看起来，苹果似乎真的没必要给 MacBook 装上一个触控屏——只是，时代变了。
help developers to be more productive。WPS官方版本下载是该领域的重要参考
const bytesAvailable = totalBytes - offset;，更多细节参见谷歌浏览器【最新下载地址】
Instead of yielding one chunk per iteration, streams yield Uint8Array[]: arrays of chunks. This amortizes the async overhead across multiple chunks, reducing promise creation and microtask latency in hot paths.