版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/bootstrap-multiselect/1.1.2/css/bootstrap-multiselect.css
- https://cdn.bootcdn.net/ajax/libs/bootstrap-multiselect/1.1.2/css/bootstrap-multiselect.min.css
- https://cdn.bootcdn.net/ajax/libs/bootstrap-multiselect/1.1.2/js/bootstrap-multiselect.js
- https://cdn.bootcdn.net/ajax/libs/bootstrap-multiselect/1.1.2/js/bootstrap-multiselect.min.js