Loading js asynchronously

[sivaganeshk]

Can I use the following to code to load many js files asynchronously?

<script type="text/javascript">
(function(){
  var ga = document.createElement('script');
     ga.type = 'text/javascript';
     ga.async = true;
     ga.src = '//mysite.com/ga.js';
  (document.getElementsByTagName('head')[0]||document.getElementsByTagName('body')[0]).appendChild(ga);
})();
</script>

Is it right?