版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/gif.js/0.2.0/gif.js
- https://cdn.bootcdn.net/ajax/libs/gif.js/0.2.0/gif.js.map
- https://cdn.bootcdn.net/ajax/libs/gif.js/0.2.0/gif.worker.js
- https://cdn.bootcdn.net/ajax/libs/gif.js/0.2.0/gif.worker.js.map