gistfile1.txt

(function($){

    window.App = {
        
        // Site wide options        
        opts = {
            rootURL: '/'   
        };
       
        // Pass in any options to 'o' and merge it with global defaults
        init: function(o){
             this.opts = $.extend({}, this.opts, o);
        }
    
    }

})(jQuery);

<script type="text/javascript">
    App.init({
        rootURL: '<?= $your_siteurl ?>'
    });
</script>