Usage of Math. atan2 () in JavaScript _ basic knowledge

This article mainly describes how to use the Math. atan2 () method in JavaScript. it is the basic knowledge in JS beginners. if you need it, you can refer to this method to return the arc tangent of the parameter quotient. The ATAN2 method returns the value between-pi and the angle theta at the point (x, y) of PI.
Syntax

Math.atan2( x, y ) ;

The following is the detailed information about the parameters:

• X and y: a number.

Return value:

Returns the arc tangent of a radian.

Math.atan2( ±0, -0 ) returns ±PI.Math.atan2( ±0, +0 ) returns ±0.Math.atan2( ±0, -x ) returns ±PI for x < 0.Math.atan2( ±0, x ) returns ±0 for x > 0.Math.atan2( y, ±0 ) returns -PI/2 for y > 0.Math.atan2( ±y, -Infinity ) returns ±PI for finite y > 0.Math.atan2( ±y, +Infinity ) returns ±0 for finite y > 0.Math.atan2( ±Infinity, +x ) returns ±PI/2 for finite x.Math.atan2( ±Infinity, -Infinity ) returns ±3*PI/4.Math.atan2( ±Infinity, +Infinity ) returns ±PI/4.

Example:

JavaScript Math atan2 () Method