js Decimal

  GITHUB:  https://github.com/MikeMcl/decimal.js
  API:  http://mikemcl.github.io/decimal.js/
  NPM:  https://www.npmjs.com/package/decimal.js

var Decimal = require('decimal.js');

//加法
var a = 0.1;
var b = 0.2;
console.log('直接加法運算 a + b =', a + b);
console.log('Decimal.js加法運算 a + b =',  new Decimal(a).add(new Decimal(b)).toNumber());

//減法
var a = 1.0;
var b = 0.7
console.log('直接減法運算 a - b =', a - b);
console.log('Decimal.js減法運算 a - b =',  new Decimal(a).sub(new Decimal(b)).toNumber());

//乘法
var a = 1.01;
var b = 1.003;
console.log('直接乘法運算 a * b =', a * b);
console.log('Decimal.js乘法運算 a * b =',  new Decimal(a).mul(new Decimal(b)).toNumber());

//除法
var a = 0.029;
var b = 10;
console.log('直接除法運算 a / b =', a / b);
console.log('Decimal.js除法運算 a / b =',  new Decimal(a).div(new Decimal(b)).toNumber());