众所周知 js  0.1+0.2 != 0.3 ,概因进制转换造成的精度缺失  

1. 插件安装 

npm i big.js

2. 代码示例

import Big from "big.js";

const a = new Big("0.1");
const b = new Big("0.2");
const c = new Big("0.3");

// 加法
const sum = a.plus(b);
console.log("Sum:", sum.toString()); // 输出 "0.3"

// 减法
const difference = c.minus(a);
console.log("Difference:", difference.toString()); // 输出 "0.2"

// 乘法
const product = a.times(b);
console.log("Product:", product.toString()); // 输出 "0.02"

// 除法
const quotient = a.div(b);
console.log("Quotient:", quotient.toString()); // 输出 "0.5"