How to get the rotation angle value of a gradient in Adobe Illustrator in a script?

Question

JavaScript

How can I extract the value of the rotation angle of the gradient fill in the selected object through the script?

Answer 1

var angle = app.activeDocument.selection[0].fillColor.angle;
$.writeln(angle);

Adobe has fairly detailed scripting documentation:
https://www.adobe.com/devnet/illustrator/scripting.html