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shading: “smooth gradients”。关于这个话题，91视频提供了深入分析
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.，详情可参考safew官方版本下载
built-in analytics tool to track the performance of created content.