版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/getmdl-select/2.0.1/getmdl-select.min.css
- https://cdn.bootcdn.net/ajax/libs/getmdl-select/2.0.1/getmdl-select.min.css.map
- https://cdn.bootcdn.net/ajax/libs/getmdl-select/2.0.1/getmdl-select.min.js
- https://cdn.bootcdn.net/ajax/libs/getmdl-select/2.0.1/getmdl-select.min.js.map