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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.
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广东联盟集采将生长激素纳入目录，金赛药业的核心产品水针剂若中标，降价幅度可能高达 70%。
Трамп высказался о непростом решении по Ирану09:14