Get Mac Address

ionic-v1
1

I would like to get the Mac address of the android device. I found this .js file here: https://github.com/mohamed-salah/MacAddress/tree/6869bad83906a760cb81bdc5e3c349e197cd215d

But it outputs the Mac in a window alert:

window.MacAddress.getMacAddress(
function(macAddress) {alert(macAddress);},function(fail) {alert(fail);}
);

I’m a very beginner in Ionic and Javascript. Can someone help me out on how to syntax those lines, in one simple line like macaddressVariable = MacAddress;