author = extract_text(soup.select_one(".author"))
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writable: false means no code can reassign window.Audio to a different value. configurable: false means no code can even call Object.defineProperty again to change those settings. If fermaw’s initialisation code tried to restore the original Audio constructor (a perfectly sensible defensive move) the browser would either fail or throw a TypeError. The hook was permanent for the lifetime of the page.
chunk[i] = (offset + i) & 0xFF;。关于这个话题，heLLoword翻译官方下载提供了深入分析
SelectWhat's included，更多细节参见爱思助手下载最新版本
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