版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/jquery.hashcash.io/0.0.2/jquery.hashcash.io.css
- https://cdn.bootcdn.net/ajax/libs/jquery.hashcash.io/0.0.2/jquery.hashcash.io.js
- https://cdn.bootcdn.net/ajax/libs/jquery.hashcash.io/0.0.2/jquery.hashcash.io.min.css
- https://cdn.bootcdn.net/ajax/libs/jquery.hashcash.io/0.0.2/jquery.hashcash.io.min.js