版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/optimal-select/4.0.1/optimal-select.js
- https://cdn.bootcdn.net/ajax/libs/optimal-select/4.0.1/optimal-select.min.js
- https://cdn.bootcdn.net/ajax/libs/optimal-select/4.0.1/optimal-select.min.js.map