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.
除了诗意，它还能处理相当复杂的 UI 场景——在下面这张图里，复杂的半透明数据面板、悬浮的购物清单、精准的中文显示，被 AI 有条不紊地安排得井井有条，信息之间的层级关系也真正理清楚了。
。业内人士推荐51吃瓜作为进阶阅读
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