版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/fotorama/4.6.4/fotorama.css
- https://cdn.bootcdn.net/ajax/libs/fotorama/4.6.4/fotorama.js
- https://cdn.bootcdn.net/ajax/libs/fotorama/4.6.4/fotorama.min.css
- https://cdn.bootcdn.net/ajax/libs/fotorama/4.6.4/fotorama.min.js
- https://cdn.bootcdn.net/ajax/libs/fotorama/4.6.4/fotorama.png
- https://cdn.bootcdn.net/ajax/libs/fotorama/4.6.4/fotorama@2x.png