版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/jcalculator/1403955268/jcalculator.css
- https://cdn.bootcdn.net/ajax/libs/jcalculator/1403955268/jcalculator.js
- https://cdn.bootcdn.net/ajax/libs/jcalculator/1403955268/jcalculator.min.css
- https://cdn.bootcdn.net/ajax/libs/jcalculator/1403955268/jcalculator.min.js