(function() {

 var getEvent = function() {

    event = window.ondeviceorientation ? "deviceorientation" :  "resize";

    return event;

 };

  console.log(getEvent());

 document.addEventListener(getEvent(), function() { 

  console.log("Size changed");

 }, false);

function callable(){};

document.addEventListener("deviceorientation",callable);

document.addEventListener("resize",callable);

})();