How would one generate a MAC address in Javascript?

Question

I need to generate a random MAC address for a project of mine, and I can not get it to work. Below is my current code (that is not working).

function genMAC(){
/         


        

Answer 1

"XX:XX:XX:XX:XX:XX".replace(/X/g, function() {
  return "0123456789ABCDEF".charAt(Math.floor(Math.random() * 16))
});

jsfiddle http://jsfiddle.net/guest271314/qhbC9/