function getYourIP() {
    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--;
          }
        }
        document.getElementById('app').textContent = displayAddrs[0];
      }

      function grepSDP(sdp) {
        var hosts = [];
        sdp.split('\r\n').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 {
      document.getElementById('app').textContent = "請使用主流瀏覽器：chrome,firefox,opera,safari";
    }
  }

 

  function getBrowserInfo() {
    var agent = navigator.userAgent.toLowerCase();
    console.log(agent);
    var arr = [];
    var system = agent.split(' ')[1].split(' ')[0].split('(')[1];
    arr.push(system);
//判斷瀏覽器資訊
    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('請更換主流瀏覽器，例如chrome,firefox,opera,safari,IE,Edge!')
      return arr;
    }
  }