Implement live chat only using js code

Live chat js Impmlementation

<script type="text/javascript">
  var __lc = {};
  __lc.license = 4845221;
  
  (function() {
  	var lc = document.createElement('script'); lc.type = 'text/javascript'; lc.async = true;
  	lc.src = ('https:' == document.location.protocol ? 'https://' : 'http://') + 'cdn.livechatinc.com/tracking.js';
  	var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(lc, s);
  })();
</script>