JavaScript物件之數學函式運算-Math
阿新 • • 發佈：2019-01-02
JavaScript封裝了自己的函式庫，下面來看看最常用的數學運算函式，以及封裝使用的math.js工具包。
Math基本屬性和方法
MathJs
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.
<!DOCTYPE HTML> <html> <head> <script src="math.js" type="text/javascript"></script> </head> <body> <script type="text/javascript"> // use math.js math.sqrt(-4); // 2i </script> </body> </html>
更多函式示例：
// 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