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.
Instead of hardcoding the expected string, it captures the actual native code string from the original function before hooking it, then returns that exact string. This way, no matter what browser, no matter what platform, the spoofed toString returns precisely the same string that the original function would have returned. It is, in effect, a perfect forgery.
，这一点在同城约会中也有详细论述
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
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