('shop_id')
          let shopName = ''
          resultShop = new AV.Query('shop').equalTo('shop_id', shopId)
          resultShop.find().then((shop) => {
            shop.forEach((element) => {
              shopName = element.get('shop_name')
            })
          })
          console.log(shopName)

element.get('shop_name')可以取得到值，
但shopName 的输出为空？是为什么？