Does Alert exist in AS3?

Question

Adobe Flash

Good day.
The question seems to be quite simple: is it possible to show some kind of alert box in AS3? I googled it and didn't find anything worthwhile.
Seeing a large piece of code on such an empty question (after alert('hello world') in js) is unusual for me.

Answer 1

The ExternalInterface serves as a bridge between flash and js . Only works in the browser, since there is no window object locally whose method is allert .
And I know that you write in frames, and that is why I emphasize that you should only be interested in the code in the constructor. I don't write in frames.

package
{
  import flash.display.Sprite;
  import flash.external.ExternalInterface;
  
  public class Main extends Sprite 
  {
    public function Main() 
    {
      if (ExternalInterface.available) 
      {
        ExternalInterface.call('alert', 'HelloWorld');
      }
    }
  }
  
}