版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/snarl/0.3.4/snarl.css
- https://cdn.bootcdn.net/ajax/libs/snarl/0.3.4/snarl.js
- https://cdn.bootcdn.net/ajax/libs/snarl/0.3.4/snarl.min.css
- https://cdn.bootcdn.net/ajax/libs/snarl/0.3.4/snarl.min.js