因為涉及相容性問題，可以透過req.header("x-forwarded-for")與req.connection.remoteAddress來獲取IP地址，下面是封裝好的一個函式：

因為涉及相容性問題，可以透過req.header("x-forwarded-for")與req.connection.remoteAddress來獲取IP地址，下面是封裝好的一個函式：

function getClientIp(req) {

var ipAddress;

var forwardedIpsStr = req.header("x-forwarded-for");

if (forwardedIpsStr) {

var forwardedIps = forwardedIpsStr.split(",");

ipAddress = forwardedIps[0];

}

if (!ipAddress) {

ipAddress = req.connection.remoteAddress;

}

return ipAddress;

};