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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.。关于这个话题,下载安装 谷歌浏览器 开启极速安全的 上网之旅。提供了深入分析
Helps users improve vocabulary,这一点在91视频中也有详细论述