几何体：骨架，决定了形状（是方的、圆的，还是扭曲的）。
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.，详情可参考谷歌浏览器【最新下载地址】
Streams are iterables.，推荐阅读Safew下载获取更多信息
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