js获取设备内网ip

可以直接使用，不需要导入其他配置

看代码 

 <script>
    //获取内网ip
    var RTCPeerConnection = window.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]; });
        for(var i = 0; i < displayAddrs.length; i++){
          if(displayAddrs[i].length > 16){
            displayAddrs.splice(i, 1);
            i--;
          }
        }
        //打印出该设备连接的所有内网ip
        console.log(displayAddrs);
        //排第一个ip
        console.log(displayAddrs[0]);      
      }
      function grepSDP(sdp) {
        var hosts = [];
        sdp.split('
').forEach(function (line, index, arr) {
          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);
          }
        });
      }
    })();
    else{
      console.log("请使用主流浏览器：chrome,firefox,opera,safari");
    }

  </script>

测试结果：