JavaScript获取本机IP地址三种常用方式

<code>
fetch('https://api.ipify.org?format=json')
.then(response => response.json())
.then(json => console.log(json.ip));
</code>

<code>
var myPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
var pc = new myPeerConnection({iceServers:[]}), noop = function(){}; 
var localIPs = {};
pc.createDataChannel("");
pc.createOffer().then(function (sdp) {
sdp.sdp.split('\n').forEach(function (line) { 
if (line.indexOf('candidate') < 0) return;
line.match(ipRegex).forEach(function (ip) {
localIPs[ip] = true;
});
});
pc.setLocalDescription(sdp, noop, noop);
}).catch(function (reason) {
console.log(reason);
});
var ipRegex = /([0-9]{1,3}(\.[0-9]{1,3}){3})/;
var ips = Object.keys(localIPs);
console.log(ips[0]);
</code>

<code>
var request = new XMLHttpRequest();
request.open('GET', 'https://api.ipify.org?format=json', true);
request.onload = function () {
if (request.status >= 200 && request.status < 400) {
var data = JSON.parse(request.responseText);
console.log(data.ip);
}
};
request.onerror = function () {
console.error('Error occurred during the network request');
};
request.send();
</code>