https://www.bigbasswood.ca/common/scripts/plugins/jquery.cachedScript.js

1
2// Extend jQuery with a cachedScript method
3(function($) {
4    var scriptCache = {};
5
6    $.cachedScript = function(url, options) {
7        // Allow user to set any option except for dataType, cache, and url
8        options = $.extend(options || {}, {
9            dataType: "script",
10            cache: true,
11            url: url
12        });
13
14        if (!scriptCache[url]) {
15            scriptCache[url] = $.ajax(options).done(function() {
16                //console.log('Loaded script:', url);
17            }).fail(function(jqxhr, settings, exception) {
18                //console.log('Failed to load script:', url);
19            });
20        }
21        return scriptCache[url];
22    };
23})(jQuery);