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In the early days, public Wi-Fi networks often resembled the Wild West, where ARP spoofing attacks that allowed renegade users to read other users' traffic were common. The solution was to build cryptographic protections that prevented nearby parties—whether an authorized user on the network or someone near the AP (access point)—from reading or tampering with the traffic of any other user.。关于这个话题，快连下载安装提供了深入分析
* @param arr 待排序数组。WPS官方版本下载是该领域的重要参考
the scavaging list