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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.，更多细节参见谷歌浏览器【最新下载地址】
Alternative distribution strategies and business models，这一点在爱思助手下载最新版本中也有详细论述