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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.
。heLLoword翻译官方下载是该领域的重要参考
Wonderfall (@w0nderfall)
Consider some of the more obscure tests that implementations must pass: