express获取用户ip地址

function getClientIp(req) {
    // 优先从 X-Forwarded-For 获取（代理/负载均衡器常用）
    const xForwardedFor = req.headers['x-forwarded-for'];
    if (xForwardedFor) {
        return xForwardedFor.split(',')[0].trim();
    }

    // 其次从 req.connection.remoteAddress 获取
    if (req.connection && req.connection.remoteAddress) {
        return req.connection.remoteAddress;
    }

    // 最后从 req.socket.remoteAddress 获取
    if (req.socket && req.socket.remoteAddress) {
        return req.socket.remoteAddress;
    }

    return 'unknown';
}

const ip = getClientIp(req)

直接把express自带的req传入进去就行