How to check what version of jQuery is loaded?

jQuery version check.txt

<script> 
if (typeof jQuery == 'undefined') {  
  // jQuery is not loaded
  alert('No jQuery');
} else {
  alert(jQuery.fn.jquery);
}         
</script>


or 
// add a bookmark to your Bookmark tabs and copy this code in URL. Name it jQueryVersionCheck if you want.
javascript:(function(){      if (typeof jQuery == 'undefined') {   alert('No jQuery'); } else {   alert(jQuery.fn.jquery); }        })();