The Math.asin()
function returns the arcsine (in radians) of a number, that is
Math.asin(x)
x
The arcsine (in radians) of the given number if it's between -1 and 1; otherwise, NaN
.
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).
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
.
Desktop | ||||||
---|---|---|---|---|---|---|
asin |
1 | 12 | 1 | 3 | 3 | 1 |
Mobile | ||||||
---|---|---|---|---|---|---|
asin |
1 | 18 | 4 | 10.1 | 1 | 1.0 |
Server | |
---|---|
asin |
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/asin