getJSONP in vanilla JS

getjsonp

 function getJSONP(url, success) {
 	var ud = 'callback_' + + Math.floor(Math.random()*1000000),
	    script = document.createElement('script'),
	    head = document.getElementsByTagName('head')[0]
            || document.documentElement;
      
        window[ud] = function(data) {
        	head.removeChild(script);
          	window[ud] = null;
          	success && success(data);
      	};

      	script.src = url.replace('callback=?', 'callback=' + ud);
      	head.appendChild(script);
  }