Actionscript 3 如何使用变量创建类的实例？

我试图将一个变量传递给我的一个类中的一个方法，以便使用它创建正确的movieClip（image）

我的类代码如下所示：

package  {
    import flash.display.MovieClip;
    import flash.display.Sprite;


    public class SlideShow extends MovieClip{

        public function SlideShow() 
            {

                             //does something on start

        }

          //This function should take the string and use it as the class name below.
          public function addImages(BackGround:String):void
             {
            trace(BackGround);

            var main_bg:BackGround = new BackGround();
            addChild(main_bg);
                 }
         }
    }

var shoeSlide:SlideShow = new SlideShow(); 
shoeSlide.addImages("menPant"); 

当我从主时间线调用该方法时，它看起来如下所示：

package  {
    import flash.display.MovieClip;
    import flash.display.Sprite;


    public class SlideShow extends MovieClip{

        public function SlideShow() 
            {

                             //does something on start

        }

          //This function should take the string and use it as the class name below.
          public function addImages(BackGround:String):void
             {
            trace(BackGround);

            var main_bg:BackGround = new BackGround();
            addChild(main_bg);
                 }
         }
    }

var shoeSlide:SlideShow = new SlideShow(); 
shoeSlide.addImages("menPant"); 

所以

“menPant”

实际上是我分配给一个包含一些图像的movieclip类的名称

我得到以下错误：

SlideShow.as, Line 30   1046: Type was not found or was not a compile-time constant: BackGround.

---

如果flash没有自动为您导入getDefinitionByName，请确保在类代码的顶部导入getDefinitionByName。这应该行得通

public function addImages(BackGround:String):void
{
    var symbol_class:Class = getDefinitionByName(BackGround);
    //EDIT: removed data type :BackGround -- this will give an error.
    var main_bg = new symbol_class();
    addChild(main_bg);
}

---

太好了，这就是我要找的+1检查