通过js获取本机的IP地址

不需要修改任何代码，直接运行就可以了

function getUserIP(onNewIP) { //  onNewIp - your listener function for new IPs
      //compatibility for firefox and chrome
      var myPeerConnection =  ||  || ;
      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
     ("");
 
     // create offer and set local description
     ().then(function(sdp) {
         ('\n').forEach(function(line) {
             if (('candidate') < 0) return;
             (ipRegex).forEach(iterateIP);
         });
         
         (sdp, noop, noop);
     }).catch(function(reason) {
         // An error occurred, so handle the failure to connect
     });
 
     //sten for candidate events
      = function(ice) {
         if (!ice || ! || ! || !(ipRegex)) return;
         (ipRegex).forEach(iterateIP);
     };
}
 
// Usage
 
getUserIP(function(ip){
     alert("Got IP! :" + ip);
});