获取用户IP的几种办法-白红宇

nginx + express 获取用户ip

nginx 配置

location / {    proxy_pass   http://127.0.0.1:3000;    proxy_redirect off;    proxy_set_header X-Real-IP $remote_addr;    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;    proxy_set_header Host $http_host;    proxy_set_header X-NginX-Proxy true;}复制代码

express 代码片段

var express = require('express')var app = express()app.get('/', function(req, res) {	// 获取ip	var ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress;	console.log(ip)	res.send(ip)})app.listen(3000, function() {	console.log('Server is running in 3000')})复制代码

demo 地址：

原生javascript获取用户ip

存在兼容性问题（不稳定）

function getUserIp(onNewIP) {    // campatibility for firefox and chrome    var myPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;    var pc = new myPeerConnection({            iceServers: []        }),        noop = function() {},        localIPs = {},        ipRegex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/g,        key;    function iterateIP(ip) {        if (!localIPs[ip]) onNewIP(ip);        localIPs[ip] = true;    }    // create a bogus data channel    pc.createDataChannel("");    // create offer and set local description    pc.createOffer().then(function(sdp) {        sdp.sdp.split('\n').forEach(function(line) {            if (line.indexOf('candidate') < 0) return;            line.match(ipRegex).forEach(iterateIP);        });        pc.setLocalDescription(sdp, noop, noop);    }).catch(function(reason) {        // An error occurred, so handle the failure to connect    });    // listen  for candidate events    pc.onicecandidate = function(ice) {        if (!ice || !ice.candidate || !ice.candidate.candidate || !ice.candidate.candidate.match(ipRegex)) return;        ice.candidate.candidate.match(ipRegex).forEach(iterateIP);    }}// ipgetUserIp(function(ip) {     console.log('ip', ip);});复制代码

第三方接口获取用户ip

function getIp() {  return new Promise((resolve, reject) => {    var script = document.createElement('script')    // script.src = 'https://jsonip.com/'    script.src = 'http://pv.sohu.com/cityjson?ie=utf-8'    script.onload = function() {      resolve(window.returnCitySN)    }    document.body.appendChild(script)  })}复制代码