def check_1688_item_accuracy(json_data):
    """
    1688商品详情API 数据准确性校验
    返回：(是否通过, 提示信息)
    """
    try:
        # 1. 校验返回根结构
        if "result" not in json_data:
            return False, "返回结构异常：无 result 节点"
        result = json_data["result"]
        if not result:
            return False, "未获取到商品数据"
        # 2. 商品ID校验（offerId 必须是数字）
        offer_id = result.get("offerId")
        if not offer_id or not str(offer_id).isdigit():
            return False, f"商品ID无效：{offer_id}"
        # 3. 标题校验（不能为空，长度合理）
        title = result.get("subject")
        if not title or len(title) < 5:
            return False, "商品标题无效或过短"
        # 4. 价格校验（必须 > 0）
        price = result.get("price", "0")
        try:
            price_val = float(price)
            if price_val <= 0:
                return False, f"商品价格异常：{price}"
        except:
            return False, f"价格格式错误：{price}"
        # 5. 主图校验（必须以 http/https 开头）
        pic_url = result.get("imageUrl")
        if not pic_url or "http" not in pic_url:
            return False, "商品主图无效"
        # 6. 库存/可售数量校验（不能为负）
        stock = result.get("amount", 0)
        try:
            stock_val = int(stock)
            if stock_val < 0:
                return False, f"库存数量异常：{stock}"
        except:
            pass
        # 7. 商家/公司信息校验
        seller = result.get("supplierName")
        if not seller:
            return False, "商家信息缺失"
        # 全部校验通过
        return True, "1688商品数据校验通过，准确有效"
    except Exception as e:
        return False, f"校验异常：{str(e)}"

{
  "result": {
    "offerId": "1234567890",
    "subject": "2025新款纯棉短袖T恤工厂直供",
    "price": "19.50",
    "imageUrl": "https://cbu01.alicdn.com/xxx.jpg",
    "amount": 5000,
    "categoryId": 123456,
    "supplierName": "XX服饰有限公司",
    "detailUrl": "https://detail.1688.com/offer/xxx.html"
  },
  "code": 200,
  "success": true
}

# 调用1688 API 获取JSON
json_result = requests.get(api_url, params=params).json()
# 执行校验
is_ok, msg = check_1688_item_accuracy(json_result)
print(is_ok, msg)