• math.js
• BigNumber.js
• decimal.js
• big.js

math.js

<script src="https://cdn.bootcdn.net/ajax/libs/mathjs/9.4.4/math.min.js"></script>

// functions and constants
math.round(math.e, 3)                // 2.718
math.atan2(3, -3) / math.pi          // 0.75
math.log(10000, 10)                  // 4
math.sqrt(-4)                        // 2i
math.pow([[-1, 2], [3, 1]], 2)       // [[7, 0], [0, 7]]

// expressions
math.evaluate('12 / (2.3 + 0.7)')    // 4
math.evaluate('12.7 cm to inch')     // 5 inch
math.evaluate('sin(45 deg) ^ 2')     // 0.5
math.evaluate('9 / 3 + 2i')          // 3 + 2i
math.evaluate('det([-1, 2; 3, 1])')  // -7

// chained operations
math.chain(3)
    .add(4) // 加
    .multiply(2) // 乘
    .done() // 14
    
function funAdd(a,b){
         math.config({
            number: 'BigNumber'
        });
        return math.parser().eval(a + "+" + b);
}

参考文章 ：math.js：灵活强大的JavaScript数学库 - 简书 (jianshu.com) (opens new window)

BigNumber.js

<script src="https://cdn.bootcdn.net/ajax/libs/bignumber.js/9.0.1/bignumber.min.js"></script>

参考： JS中调用bignumber处理高精度小数运算 - 先锋之客 - 博客园 (cnblogs.com) (opens new window)

bignumber.js API (mikemcl.github.io) (opens new window)

decimal.js

big.js

<script src="https://cdn.bootcdn.net/ajax/libs/big.js/6.1.1/big.min.js"></script>

Big(record.count).times(record.price).plus(result).minus(100); // 乘、加、减、除div

big.js API (mikemcl.github.io) (opens new window)