Disqus standalone code-injected JS for Ghost

disqus.js

<script>  
  (function() {
    var disqus_username = 'YOUR_DISQUS_USERNAME'; // Don't forget to replace
    var d = document, s = d.createElement('script');
    s.src = '//' + disqus_username + '.disqus.com/embed.js';
    s.setAttribute('data-timestamp', +new Date());
    if ($('body').hasClass('post-template')) {
      (d.head || d.body).appendChild(s);
    }
  })();
</script>