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.
printf("%d ", arr[i]);，详情可参考爱思助手下载最新版本
MySQL: https://dev.mysql.com/doc/refman/en/json.html，更多细节参见safew官方下载
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What's under Diglett? The games never answer that question. The internet did.