js 高精度运算

使用 decimal.js 这个库，避免报错 "9999998990000000 is beyond boundary when transfer to integer, the results may not be accurate"

• 错误

const NP = require("number-precision")
console.log(`结果`, String(NP.times(9999999, 9999999.99))) // "99999989900000"

• 正确

const decimalJs = require("decimal.js")
const x = new decimalJs('9999999')
const res = x.times('9999999.99').toString()
console.log(`res`, res) // "99999989900000.01"