Extract the page numbers into a csv file

I am not sure how to build it, and save the data in a csv file, as I never used JavaScript for Adobe. I just know that I have to build a function, and also assign this function to a shortcut that would appear in the Document tab. I am a newbie in JavaScript. Any idea how to start building the code? Thanks!

I found the code that extracts the page labels, however I am not sure how to write the results to a .csv file, not the console. Also, is there a way to add a menu item with the script?

Listed the code here:

var labels = this.getPageLabel(0);

for (var i=1; i<this.numPages; i++)

labels += ", " + this.getPageLabel(i);

console.println(labels);