版本：10.4.2
- https://cdn.bootcdn.net/ajax/libs/decimal.js/10.4.2/decimal.d.ts
- https://cdn.bootcdn.net/ajax/libs/decimal.js/10.4.2/decimal.js
- https://cdn.bootcdn.net/ajax/libs/decimal.js/10.4.2/decimal.min.js
An arbitrary-precision Decimal type for JavaScript.