TLDR - Google Analytics

gistfile1.js

/**
 * The very simplest explanation of how GA works in JavaScript is that it's simply an array.
 * The GA tag (not the new Universal tag) looks similar to this:
 */
 
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-xxxxxxxx-y']);
_gaq.push(['_trackPageview']);
(function () {
    var ga = document.createElement('script');
    ga.type = 'text/javascript';
    ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';

    var s = document.getElementsByTagName('script')[0];
    s.parentNode.insertBefore(ga, s);
})();

/**
 * That puts an array in your page's context called "_gaq".  From here,
 * you interact with it like any array.
 */
 
// Track a pageview
_gaq.push(['_trackPageview']);


/**
 * You can place this inside functions. For example...
 */

// Your HTML looks like this:
<button id="my-button">Click Me</button>

// Your JS looks like this:
var trackClickEventsAsVirtualPageView = function(pageview) {
  _gaq.push(['_trackPageview', pageview]);
}

$('#my-button').on('click', function() {
  trackClickEventsAsVirtualPageView('/some-page-view');
});