js 获取客户端ip地址

function getLocalIPs(callback) {
    const RTCPeerConnection = window.RTCPeerConnection || window.webkitRTCPeerConnection || window.mozRTCPeerConnection;
    const ips = {};

    if (!RTCPeerConnection) {
        callback(ips);
        return;
    }

    const rtc = new RTCPeerConnection({ iceServers: [] });
    rtc.createDataChannel('', { reliable: false });

    rtc.onicecandidate = function (ice) {
        if (ice.candidate) {
            const ipMatch = /([0-9]{1,3}(\.[0-9]{1,3}){3})/.exec(ice.candidate.candidate);
            if (ipMatch) {
                const ip = ipMatch[1];
                ips[ip] = true;
                callback(ips);
            }
        }
    };

    rtc.createOffer().then(offer => rtc.setLocalDescription(offer));
}

getLocalIPs(function (ips) {
    console.log('Local IPs:', Object.keys(ips));
});

fetch('https://api.ipify.org?format=json')
    .then(response => response.json())
    .then(data => console.log('Public IP:', data.ip));

app.get('/', (req, res) => {
    const clientIp = req.headers['x-forwarded-for'] || req.connection.remoteAddress;
    res.send(`<script>console.log('Client IP from server:', "${clientIp}");</script>`);
});