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.
而对于写作来说，我会在初期利用它头脑风暴帮我想一些写作角度，再根据我想写的核心，自己归纳好大纲，然后开始写作。
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Photograph: Julian Chokkattu
It’s two decimal digits long, it’s prime, it’s a palindrome and it’s the number of players in a football team.