What TransformStreams are supposed to do is check for backpressure on the controller and use promises to communicate that back to the writer:
Google 的 AppFunctions 也是同理。，这一点在旺商聊官方下载中也有详细论述
虽然你自己看过去防窥，但想给家里人看个照片、给店员看个排队号、给收银机扫个付款码，都会造成极大的不便。，更多细节参见搜狗输入法下载
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