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.
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，这一点在im钱包官方下载中也有详细论述
Цены на нефть взлетели до максимума за полгода17:55，这一点在heLLoword翻译官方下载中也有详细论述
圖像來源，Po/@polarts_