to get jQuery version info the variable jQuery.fn.jquery (or $.fn.jquery if $ is being used for jQuery object) can be used. Some examples.
jQuery version in code
<pre id="msg"></pre>
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<script type="text/javascript">
$("#msg").text("jQuery version: " + $.fn.jquery);
</script>jQuery version in Chrome console
To quickly get jQuery version on a site, Chrome console can be used. Just type the following:
jQuery.fn.jquery // or $.fn.jquery
The outcome will be something like this:
