JavaScript对象之数学函数运算-Math

JavaScript封装了自己的函数库，下面来看看最常用的数学运算函数，以及封装使用的math.js工具包。

Math基本属性和方法

MathJs

官方网址：http://mathjs.org/

An extensive math library for JavaScript and Node.js

Math.js is an extensive math library for JavaScript and Node.js.It features a flexible expression parser and offers an integrated solutionto work with numbers, big numbers, complex numbers, units, and matrices.Powerful and easy to use.

Features

• Supports numbers, big numbers, fractions, complex numbers, units, strings, arrays, and matrices.
• Is compatible with JavaScript’s built-in Math library.
• Contains a flexible expression parser.
• Supports chained operations.
• Comes with a large set of built-in functions and constants.
• Has no dependencies. Runs on any JavaScript engine.
• Is easily extensible.
• Open source.

JS工具包引用示例：

更多函数示例：

// functions and constants
math.round(math.e, 3);            // 2.718
math.atan2(3, -3) / math.pi;      // 0.75
math.log(10000, 10);              // 4
math.sqrt(-4);                    // 2i
math.pow([[-1, 2], [3, 1]], 2);
     // [[7, 0], [0, 7]]

// expressions
math.eval('1.2 * (2 + 4.5)');     // 7.8
math.eval('5.08 cm to inch');     // 2 inch
math.eval('sin(45 deg) ^ 2');     // 0.5
math.eval('9 / 3 + 2i');          // 3 + 2i
math.eval('det([-1, 2; 3, 1])');  // -7

// chaining
math.chain(3)
    .add(4)
    .multiply(2)
    .done(); // 14