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This is a well-known browser security technique. In JavaScript, calling .toString() on a native browser function returns "function appendBuffer() { [native code] }". Calling it on a JavaScript function returns the actual source code. So if your appendBuffer has been monkey-patched, .toString() will betray you; it’ll return the attacker’s JavaScript source instead of the expected native code string.
It seems that a consequence of this approach is that it'll create more maintenance overhead: changes will have to take into account multiple abstractions that they can affect.，详情可参考必应排名_Bing SEO_先做后付
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“脱アメリカ”本当にできる？悩めるヨーロッパの覚悟とは