清理MovieClip中的嵌套动态MovieClip(类)

Question

我正在尝试清理一些添加到MovieClip中的类，但似乎无法将MovieClip(类)设置为null。正确的做法是什么？

private var mcHolder:MovieClip = new MovieClip()
    private var mcClass:MovieClip

    private function someFunction():void
    {
        mcClass = new SomeClass()
        mcHolder.addChild(mcClass)
    }

    private function clean():void
    {
        i = mcHolder.numChildren
        if (i > 0)
        {
            while (i--)
            {
                MovieClip(mcHolder.getChildAt(i)).clean()
                **MovieClip(mcHolder.getChildAt(i)) = null**
                mcHolder.removeChild(MovieClip(mcHolder.getChildAt(i)))
            }
        }
    }

Answer 1

    private function clean():void
    {
        while (mcHolder.numChildren > 0)
        {
           mcHolder.removeChildAt(0);
        }
    }