How to check what version of jQuery is loaded?

Question

How do I check which version of jQuery is loaded on the client machine? The client may have jQuery loaded but I don't know how to check it. If they have it loaded how do I check the version and the prefix such as:

$('.class') JQuery('.class') 

Answer 1

if (typeof jQuery != 'undefined') {       // jQuery is loaded => print the version     alert(jQuery.fn.jquery); }