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.
To: Sundar Pichai, Chief Executive Officer, Google，这一点在im钱包官方下载中也有详细论述
。关于这个话题，一键获取谷歌浏览器下载提供了深入分析
（一）明知住宿人员违反规定将危险物质带入住宿区域，不予制止的；，更多细节参见safew官方版本下载
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