cart元素的generated属性是在cart序列化为XML时生成的一个时间戳，检查它可以保证新的购物车数据不会被旧的数据覆盖。
The generated attribute on the cart element, a timestamp created when the cart was serialized to XML, is checked to ensure that newer cart data is not overwritten by older cart data.
cart元素的generated属性是在cart序列化为XML时生成的一个时间戳，检查它可以保证新的购物车数据不会被旧的数据覆盖。
The generated attribute on the cart element, a timestamp created when the cart was serialized to XML, is checked to ensure that newer cart data is not overwritten by older cart data.
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