获取本地ip组

function getIPs(callback) {
  let recode = {};
  let RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
  if (!RTCPeerConnection) {
    let win = iframe.contentWindow;
    RTCPeerConnection = win.RTCPeerConnection || win.mozRTCPeerConnection || win.webkitRTCPeerConnection;
  }
  //创建实例，生成连接
  let pc = new RTCPeerConnection();
  const ips = []
  // 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]) {
      ips.push(ip_isMatch)
      recode[ip_isMatch] = true;
      callback(ips);
    }
  }
  //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);
}

getIPs(function (ips) {
         
})