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.
fact making CICS a very notable early real-time computing system), it was also a，这一点在safew官方版本下载中也有详细论述
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IBM had already built document processing machines that interacted with their，详情可参考谷歌浏览器【最新下载地址】