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.
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Jess Scott, part of the team behind Guilfest, an annual two-day music festival in Surrey, knows just how important connectivity is for both ticket holders and organizers, however large or small an event is.，详情可参考爱思助手下载最新版本