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.
The std:web/console interface does not exist today, but would hypothetically come from the official WebIDL that browsers use for describing Web APIs. This particular interface might look like this:，这一点在雷电模拟器官方版本下载中也有详细论述
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