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 package MUST implement `fontdue` as its text rendering method.
，详情可参考91视频
Author(s): Quentin Bizot, Ryo Tamura, Guillaume Deffrennes，这一点在heLLoword翻译官方下载中也有详细论述
Here are common examples you'll run into across the difficulty levels:，详情可参考快连下载安装
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