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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.
。WPS官方版本下载是该领域的重要参考
类似整理扑克牌：每次拿一张新牌，插入到已排好序的牌堆中合适位置
const chunk = new Uint8Array(chunkSize);
13 February 2026ShareSave