Math.asin()
The Math.asin()
function returns the arcsine (in radians)
of a number, that is
Syntax
Math.asin(x)
Parameters
x
-
A number.
Return value
The arcsine (in radians) of the given number if it's between -1 and
1; otherwise, NaN
.
Description
The Math.asin()
method returns a numeric value between
and
radians for x between -1 and 1. If the value of x is
outside this range, it returns NaN
.
Because asin()
is a static method of Math
, you always use it
as Math.asin()
, rather than as a method of a Math
object you
created (Math
is not a constructor).
Examples
Using Math.asin()
Math.asin(-2); // NaN
Math.asin(-1); // -1.5707963267948966 (-pi/2)
Math.asin(0); // 0
Math.asin(0.5); // 0.5235987755982989
Math.asin(1); // 1.5707963267948966 (pi/2)
Math.asin(2); // NaN
For values less than -1 or greater than 1, Math.asin()
returns
NaN
.
Specifications
Specification |
---|
ECMAScript Language Specification # sec-math.asin |
Browser compatibility
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