1. 获取内网ip，即路由器分配的地址，局域网内部具有唯一性

http://net.ipcalf.com/ 显示本机内网ip地址
此网站可以获取用户的内网ip，但是必须设置浏览器的配置，现在浏览器都默认隐藏ip地址

不设置时显示和设置后显示

1. 谷歌浏览器设置

chrome://flags/#enable-webrtc-hide-local-ips-with-mdns

但是也有人说

2. 360浏览器设置

se://flags/#enable-webrtc-hide-local-ips-with-mdns

3. 火狐浏览器

在地址栏中输入：absout:config
搜索配置media.peerconnection.ice.obfuscate_host_addresses 改为false

4. 网址代码提取

var RTCPeerConnection = window.webkitRTCPeerConnection || window.mozRTCPeerConnection;

if (RTCPeerConnection) (function () {
    var rtc = new RTCPeerConnection({ iceServers: [] });
    if (1 || window.mozRTCPeerConnection) {
        rtc.createDataChannel('', { reliable: false });
    };

    rtc.onicecandidate = function (evt) {
        if (evt.candidate) grepSDP("a=" + evt.candidate.candidate);
    };
    rtc.createOffer(function (offerDesc) {
        grepSDP(offerDesc.sdp);
        rtc.setLocalDescription(offerDesc);
    }, function (e) { console.warn("offer failed", e); });


    var addrs = Object.create(null);
    addrs["0.0.0.0"] = false;
    function updateDisplay(newAddr) {
        if (newAddr in addrs) return;
        else addrs[newAddr] = true;
        var displayAddrs = Object.keys(addrs).filter(function (k) { return addrs[k]; });
        console.log(displayAddrs.join(" or perhaps ") || "n/a", 'ip地址');
    }

    function grepSDP(sdp) {
        var hosts = [];
        sdp.split('\r\n').forEach(function (line) {
            if (~line.indexOf("a=candidate")) {
                var parts = line.split(' '),
                    addr = parts[4],
                    type = parts[7];
                if (type === 'host') updateDisplay(addr);
            } else if (~line.indexOf("c=")) {
                var parts = line.split(' '),
                    addr = parts[2];
                updateDisplay(addr);
            }
        });
    }
})();

2. 获取外网ip，即公网ip，具有世界范围的唯一性

http://api.ipify.org 此接口可以直接获取公网ip地址

axios.get('http://api.ipify.org').then(res => {
        if (res.data) {
            console.log(res.data, '公网ip')
        }
    }).catch((e) => {
    })

https://ipv4.icanhazip.com/ 也可以

3. 参考链接

		https://blog.csdn.net/qq_21901233/article/details/107369852
		https://www.cnblogs.com/Denny_Yang/p/16827797.html
		https://blog.csdn.net/hjue/article/details/90442859

4. 有很多方法引入了搜狐的、腾讯的javascript链接，我试过了都不管用，搜狐一直403 forbidden