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calc-number

v0.2.4

Published

js 在数字计算的时候,存在"浮点数精度丢失"问题。

Readme

解决js数字计算精度问题

js 在数字计算的时候,存在"浮点数精度丢失"问题。

比如:0.1+0.2 = 0.30000000000000004

在计算和金额计算等场景下,就会存在健壮问题。本npm包,通过最简单的一个api方式解决这个问题。

引入

npm i calc-number --save

使用

import calcNumber from 'calc-number'

const result = calcNumber('0.1+0.2')
console.log(result);// 输出0.3

说明

// 支持括号
calcNumber('(0.3+0.3)*3');// 1.8

// 连续运算会正确的计算优先级*/大于+-
calcNumber('1+2*3/2+2*4');// 12

// 支持**幂次方运算
calcNumber('3**2')// 9

运算优先级对齐js的数字计算

更多扩展能力

支持内置函数调用

sin,cos,tan,atan,

calcNumber('sin(1)');

后置处理

保留小数位 toFixed

calcNumber('(23.123*3).toFixed(2)');