js 如何获取访问者ip

fetch('https://api.ipify.org?format=json')
  .then(response => response.json())
  .then(data => {
    console.log('Your IP address is:', data.ip);
  })
  .catch(error => {
    console.error('Error fetching IP:', error);
  });

const express = require('express');
const app = express();

app.get('/get-ip', (req, res) => {
  const ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress;
  res.json({ ip });
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

fetch('/get-ip')
  .then(response => response.json())
  .then(data => {
    console.log('Your IP address is:', data.ip);
  })
  .catch(error => {
    console.error('Error fetching IP:', error);
  });

function getLocalIPs(callback) {
  var ips = [];
  var RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
  var pc = new RTCPeerConnection({ iceServers: [] });

  pc.createDataChannel('');
  pc.onicecandidate = function(e) {
    if (!e.candidate) {
      pc.close();
      callback(ips);
      return;
    }
    var ip = /^candidate:.+ (\S+) \d+ typ/.exec(e.candidate.candidate)[1];
    if (ips.indexOf(ip) == -1) {
      ips.push(ip);
    }
  };
  pc.createOffer().then(function(sdp) {
    pc.setLocalDescription(sdp);
  }).catch(function(e) {
    console.error(e);
  });
}

getLocalIPs(function(ips) {
  console.log('Local IPs:', ips);
});