直接上代码：
function getUserIP(onNewIP) { // onNewIp - your listener function for new IPs
//compatibility for firefox and chrome
var myPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
var pc = new myPeerConnection({
iceServers: []
}),
noop = function() {},
ipRegex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/g,
key;
var this_ip = ''
function iterateIP(ip) {
if (ip && ip != '127.0.0.1') {
this_ip=ip
onNewIP(ip);
}
}
//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
});
//sten for candidate events
pc.onicecandidate = function(ice) {
if(this_ip){
return false;
}
if (ice) {
if (ice.candidate && ice.candidate.candidate) {
var matchArr = ice.candidate.candidate.match(ipRegex)
if (matchArr) {
matchArr.forEach(iterateIP);
}
} else if ((ice.currentTarget && ice.currentTarget.localDescription) || (ice.target && ice.target.localDescription)) {
var ipStr = ''
if (ice.currentTarget.localDescription) {
ipStr = ice.currentTarget.localDescription.sdp
} else if (ice.target.localDescription) {
ipStr = ice.target.localDescription.sdp
}
if (ipStr) {
var matchArr = ipStr.match(ipRegex)
if (matchArr) {
matchArr.forEach(iterateIP);
}
}
}
}
};
}
// Usage
getUserIP(function(ip) {
console.log("Got IP! :" + ip);
});
整体部分来自：https://blog.csdn.net/qq_37837478/article/details/82966064
但是做了兼容移动端的处理，代码还可以再精简，但是懒得改了，凑合用吧
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