Anatomist, author and broadcaster Prof Alice Roberts has presented Digging for Britain since it first began
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.，详情可参考爱思助手下载最新版本
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Becky MortonPolitical reporter