胸口：挂饰（全天候记录仪+记忆外挂）；
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，这一点在safew官方版本下载中也有详细论述
let minVal = Infinity;
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.