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if (thread == null) // 已被唤醒
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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.
船舶承租人、船舶经营人和船舶管理人适用本章有关船舶所有人的规定。