JSBI-CalculatorIE11 兼容的高精度四则运算 JS 库组件-技术圈

JSBI-Calculator是一个IE11兼容的计算器JS库组件，用于实现高精度（至多18位小数）大数值四则运算，基于由谷歌Chrome实验室出品的JSBI封装的BigDecimal。

该项目反哺GoogleChromeLabs/jsbi作出了不凡贡献。

安装

> npm install jsbi-calculator

示例

用法

ES6模块:

import JBC from "jsbi-calculator";



const { calculator } = JBC;



const expressionOne = "((10 * (24 / ((9 + 3) * (-2)))) + 17) + 5";

const resultOne = calculator(expressionOne);

console.log(resultOne);

// -> '12'



const max = String(Number.MAX_SAFE_INTEGER);

console.log(max);

// -> '9007199254740991'

const expressionTwo = `${max} + 2`;

const resultTwo = calculator(expressionTwo);

console.log(resultTwo);

// -> '9007199254740993'

Node CommonJS模块:

const JBC = require("jsbi-calculator");



const { calculator } = JBC;



const expressionOne = "((10 * (24 / ((9 + 3) * (-2)))) + 17) + 5";

const resultOne = calculator(expressionOne);

console.log(resultOne);

// -> '12'



const max = String(Number.MAX_SAFE_INTEGER);

console.log(max);

// -> '9007199254740991'

const expressionTwo = `${max} + 2`;

const resultTwo = calculator(expressionTwo);

console.log(resultTwo);

// -> '9007199254740993'

浏览器:

<!DOCTYPE html>

<html lang="en">

  <head>

    <meta charset="UTF-8" />

    <meta http-equiv="X-UA-Compatible" content="IE=edge" />

    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <title>Jsbi-calculator Test</title>

    <script src="https://cdn.jsdelivr.net/npm/jsbi-calculator/dist/jsbi-calculator-umd.js"></script>

  </head>

  <body></body>

  <script type="text/javascript">

    const expressionOne = "((10 * (24 / ((9 + 3) * (-2)))) + 17) + 5";

    const resultOne = JBC.calculator(expressionOne);

    console.log(resultOne);

    // -> '12'



    const userAgent = navigator.userAgent;

    const isIE11 =

      userAgent.indexOf("Trident") > -1 && userAgent.indexOf("rv:11.0") > -1;

    let max;

    // MAX_SAFE_INTEGER not available in IE11

    max = isIE11 ? "9007199254740991" : String(Number.MAX_SAFE_INTEGER);



    console.log(max);

    // -> '9007199254740991'

    const expressionTwo = max + " + 2";

    const resultTwo = JBC.calculator(expressionTwo);

    console.log(resultTwo);

    // -> '9007199254740993'

  </script>

</html>