JavaScript asin() method

Definition and usage

asin() The method returns the arcsine value of a number, and the returned value is the radian value between -PI/2 and PI/2.

Comment:If the parameter x If the value is out of the range of -1 to 1, the browser will return NaN.

Tip:1 will return the value of PI/2. -1 will return the value of -PI/2.

Example

Returns the arcsine of a number:

Math.asin(0.5);

Try it yourself

Syntax

Math.asin(x)

Parameter value

Parameter Description
x Required. Number.

Technical details

Return value: Number, from -PI/2 to PI/2, if the value is out of the range of -1 to 1, it returns NaN.
JavaScript version: ECMAScript 1

Browser Support

Math.asin() Is an ES1 Feature (JavaScript 1999). All browsers fully support it:

Chrome IE Edge Firefox Safari Opera
Support Support Support Support Support Support

Related Pages

Tutorial:JavaScript Mathematics