獲取傳送AJAX請求的客戶端ip:

server = http.createServer(function(req, res) {
     var ip = req.headers['x-forwarded-for'] || req.ip || req.connection.remoteAddress || req.socket.remoteAddress || req.connection.socket.remoteAddress || '';
     if(ip.split(',').length>0){
        ip = ip.split(',')[0];
     }
})
 

獲取websocket連線的客戶端ip:

ws.on("connection" , function(wsocket) {
var ip=wsocket._socket.remoteAddress;
}）