The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
这意味着，行业劳动力正从提供标准化讲解的“流水线工人”，向提供个性化服务的“旅行策划师”升级，这是产业价值提升最坚实的微观基础。
，详情可参考51吃瓜
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