Invalid data errors. You can usually assume your database will give back valid data. If it doesn’t, you’ve probably got a bug somewhere.
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"items": ["annual_subscription"],，更多细节参见服务器推荐
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.