public class loadPic_mc extends MovieClip { 
//类名原来就是脚本文件名 
public var fun:Function; 
//定义了一个属性他的再次出现在最后一行 
private var per_txt:TextField; 
//显示加载进度 
private var loadPic:Loader; 
private var dispatcher:IEventDispatcher; 
//上面的这些变量曾经我是声明在主时间轴的最顶端的 
public function loadPic_mc(str:String):void {//构造函数，现在完全多了个这个东东，据我观察，当你声明一个类时，不管你愿不愿意它都会执行这个函数 
var request:URLRequest=new URLRequest(str); 
loadPic=new Loader(); 

dispatcher=loadPic.contentLoaderInfo; 
dispatcher.addEventListener(Event.COMPLETE,loadComH); 
dispatcher.addEventListener(Event.OPEN,loadOpenH); 
dispatcher.addEventListener(ProgressEvent.PROGRESS,loadProgH); 
//订阅事件呢 
loadPic.load(request); 
//一个载入多写了几行，要是从3.0转型到2.0那该多快 


per_txt=new TextField(); 
per_txt.x=10; 
per_txt.y=55; 
per_txt.width=150; 
per_txt.textColor=0xB3CCCC; 
this.motionLoad_mc.visible=false; 
//在loadPic_mc的舞台上所含的一个MC，有时间轴的 
this.addChild(loadPic); 
//曾经用this指东指西的，现在呢，不能再乱指了，只能指本类, 
this.addChild(per_txt); 
} 
private function loadOpenH(event:Event):void { 
this.motionLoad_mc.visible=true; 
per_txt.text="正在载入。。。。"; 
loadPic.alpha=0; 
//开始下载时调度 
} 
private function loadProgH(event:ProgressEvent):void { 
per_txt.text="已载入。。。。"+uint(event.bytesLoaded/event.bytesTotal*100)+"%"; 
//下载过程中调度 

} 
private function loadComH(event:Event):void { 
var aTween:Tween = new Tween( loadPic, "alpha", Back.easeOut,0, 1, 2, true); 
aTween.addEventListener(TweenEvent.MOTION_FINISH,disPic); 
//其实完全没必要订阅这个事件，只是想联系一下Tween类 
this.removeChild(this.motionLoad_mc); 
this.removeChild(per_txt); 
//显示对象很帅吧以后就再也不要_mc[newmc+”I”]去找对象了 

dispatcher.removeEventListener(Event.COMPLETE,loadComH); 
dispatcher.removeEventListener(Event.OPEN,loadOpenH); 
dispatcher.removeEventListener(ProgressEvent.PROGRESS,loadProgH); 
//清除监听，便于处理垃圾 
} 
private function disPic(event:TweenEvent){ 
fun(); 
//调用函数fun 
} 
} 
} 
//写完此类了 其实3.0语言一看很有层次感的，8错8错 

package ActionScript{ 
import flash.net.URLLoader; 
import flash.net.URLRequest; 
import flash.events.*; 

import flash.display.SimpleButton; 
import flash.display.Sprite; 
import fl.transitions.Tween; 
import fl.transitions.easing.Back; 
import ActionScript.loadPic_mc; 

public class rejigger_mc extends Sprite { 
private var sprite:Sprite; 
private var portraitXml:XML; 
private var loadXml:URLLoader; 
private var dispatcher:IEventDispatcher; 
private var i:uint; 
private var len:uint; 
private var m:uint; 
//这些属性都是私有的从此类外部是无法访问的 

public function rejigger_mc():void { 
var request:URLRequest=new URLRequest("portrait.xml"); 
loadXml=new URLLoader(request); 
//载入外部XML文件 
loadXml.addEventListener(Event.COMPLETE,comH); 

} 

private function comH(event:Event) { 
portraitXml=new XML(event.target.data); 
sprite=new Sprite(); 
//这个其实就是装loadPic_mc的容器 
sprite.x=10; 
sprite.y=10; 
this.addChild(sprite); 
var maskSprite:Sprite=new Sprite(); 
//只是为了遮盖 所以不必添加到显示列表中 
maskSprite.graphics.beginFill(0xffffff); 
maskSprite.graphics.drawRect(10,10,150,80); 
maskSprite.graphics.endFill(); 
sprite.mask=maskSprite; 

this.right_btn.addEventListener(MouseEvent.CLICK,moveRight); 
this.left_btn.addEventListener(MouseEvent.CLICK,moveLeft); 
//又该订阅事件了 
i=0; 
len=0; 
for (var item:String in portraitXml.part) { 
len++; 
//不知道怎么取得XML子节点的长度，要是转换为XML文档类的话觉得很麻烦 
} 
loadPor(); 

loadXml.removeEventListener(Event.COMPLETE,comH); 
//卸载监听 
} 
private function loadPor():void { 
if (i<len) { 
var loadPic:loadPic_mc=new loadPic_mc(portraitXml.part{i}.@path);//基于发布系统的问题,此处的大括号需要换为中括号. 
loadPic.fun=loadPor; 
sprite.addChild(loadPic); 
//在sprite里添加显示对象loadPic 
loadPic.x=i*150; 

i++; 
} else { 
return; 
} 
} 
private function moveRight(event:MouseEvent) { 
if (m>0) { 
m--; 
var aTween:Tween = new Tween( sprite, "x", Back.easeOut, sprite.x, 10-m*150, 1, true); 
//移动是直接移动sprite，因为sprite里含N多个loadPic 
} else { 
return; 
} 
} 
private function moveLeft(event:MouseEvent) { 
if (m<len-1) { 
m++; 
var aTween:Tween = new Tween( sprite, "x", Back.easeOut, sprite.x, 10-m*150, 1, true); 
} else { 
return; 
} 
} 
} 
}