▲ 图源：9To5Google
The V3 approach obliterates this race condition by hooking addSourceBuffer at the MediaSource.prototype level, I intercept the creation of every SourceBuffer. The moment a buffer is created and returned, I immediately install a hooked appendBuffer directly on that specific instance; before any page code can even see the instance, let alone cache a reference to its methods. The hooked appendBuffer is installed as an own property of the instance, which takes precedence over the prototype chain. There is no window for fermaw to cache the original. The hook is always first.
。关于这个话题，夫子提供了深入分析
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第八条 行政执法监督机构应当严格依法履行监督职责，不得以监督代替行政执法，不得滥用职权干预行政执法，避免增加行政执法机关负担。