AppleScript to JavaScript

Hi,

Just to test, I'm want to code a simple function in JavaScript to get the artist name of a track in iTunes.

In AppleScript, the script is :

on run {input, parameters}

  set t to input
  tell application "iTunes"
  set artist_name to artist of (item 1 of t)
  end tell
  return artist_name

end run

But in JavaScript, I don't know how to tell iTunes to do something so I tried this :

function run(input, parameters) {
  var t = input;
  var artist_name = t.artist;
  return artist_name;
}

Nothing is returned.

Can you help me ?

Thx.