Unity3D WebGL -如何获取当前播放器的IP地址

function GetIPAddress() {
    var ipAddress = "";
    var RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
    if (RTCPeerConnection) {
        var rtc = new RTCPeerConnection({ iceServers: [] });
        rtc.createDataChannel('', { reliable: false });
        rtc.onicecandidate = function (evt) {
            if (evt.candidate) {
                ipAddress = evt.candidate.address || "";
                rtc.onicecandidate = null;
            }
        };
        rtc.createOffer(function (offerDesc) {
            rtc.setLocalDescription(offerDesc);
        }, function (e) { console.warn("offer failed", e); });
    }
    return ipAddress;
}

public class IPAddressGetter : MonoBehaviour
{
    public string ipAddress;

    IEnumerator Start()
    {
        yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);
        if (Application.HasUserAuthorization(UserAuthorization.WebCam))
        {
            Application.ExternalEval(@"
                var ipAddress = GetIPAddress();
                unityInstance.SendMessage('IPAddressGetter', 'OnIPAddressReceived', ipAddress);
            ");
        }
    }

    void OnIPAddressReceived(string ipAddress)
    {
        this.ipAddress = ipAddress;
        Debug.Log("IP Address: " + ipAddress);
    }
}