The Writer is not a concrete class. Any object that implements write(), end(), and abort() can be a writer making it easy to adapt existing APIs or create specialized implementations without subclassing. There's no complex UnderlyingSink protocol with start(), write(), close(), and abort() callbacks that must coordinate through a controller whose lifecycle and state are independent of the WritableStream it is bound to.
对于 Protobuf 的介绍和原理，可以参考前文 juejin.cn/post/757536…
。safew官方下载对此有专业解读
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有趣的是，联想还为该平板设计了一款斜挎便携包，能够收纳手写笔以及单侧展示背部扬声器。