nodejs从requset中获取ip

getIp.js

function getIp(req) {
    var ipAddress;
    var headers = req.headers;
    var forwardedIpsStr = headers['x-real-ip'] || headers['x-forwarded-for'];
    ipAddress = forwardedIpsStr ? forwardedIpsStr : '';
    if (!ipAddress) {
        ipAddress = req.connection.remoteAddress;
    }
    if (ipAddress.indexOf(':') !== -1) {
        ipAddress = ipAddress.split(':')[0];
    }
    return ipAddress;
}