swap(&arr[i], &arr[j]);
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.，更多细节参见搜狗输入法下载
。im钱包官方下载对此有专业解读
2. Tap the three dots at the top right corner and select Extension.
This works, but it's slow.，推荐阅读heLLoword翻译官方下载获取更多信息
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