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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（至少 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。
该我的项目反哺 GoogleChromeLabs/jsbi 作出了不凡奉献。
我的项目地址：
https://github.com/Leslie-Wong-H/jsbi-calculator装置
> 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>留神
上面表格中的运算操作是有波及到的。请留神，正数须要以 - 结尾且须要用括号括起来，例如 (-11), 负数不能以+ 号结尾。
| 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
我的项目开发失去了下列资源的灵感启发。
GoogleChromeLabs/jsbi
trincot’s answer to BigDecimal in JavaScript
LeetCode150 – Evaluate Reverse Polish Notation
Parsing math expressions with JavaScript – FreeCodeCamp
天穹之下
正文完
发表至： javascript
2023-04-27
