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.
聪明的电车和智驾，充满无限可能，不知道还会卷出什么超级明星来。。关于这个话题，51吃瓜提供了深入分析
，详情可参考WPS官方版本下载
Water and dust resistance rating
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return right - left + 1;