The Math.acos()
function returns the arccosine (in radians) of a number, that is
Math.acos(x)
x
x
is between -1
and 1
.The arccosine (angle in radians) of the given number if it's between -1
and 1
; otherwise, NaN
.
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).
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
.
Desktop | ||||||
---|---|---|---|---|---|---|
acos |
1 | 12 | 1 | 3 | 3 | 1 |
Mobile | ||||||
---|---|---|---|---|---|---|
acos |
1 | 18 | 4 | 10.1 | 1 | 1.0 |
Server | |
---|---|
acos |
0.1.100 |
© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/acos