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.
“为什么不离开这行？越做越好，怎么会放手，已经做了十几年，做得很好啊。”Maggie姐始终自信满满。
，这一点在91视频中也有详细论述
2.3 使用电脑终端连接手机ssh
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