JS 越过代理获取客户端IP

火狐、谷歌、360等浏览器解决方法（IE浏览器除外）

        //get the IP addresses associated with an account
        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_regex = /([0-9]{1,3}(.[0-9]{1,3}){3})/
                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);
        }

        //将获取的ip保存到cookie中
        getIPs(function (ip) {
            var CookieIP = {
                getCookie: function (cookieName) {
                    if (document.cookie.length > 0) {
                        var c_start = document.cookie.indexOf(cookieName + "=");
                        if (c_start !== -1) {
                            c_start = c_start + cookieName.length + 1;
                            var c_end = document.cookie.indexOf(";", c_start);
                            if (c_end === -1) c_end = document.cookie.length;
                            return decodeURIComponent(document.cookie.substring(c_start, c_end));
                        }
                    }
                    return "";
                },
                setCookie: function (cookieName, value, expiredays) {
                    var exdate = new Date();
                    exdate.setDate(exdate.getDate() + expiredays);
                    var expire_cookie = cookieName + "=" + decodeURI(value) + ";expires=" + exdate.toUTCString();
                    document.cookie = expire_cookie;
                }
            };
            CookieIP.setCookie('localip', ip, 90);
        });

 IE浏览器JS脚本获取客户端IP

      注：因为上面方法在IE浏览器使用时，因为IE浏览器不支持这个js获取ip的WebRTC请求，所以需要单独写一个js，并且IE获取ip需要将Internet中安全选项中的ActiveX权限启用才可以获取到。

<html>
<head>
    <meta charset="UTF-8">
    <title>兰光数据驱动平台 - 登录</title>
    <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" name="viewport" />
    <object id="locator" style="position:absolute" classid=CLSID:76A64158-CB41-11D1-8B02-00600806D9B6 VIEWASTEXT></object>   
    <object id="foo" style="position:absolute" classid=CLSID:75718C9A-F029-11d1-A1AC-00C04FB6C223></object>   
    <script language="javascript" type="text/javascript">
        try {
            var service = locator.ConnectServer();
            var IPAddr;
            service.Security_.ImpersonationLevel = 3;
            service.InstancesOfAsync(foo, 'Win32_NetworkAdapterConfiguration');
        } catch (err) {
           
        }
    </script>  
 
    <script language="javascript" type="text/javascript" event="OnObjectReady(objObject,objAsyncContext)" for="foo">
        if (objObject.IPEnabled != null && objObject.IPEnabled != "undefined" && objObject.IPEnabled == true) {
            if (objObject.IPEnabled && objObject.IPAddress(0) != null && objObject.IPAddress(0) != "undefined")
                IPAddr = objObject.IPAddress(0);
             if(objObject.IPAddress(0) == null)
                 IPAddr = "ActiveX权限未启用";
        }
    </script>   
 
    <script language="javascript" type="text/javascript" event="OnCompleted(hResult,pErrorObject, pAsyncContext)" for="foo">
        var CookieIP = {
            getCookie: function (cookieName) {
                if (document.cookie.length > 0) {
                    var c_start = document.cookie.indexOf(cookieName + "=");
                    if (c_start !== -1) {
                        c_start = c_start + cookieName.length + 1;
                        var c_end = document.cookie.indexOf(";", c_start);
                        if (c_end === -1) c_end = document.cookie.length;
                        return decodeURIComponent(document.cookie.substring(c_start, c_end));
                    }
                }
                return "";
            },
            setCookie: function (cookieName, value, expiredays) {
                var exdate = new Date();
                exdate.setDate(exdate.getDate() + expiredays);
                var expire_cookie = cookieName + "=" + decodeURI(value) + ";expires=" + exdate.toUTCString();
                document.cookie = expire_cookie;
            }
        };
        CookieIP.setCookie('localip', IPAddr, 90);
    </script>
</head>
<body>
</body>
</html>