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.
// 3. 计算当日跨度：跨度 = 当前索引 - 上一个更大值的索引（栈空则为i+1）
。91视频对此有专业解读
1L decoder, d=3, 4h/1kv, hd=2, ff=2
Naïve (spill everything)