Change Units

[Roopa ani]

How to change Units to cm in Illustrator using Javascript

[Zantcor]

active.document.rulerUnits.Centimeters;

I think the above line changes the units to centimeters

[elDudereno]

rulerUnits is read only unless you are making a new document with a preset. See reply 3 from Larry G. Schneider‌ here: Re: changing ruler units?.

Aditionally, if you want the active document you reference app.activeDocument.

[Ten A]

Reference below article:

Re: Set unit preferences (Javascript)

Ten