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You call mediaSource.addSourceBuffer(mimeType) to declare what codec format you’ll be feeding the buffer.
，更多细节参见91视频
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.
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rezabyt (@reza_byt)
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