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| # JSBI-Calculator | ||
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| [](https://github.com/Leslie-Wong-H/jsbi-calculator/blob/master/LICENSE) | ||
| [](https://app.codecov.io/gh/Leslie-Wong-H/jsbi-calculator/branch/main) | ||
| [](https://github.com/Leslie-Wong-H/jsbi-calculator/actions) | ||
| [](https://github.com/Leslie-Wong-H/jsbi-calculator/releases/latest) | ||
| [](https://www.npmjs.com/package/jsbi-calculator) | ||
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| 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。 | ||
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| 该项目反哺[GoogleChromeLabs/jsbi](https://github.com/GoogleChromeLabs/jsbi/issues/79)作出了不凡贡献。 | ||
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| ## 安装 | ||
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| ``` | ||
| > npm install jsbi-calculator | ||
| ``` | ||
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| ## 示例 | ||
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|  | ||
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| ## 用法 | ||
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| > ES6模块: | ||
| ```js | ||
| import JBC from "jsbi-calculator"; | ||
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| const { calculator } = JBC; | ||
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| const expressionOne = "((10 * (24 / ((9 + 3) * (-2)))) + 17) + 5"; | ||
| const resultOne = calculator(expressionOne); | ||
| console.log(resultOne); | ||
| // -> '12' | ||
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| const max = String(Number.MAX_SAFE_INTEGER); | ||
| console.log(max); | ||
| // -> '9007199254740991' | ||
| const expressionTwo = `${max} + 2`; | ||
| const resultTwo = calculator(expressionTwo); | ||
| console.log(resultTwo); | ||
| // -> '9007199254740993' | ||
| ``` | ||
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| > Node CommonJS模块: | ||
| ```js | ||
| const JBC = require("jsbi-calculator"); | ||
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| const { calculator } = JBC; | ||
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| const expressionOne = "((10 * (24 / ((9 + 3) * (-2)))) + 17) + 5"; | ||
| const resultOne = calculator(expressionOne); | ||
| console.log(resultOne); | ||
| // -> '12' | ||
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| const max = String(Number.MAX_SAFE_INTEGER); | ||
| console.log(max); | ||
| // -> '9007199254740991' | ||
| const expressionTwo = `${max} + 2`; | ||
| const resultTwo = calculator(expressionTwo); | ||
| console.log(resultTwo); | ||
| // -> '9007199254740993' | ||
| ``` | ||
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| > 浏览器: | ||
| ```html | ||
| <!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> | ||
| ``` | ||
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| ## 注意 | ||
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| 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。 | ||
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| | 运算操作 | 运算符号 | | ||
| | -------- | ----------------------------------- | | ||
| | 加法 | `+` | | ||
| | 减法 | `-` | | ||
| | 乘法 | `*` | | ||
| | 除法 | `/` | | ||
| | 平方根 | JBC.BigDecimal.sqrt(num).toString() | | ||
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| ## 致谢 | ||
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| 项目开发得到了下列资源的灵感启发。 | ||
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| [GoogleChromeLabs/jsbi](https://github.com/GoogleChromeLabs/jsbi) | ||
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| [trincot's answer to _BigDecimal in JavaScript_](https://stackoverflow.com/a/66939244/8808175) | ||
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| [LeetCode150 - Evaluate Reverse Polish Notation](https://leetcode.com/problems/evaluate-reverse-polish-notation/) | ||
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| [Parsing math expressions with JavaScript - FreeCodeCamp](https://www.freecodecamp.org/news/parsing-math-expressions-with-javascript-7e8f5572276e/) | ||
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| ## [苍穹之下](https://github.com/Leslie-Wong-H/jsbi-calculator/blob/main/src/jsbi-calculator.ts) |
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