vip_load_scripts.js.php

<?php
use Glpi\Event;
header('Content-Type: text/javascript');

?>

var root_vip_doc = "<?php echo $CFG_GLPI['root_doc'] . '/plugins/vip'; ?>";
(function ($) {

    $.fn.vip_load_scripts = function () {

        init();
        // Start the plugin
        function init() {
            // Send data
            $.ajax({
                url: root_vip_doc +'/ajax/loadscripts.php',
                type: "POST",
                dataType: "html",
                data: 'action=load',
                success: function (response, opts) {
                    var scripts, scriptsFinder = /<script[^>]*>([\s\S]+?)<\/script>/gi;
                    while (scripts = scriptsFinder.exec(response)) {
                        eval(scripts[1]);
                    }
                }
            });
        }

        return this;
    };
}(jQuery));

$(document).vip_load_scripts();