Home > Article > Web Front-end > A brief discussion on the use of Math.atan() method in JavaScript_Basic knowledge
This method returns the arctangent of radians. The atan method returns a number between -pi/2 and π/2 radians.
Grammar
Math.atan( x ) ;
Here are the details of the parameters:
Return value:
Example:
<html> <head> <title>JavaScript Math atan() Method</title> </head> <body> <script type="text/javascript"> var value = Math.atan(-1); document.write("First Test Value : " + value ); var value = Math.atan(.5); document.write("<br />Second Test Value : " + value ); var value = Math.atan(30); document.write("<br />Third Test Value : " + value ); var value = Math.atan("string"); document.write("<br />Fourth Test Value : " + value ); </script> </body> </html>
This will produce the following results:
First Test Value : -0.7853981633974483 Second Test Value : 0.4636476090008061 Third Test Value : 1.5374753309166493 Fourth Test Value : NaN