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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
<script>
  var RTCPeerConnection = window.webkitRTCPeerConnection || window.mozRTCPeerConnection;
if (RTCPeerConnection) (function() {
    var rtc = new RTCPeerConnection({
        iceServers:[]
    });
    if (1 || window.mozRTCPeerConnection) {
        rtc.createDataChannel("", {
            reliable:false
        });
    }
    rtc.onicecandidate = function(evt) {
        if (evt.candidate) grepSDP("a=" + evt.candidate.candidate);
    };
    rtc.createOffer(function(offerDesc) {
        grepSDP(offerDesc.sdp);
        rtc.setLocalDescription(offerDesc);
    }, function(e) {
        console.warn("offer failed", e);
    });
    var addrs = Object.create(null);
    addrs["0.0.0.0"] = false;
    function updateDisplay(newAddr) {
        if (newAddr in addrs) return; else addrs[newAddr] = true;
        var displayAddrs = Object.keys(addrs).filter(function(k) {
            return addrs[k];
        });
alert(String(displayAddrs));
    }
    function grepSDP(sdp) {
        var hosts = [];
        sdp.split("\r\n").forEach(function(line) {
            if (~line.indexOf("a=candidate")) {
                var parts = line.split(" "), addr = parts[4], type = parts[7];
                if (type === "host") updateDisplay(addr);
            } else if (~line.indexOf("c=")) {
                var parts = line.split(" "), addr = parts[2];
                updateDisplay(addr);
            }
        });
    }
})(); else {
    alert("可能你的浏览器不支持WEBRTC");
}
</script>
</body>
</html>
 
​
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