Få fram lokalt IP-nummer som stringvariabel (JavaScript)

window.RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;   //compatibility for firefox and chrome
    var pc = new RTCPeerConnection({iceServers:[]}), noop = function(){};      
    pc.createDataChannel("");    //create a bogus data channel
    pc.createOffer(pc.setLocalDescription.bind(pc), noop);    // create offer and set local description
    pc.onicecandidate = function(ice){  //listen for candidate events
        if(!ice || !ice.candidate || !ice.candidate.candidate)  return;
        var myIP = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/.exec(ice.candidate.candidate)[1];
        console.log('my IP: ', myIP);   
        pc.onicecandidate = noop;
    };

function getLocalIPAddress() {
    window.RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection; //compatibility for firefox and chrome
    var pc = new RTCPeerConnection({iceServers:[]}), noop = function(){};
    pc.createDataChannel(""); //create a bogus data channel
    pc.createOffer(pc.setLocalDescription.bind(pc), noop); // create offer and set local description
    var myIP;
    pc.onicecandidate = function(ice){ //listen for candidate events
        if(!ice || !ice.candidate || !ice.candidate.candidate) return;
        myIP = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/.exec(ice.candidate.candidate)[1];
        pc.onicecandidate = noop;
    };
    return myIP;
}

//Clicking button
$("button").click(function() {
    $("input").removeClass("enter");
    $("input").addClass("enter");
    var $textArea = $("input");
    //Entered texts value
    var oldText = $textArea.val();
    //Entered texts value, with words replaced
    var newText = oldText.replace("localhost", getLocalIPAddress());
    //Replace old value with new value and select it
    $textArea.val(newText).select();
    //Copy new text to clipboard and view new text in textarea
    document.execCommand('copy');
    $textArea.val(newText);
});