Firefox 跟 Chrome支持WebRTC可以向STUN服务器请求，返回内外网IP，不同于XMLHttpRequest请求，STUN请求开发者工具当中看不到网络请求的。
//get the IP addresses associated with an account function getIPs(callback) { var ip_dups = {}; //compatibility for firefox and chrome var RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection; var mediaConstraints = { optional: [{RtpDataChannels: true}] }; //firefox already has a default stun server in about:config // media.peerconnection.default_iceservers = // [{"url": "stun:stun.services.mozilla.com"}] var servers = undefined; //add same stun server for chrome if(window.webkitRTCPeerConnection) servers = {iceServers: [{urls: "stun:stun.services.mozilla.com"}]}; //construct a new RTCPeerConnection var pc = new RTCPeerConnection(servers, mediaConstraints); //listen for candidate events pc.onicecandidate = function(ice){ //skip non-candidate events if(ice.candidate){ //match just the IP address var ip_regex = /([0-9]{1,3}(.[0-9]{1,3}){3})/ var ip_addr = ip_regex.exec(ice.candidate.candidate)[1]; //remove duplicates if(ip_dups[ip_addr] === undefined) callback(ip_addr); ip_dups[ip_addr] = true; } }; //create a bogus data channel pc.createDataChannel(""); //create an offer sdp pc.createOffer(function(result){ //trigger the stun server request pc.setLocalDescription(result, function(){}); }, function(){});} //Test: Print the IP addresses into the console getIPs(function(ip){console.log(ip);});
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