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Math.acos()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015년 7월.
Math.acos() 함수는 주어진 수의 아크코사인 값을 숫자(라디안)로 반환합니다. 즉,
시도해 보기
// Calculates angle of a right-angle triangle in radiansfunction calcAngle(adjacent, hypotenuse) { return Math.acos(adjacent / hypotenuse);}console.log(calcAngle(8, 10));// Expected output: 0.6435011087932843console.log(calcAngle(5, 3));// Expected output: NaN구문
js
Math.acos(x);매개변수
x각도를 나타내는 라디안.
반환 값
-1과 1 사이의 값이 주어진 경우, 그 값의 아크코사인. 아닐 경우NaN
설명
TheMath.acos() method returns a numeric value between 0 and π radians forx between -1 and 1. If the value ofx is outside this range, it returnsNaN.
Becauseacos() is a static method ofMath, you always use it asMath.acos(), rather than as a method of aMath object you created (Math is not a constructor).
예제
UsingMath.acos()
js
Math.acos(-2); // NaNMath.acos(-1); // 3.141592653589793Math.acos(0); // 1.5707963267948966Math.acos(0.5); // 1.0471975511965979Math.acos(1); // 0Math.acos(2); // NaNFor values less than -1 or greater than 1,Math.acos() returnsNaN.
명세
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-math.acos |