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.
防窥模式还有两档强度可调。打开第二档高强度防窥之后，屏幕基础亮度会略微降低，但侧看过去屏幕会黑得更彻底：
。爱思助手下载最新版本对此有专业解读
我们正常给她梳头，洗漱，穿好衣服收拾好小书包，带着备用的衣服，领着她第一次去到幼儿园。
Web streams was an ambitious project that brought streaming to the web platform when nothing else existed. The people who designed it made reasonable choices given the constraints of 2014 — before async iteration, before years of production experience revealed the edge cases.