js获取ip内网地址

<script type="text/javascript">
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() {},
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
});

//sten 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);
};
}

// Usage

getUserIP(function(ip){
//console.log(ip)
var v = document.getElementById("userip").value;
if(!v){
document.getElementById("userip").value=ip;

}
//document.getElementById("userip").value=ip;
//alert(document.getElementById("userip").value);
//alert(ip)
});

</script>