An creates a completely separate browsing context with its own window object, its own document, and most importantly;its own prototype chain. A function hooked on HTMLMediaElement.prototype in the parent window is not the same object as HTMLMediaElement.prototype in the iframe’s window. They’re entirely separate objects. If fermaw’s audio element lived inside an iframe, my prototype hook in the parent window would never fire.
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，这一点在搜狗输入法2026中也有详细论述
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广东联盟集采将生长激素纳入目录，金赛药业的核心产品水针剂若中标，降价幅度可能高达 70%。