如何在JS - Firefox中获取IP地址

var pc = new RTCPeerConnection();
pc.createDataChannel("");
pc.createOffer().then(function(offer) {
  var regex = /(?:^|\r|\n)candidate:.+?(\S+)(?=$|\r|\n)/g;
  var match = regex.exec(offer.sdp);
  while (match !== null) {
    if (match[1].indexOf("typ host") !== -1) {
      console.log("IP地址: " + match[1]);
    }
    match = regex.exec(offer.sdp);
  }
  pc.setLocalDescription(offer);
});

var xhr = new XMLHttpRequest();
xhr.open("GET", "https://api.ipify.org/?format=json", true);
xhr.onreadystatechange = function() {
  if (xhr.readyState === 4 && xhr.status === 200) {
    var response = JSON.parse(xhr.responseText);
    console.log("IP地址: " + response.ip);
  }
};
xhr.send();

fetch("https://api.ipify.org/?format=json")
  .then(response => response.json())
  .then(data => {
    console.log("IP地址: " + data.ip);
  });