版本：0.9.1
- https://cdn.bootcdn.net/ajax/libs/Ladda/0.9.1/ladda-themeless.min.css
- https://cdn.bootcdn.net/ajax/libs/Ladda/0.9.1/ladda.min.css
- https://cdn.bootcdn.net/ajax/libs/Ladda/0.9.1/ladda.min.js
- https://cdn.bootcdn.net/ajax/libs/Ladda/0.9.1/spin.min.js