【開源三方庫】bignumber.js：一個(gè)大數(shù)數(shù)學(xué)庫

ohpminstallbignumber.js

import BigNumber from "bignumber.js";

let x = new BigNumber(123.4567);let y = BigNumber('123456.7e-3');let z = new BigNumber(x);expect(x).assertEqual(y);expect(y).assertEqual(z);expect(x).assertEqual(z);

let x = new BigNumber('1111222233334444555566');x.toString();                       // "1.111222233334444555566e+21"x.toFixed();//"1111222233334444555566"

//使用超過15個(gè)有效數(shù)字的數(shù)字文字會導(dǎo)致精度損失。new BigNumber(1.0000000000000001)         // '1'new BigNumber(88259496234518.57)          // '88259496234518.56'new BigNumber(99999999999999999999)       // '100000000000000000000'//使用數(shù)值范圍之外的數(shù)字文字會導(dǎo)致精度損失。new BigNumber(2e+308)                     // 'Infinity'new BigNumber(1e-324)                     // '0'//Number值的算術(shù)運(yùn)算的意外結(jié)果導(dǎo)致精度損失。new BigNumber(0.7 +0.1)//'0.7999999999999999'

new BigNumber(Number.MAX_VALUE.toString(2), 2)

a = new BigNumber(1011, 2)          // "11"b = new BigNumber('zz.9', 36)       // "1295.25"c=a.plus(b)

0.3 - 0.1                           // 0.19999999999999998x = new BigNumber(0.3)x.minus(0.1)                        // "0.2"x//"0.3"

x.dividedBy(y).plus(z).times(9)x.times('1.23456780123456789e+9').plus(9876.5432321).dividedBy('4444562598.111772').integerValue()//"0.3"

x = new BigNumber(255.5)x.toExponential(5)                  // "2.55500e+2"x.toFixed(5)                        // "255.50000"x.toPrecision(5)                    // "255.50"x.toNumber()//255.5

x.toString(16)                     // "ff.8"

y = new BigNumber('1234567.898765')
y.toFormat(2)//"1,234,567.90"

y = new BigNumber(355)
pi = y.dividedBy(113)               // "3.1415929204"
pi.toFraction()                     // [ "7853982301", "2500000000" ]
pi.toFraction(1000)//["355","113"]

x = new BigNumber(NaN)                                           // "NaN"
y = new BigNumber(Infinity)                                      // "Infinity"
x.isNaN()&&!y.isNaN()&&!x.isFinite()&&!y.isFinite()

x = new BigNumber(-123.456);
x.c                                 // [ 123, 45600000000000 ]  coefficient (i.e. significand)
x.e                                 // 2                        exponent
x.s//-1sign

//為原始BigNumber構(gòu)造函數(shù)設(shè)置DECIMAL_LACES
BigNumber.set({ DECIMAL_PLACES: 10 })


// 創(chuàng)建另一個(gè)BigNumber構(gòu)造函數(shù)，可選地傳入配置對象
BN = BigNumber.clone({ DECIMAL_PLACES: 5 })


x = new BigNumber(1)
y = new BN(1)


x.div(3)                            // '0.3333333333'
y.div(3)//'0.33333'