版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/angular-multi-select/4.0.0/isteven-multi-select.css
- https://cdn.bootcdn.net/ajax/libs/angular-multi-select/4.0.0/isteven-multi-select.js
- https://cdn.bootcdn.net/ajax/libs/angular-multi-select/4.0.0/isteven-multi-select.min.css
- https://cdn.bootcdn.net/ajax/libs/angular-multi-select/4.0.0/isteven-multi-select.min.js