JSBI-Calculator
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。
项目地址：
https://github.com/Leslie-Wong-H/jsbi-calculator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>注意
下面表格中的运算操作是有涉及到的。请注意，负数需要以-开头且需要用括号括起来，例如(-11),正数不能以+号开头。
| 运算操作 | 运算符号 |
|---|---|
| 加法 | + |
| 减法 | - |
| 乘法 | * |
| 除法 | / |
| 平方根 | JBC.BigDecimal.sqrt(num).toString() |
致谢
项目开发得到了下列资源的灵感启发。
trincot's answer to BigDecimal in JavaScript
LeetCode150 - Evaluate Reverse Polish Notation
Parsing math expressions with JavaScript - FreeCodeCamp
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