https://skisystem.it/theme/www/modules/require/require.js

1var Require = {
2    items: [],
3
4    include: function(items, callback) {
5        for(var i in items) {
6            this.items.push(items[i]);
7        }
8
9        if(this.items.length > 0) {
10            this.include_next(this.items, 0, callback);
11        }
12    },
13
14    include_next: function(items, i, callback) {
15        if(items[i]) {
16            var scriptTag = document.createElement('script');
17            scriptTag.src = items[i];
18    
19            i++;
20    
21            scriptTag.onload = this.include_next(items, i, callback);
22            scriptTag.onreadystatechange = this.include_next(items, i, callback);
23    
24            document.body.appendChild(scriptTag);
25        }
26        else {
27            if(typeof callback === "function") {
28                callback();
29            }
30        }
31    }
32}