数值类型插件 - 解决js精度问题bignumber.js

​​https://mikemcl.github.io/bignumber.js/​​​​​​

​​https://www.jianshu.com/p/f5d3e379744c​​​

​​​https://docs.ethers.io/v5/api/utils/bignumber/​​​​​​