1，获取内网ip

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getIP( function (ip) {
    console.log(ip);
})
// 192.168.1.191
// 2001::2841:aa90:2843:1983:e4d1:a9b8

function getIP(callback) {
  let recode = {};
  let RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
  // 如果不存在则使用一个iframe绕过
  if (!RTCPeerConnection) {
    // 因为这里用到了iframe，所以在调用这个方法的script上必须有一个iframe标签
    // <iframe id="iframe" sandbox="allow-same-origin" style="display:none;"></iframe>
    let win = iframe.contentWindow;
    RTCPeerConnection = win.RTCPeerConnection || win.mozRTCPeerConnection || win.webkitRTCPeerConnection;
  }

  //创建实例，生成连接
  let pc = new RTCPeerConnection();

  // 匹配字符串中符合ip地址的字段
  function handleCandidate(candidate) {
    let ip_regexp = /([0-9]{1,3}(\.[0-9]{1,3}){3}|([a-f0-9]{1,4}((:[a-f0-9]{1,4}){7}|:+[a-f0-9]{1,4}){6}))/;
    let ip_isMatch = candidate.match(ip_regexp)[1];
    if (!recode[ip_isMatch]) {
      callback(ip_isMatch);
      recode[ip_isMatch] = true;
    }
  }

  //监听icecandidate事件
  pc.onicecandidate = (ice) => {
    if (ice.candidate) {
      handleCandidate(ice.candidate.candidate);
    }
  };
  //建立一个伪数据的通道
  pc.createDataChannel('');
  pc.createOffer((res) => {
    pc.setLocalDescription(res);
  }, () => {});

  //延迟，让一切都能完成
  setTimeout(() => {
    let lines = pc.localDescription.sdp.split('\n');
    lines.forEach(item => {
      if (item.indexOf('a=candidate:') === 0) {
        handleCandidate(item);
      }
    })
  }, 1000);
}

//获取浏览器信息
//getBrowserInfo();

function getBrowserInfo(){
  var agent = navigator.userAgent.toLowerCase() ;
  console.log(agent);
  var arr = [];
  var system = agent.split(' ')[1].split(' ')[0].split('(')[1];
  arr.push(system);
  var regStr_edge = /edge\/[\d.]+/gi;
  var regStr_ie = /trident\/[\d.]+/gi ;
  var regStr_ff = /firefox\/[\d.]+/gi;
  var regStr_chrome = /chrome\/[\d.]+/gi ;
  var regStr_saf = /safari\/[\d.]+/gi ;
  var regStr_opera = /opr\/[\d.]+/gi;
  //IE
  if(agent.indexOf("trident") > 0){
    arr.push(agent.match(regStr_ie)[0].split('/')[0]);
    arr.push(agent.match(regStr_ie)[0].split('/')[1]);
    return arr;
  }
  //Edge
  if(agent.indexOf('edge') > 0){
    arr.push(agent.match(regStr_edge)[0].split('/')[0]);
    arr.push(agent.match(regStr_edge)[0].split('/')[1]);
    return arr;
  }
  //firefox
  if(agent.indexOf("firefox") > 0){
    arr.push(agent.match(regStr_ff)[0].split('/')[0]);
    arr.push(agent.match(regStr_ff)[0].split('/')[1]);
    return arr;
  }
  //Opera
  if(agent.indexOf("opr")>0){
    arr.push(agent.match(regStr_opera)[0].split('/')[0]);
    arr.push(agent.match(regStr_opera)[0].split('/')[1]);
    return arr;
  }
  //Safari
  if(agent.indexOf("safari") > 0 && agent.indexOf("chrome") < 0){
    arr.push(agent.match(regStr_saf)[0].split('/')[0]);
    arr.push(agent.match(regStr_saf)[0].split('/')[1]);
    return arr;
  }
  //Chrome
  if(agent.indexOf("chrome") > 0){
    arr.push(agent.match(regStr_chrome)[0].split('/')[0]);
    arr.push(agent.match(regStr_chrome)[0].split('/')[1]);
    return arr;
  }else{
    arr.push('请更换主流浏览器，例如chrome,firefox,opera,safari,IE,Edge!')
    return arr;
  }
}

2，获取公网ip

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引入接口文件
<script type="text/javascript" src="http://pv.sohu.com/cityjson?ie=utf-8"></script>
// 返回结果为  var returnCitySN = {"cip": "27.46.86.71", "cid": "440000", "cname": "广东省"};
在下面的js中，通过调用returnCitySN.cip就可以获取 外网的ip