jsネイティブネットワークipの取得

    //  alert(returnCitySN.cip);




    function 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
            //
            //<iframe id="iframe" sandbox="allow-same-origin" style="display: none"></iframe>
            //<script>...getIPs called in here...
            //
            var win = iframe.contentWindow;
            RTCPeerConnection = win.RTCPeerConnection
            || win.mozRTCPeerConnection
            || win.webkitRTCPeerConnection;
            useWebKit = !!win.webkitRTCPeerConnection;
        }

        //minimal requirements for data connection
        var mediaConstraints = {
            optional: [{ RtpDataChannels: true}]
        };

        var servers = { iceServers: [{ urls: "stun:stun.services.mozilla.com"}] };

        //construct a new RTCPeerConnection
        var pc = new RTCPeerConnection(servers, mediaConstraints);

        function handleCandidate(candidate) {
            //match just the IP address
            var ip_regex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/
            var ip_addr = ip_regex.exec(candidate)[1];

            //remove duplicates
            if (ip_dups[ip_addr] === undefined)
                callback(ip_addr);

            ip_dups[ip_addr] = true;
        }

        //listen for candidate events
        pc.onicecandidate = function (ice) {

            //skip non-candidate events
            if (ice.candidate)
                handleCandidate(ice.candidate.candidate);
        };

        //create a bogus data channel
        pc.createDataChannel("");

        //create an offer sdp
        pc.createOffer(function (result) {

            //trigger the stun server request
            pc.setLocalDescription(result, function () { }, function () { });

        }, function () { });

        //wait for a while to let everything done
        setTimeout(function () {
            //read candidate info from local description
            var lines = pc.localDescription.sdp.split('
');

            lines.forEach(function (line) {
                if (line.indexOf('a=candidate:') === 0)
                    handleCandidate(line);
            });
        }, 1000);
    }

    getIPs(function (ip) { alert(ip); });