参考文章： http://www.blueidea.com/tech/multimedia/2008/5842_2.asp

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/djy1135/archive/2009/11/13/4807925.aspx

一、目的

bb.swf的元件库中有一个元件，在aa.swf中调用这个元件，显示到舞台上

二、步骤

bb.swf

1.新建bb.fla，在上面画一个圆

2.选择这个圆，将其转换为元件，并选择”Export for ActionScript”，类名取为”Yuan”

3.在舞台上删除这个元件（删除后，只在元件库中有该元件）

4.Ctrl+Enter 运行bb.fla ， 生成bb.swf

aa.swf

1.新建aa.fla

2.在时间轴上加如下代码

var cl:ClassLoader = new ClassLoader(“bb.swf”);   //加载bb.swf文件
      cl.addEventListener(Event.COMPLETE, cm_fun);

function cm_fun(e:Event){
          var Yuan:Class = cl.getClass(“Yuan”) as Class;
          var yuan:DisplayObject = new Yuan();
          yuan.x = 50;
          yuan.y = 100;
          yuan.alpha = .5;
   
          addChild(yuan);
      }

三、类加载文件

package {

import flash.display.Loader;
        import flash.net.URLRequest;
        import flash.utils.ByteArray;
        import flash.events.Event;
        import flash.events.ProgressEvent;
        import flash.events.EventDispatcher;
        import flash.system.LoaderContext;

public class ClassLoader extends EventDispatcher{
  
           public var url:String;
           public var loader:Loader;
          
           //构造函数
           public function ClassLoader(obj:Object = null,lc:LoaderContext = null) {
              if(obj != null){
                if(obj is ByteArray){
                  loadBytes(obj as ByteArray,lc);
                }else if(obj is String){
                  load(obj as String,lc);
                }else{
                  throw new Error(“参数错误，构造函数第一参数只接受ByteArray或String”);
                }
              }
           }
  
            //加载
           public function load(_url:String,lc:LoaderContext = null):void{
              url = _url;
              loader = new Loader;
              loader.load(new URLRequest(url),lc);
              addEvent();
            }
  
           //加载字节
           public function loadBytes(bytes:ByteArray,lc:LoaderContext = null):void{
              loader = new Loader;
              loader.loadBytes(bytes,lc);
              addEvent();
            }
  
          //开始侦听
            private function addEvent():void{
              loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS,progressFun);
              loader.contentLoaderInfo.addEventListener(Event.COMPLETE,completeFun);
            }
  
            //结束侦听
            private function delEvent():void{
              loader.contentLoaderInfo.removeEventListener(ProgressEvent.PROGRESS,progressFun);
              loader.contentLoaderInfo.removeEventListener(Event.COMPLETE,completeFun);
           }
  
            //加载成功，发布成功事件
            private function completeFun(e:Event):void {
              delEvent();
              dispatchEvent(e);
            }
  
           //加载过程
            private function progressFun(e:ProgressEvent):void{
              dispatchEvent(e);
            }
  
            //获取定义
            public function getClass(className:String):Object {
              return loader.contentLoaderInfo.applicationDomain.getDefinition(className);
           }
  
           //是否含有该定义
            public function hasClass(className:String):Boolean {
              return loader.contentLoaderInfo.applicationDomain.hasDefinition(className);
            }
  
            //清除
           public function clear():void{
              loader.unload();
              loader = null;
           }
         }
        }