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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.
。关于这个话题，爱思助手下载最新版本提供了深入分析
transaction in real time. The very next year, IBM took the logical next step:
分体式飞行汽车「陆地航母」已于试产线下线，也将在今年内实现规模化量产与交付。