Add jQuery to a webpage using google console programmatically

addjquery.js

var loadjQuery = function(cb){
   if(typeof(jQuery) == 'undefined'){
     var scr = document.createElement('script');
     scr.setAttribute('type', 'text/javascript');
     scr.setAttribute('src', 'https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js');

     if(scr.readyState){
        scr.onreadystatechange = function(){
            if(scr.readyState === 'complete' || scr.readyState === 'loaded'){
               scr.onreadystatechange = null;
               if(cb === 'function'){
                  args = [].slice.call(arguments, 1);
                  cb.apply(this, args);
               }
            }
        };
     }
     else {
        scr.onload = function(){
           if(cb === 'function'){
              args = [].slice.call(arguments, 1);
              cb.apply(this, args);
           }
        };
     }

     var head = document.getElementsByTagName('head')[0];
     head.insertBefore(scr, head.firstChild);  
   }
}