Home > Article > Web Front-end > Introduction to the use of arcsine function Math.asin() in JavaScript_Basic knowledge
This method returns the arcsine of the number in radians. The ASIN method returns a value between -1 and 1, x-pi/2 and PI/2 radians. If the number value is outside this range, NaN is returned.
Grammar
Math.asin( x ) ;
Here are the details of the parameters:
Return value:
Returns the arcsine of a number in radians.
Example:
<html> <head> <title>JavaScript Math asin() Method</title> </head> <body> <script type="text/javascript"> var value = Math.asin(-1); document.write("First Test Value : " + value ); var value = Math.asin(null); document.write("<br />Second Test Value : " + value ); var value = Math.asin(30); document.write("<br />Third Test Value : " + value ); var value = Math.asin("string"); document.write("<br />Fourth Test Value : " + value ); </script> </body> </html>
This will produce the following results:
First Test Value : -1.5707963267948965 Second Test Value : 0 Third Test Value : NaN Fourth Test Value : NaN