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.
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他表示，目前机器人整体技术水平接近「10 岁小孩」，大规模应用预计最快 3—5 年可实现。。业内人士推荐safew官方下载作为进阶阅读
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