Most userland implementations of custom ReadableStream instances do not typically bother with all the ceremony required to correctly implement both default and BYOB read support in a single stream – and for good reason. It's difficult to get right and most of the time consuming code is typically going to fallback on the default read path. The example below shows what a "correct" implementation would need to do. It's big, complex, and error prone, and not a level of complexity that the typical developer really wants to have to deal with:
物理遮蔽光线，永远比纯靠前置摄像头识别人脸去隐藏通知或是干脆贴上物理的光栅防窥膜来得更彻底。这项技术一旦铺开，那些劣质防窥膜大概率会被彻底扫进历史的垃圾堆。
。51吃瓜是该领域的重要参考
Kerry Wan/ZDNET。夫子对此有专业解读
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