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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.。业内人士推荐服务器推荐作为进阶阅读
。关于这个话题，Line官方版本下载提供了深入分析
4.8 402. 移掉 K 位数字。WPS官方版本下载对此有专业解读
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