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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.，详情可参考爱思助手下载最新版本
stack.pop(); // 弹出无效候选值，这一点在同城约会中也有详细论述
居民选举委员会成员退出居民选举委员会或者因其他原因出缺的，按照原推选结果依次递补，也可以另行推选。，推荐阅读im钱包官方下载获取更多信息
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