无法通过stage.getChildAt访问MovieClips的时间轴

Question

I've simplified my problem down to this self explanatory code. Why doesn't each Movie Clip on the stage go to frame two? The error occurs on line six.

stage.addEventListener(Event.ENTER_FRAME,update);
function update(e:Event)
{
    for (var i:int=0; i<stage.numChildren; i++)
    {
        stage.getChildAt(i).gotoAndPlay(2);//error here
    }
}

Thank you for your help.

Answer 1

The getChildAt method returns an instance of DisplayObject (see documentation ), but you're trying to call a method on the instance which is a member of the MovieClip class. You need to cast the instance returned to the correct type:

stage.addEventListener(Event.ENTER_FRAME,update);
function update(e:Event)
{
    for (var i:int=0; i<stage.numChildren; i++)
    {
        MovieClip(stage.getChildAt(i)).gotoAndPlay(2); // cast instance to MovieClip
    }
}