版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/bootstrap-multiselect/2.0.0/css/bootstrap-multiselect.css
- https://cdn.bootcdn.net/ajax/libs/bootstrap-multiselect/2.0.0/css/bootstrap-multiselect.min.css
- https://cdn.bootcdn.net/ajax/libs/bootstrap-multiselect/2.0.0/js/bootstrap-multiselect.js
- https://cdn.bootcdn.net/ajax/libs/bootstrap-multiselect/2.0.0/js/bootstrap-multiselect.min.js