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.
Мир Российская Премьер-лига|19-й тур
，更多细节参见safew官方版本下载
第一百零六条 本章下列用语的含义：，详情可参考WPS官方版本下载
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优点：计算简单，导数恒为1（正区间），缓解梯度消失