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Math.acos() 함수는 입력한 숫자의 코사인 역함수 값을 반환한다. (반환값은 라디안 단위이다.) 즉,Syntax
Math.acos(x)Parameters
x- 숫자 형식.
Return value
[-1, 1]의 숫자를 입력했을 때, 입력한 숫자의 코사인 역함수 값을 반환한다. 그 외의 숫자를 입력하면, NaN을 반환한다.
Description
The Math.acos() method returns a numeric value between 0 and π radians for x between -1 and 1. If the value of x is outside this range, it returns NaN.
Because acos() is a static method of Math, you always use it as Math.acos(), rather than as a method of a Math object you created (Math is not a constructor).
Examples
Using Math.acos()
Math.acos(-2); // NaN Math.acos(-1); // 3.141592653589793 Math.acos(0); // 1.5707963267948966 Math.acos(0.5); // 1.0471975511965979 Math.acos(1); // 0 Math.acos(2); // NaN
For values less than -1 or greater than 1, Math.acos() returns NaN.
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.0. |
| ECMAScript 5.1 (ECMA-262) The definition of 'Math.acos' in that specification. |
Standard | |
| ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Math.acos' in that specification. |
Standard | |
| ECMAScript 2017 Draft (ECMA-262) The definition of 'Math.acos' in that specification. |
Draft |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |