Alternative to Alternative to document.write()

I need the below code to run by Alternative to document.write();

<script type='text/javaScript'>
  document.write(&quot;&lt;script src=\&quot;/feeds/posts/default?max-results=&quot;+portfolio_numposts+&quot;&amp;orderby=published&amp;alt=json-in-script&amp;callback=portfolioposts\&quot;&gt;&lt;\/script&gt;&quot;);
</script>