AS 3.0加载图片纠结的问题解决了，感谢菜头帮的兄弟

import flash.net.URLLoader;
import flash.events.Event;
import flash.net.URLRequest;
import flash.display.MovieClip;
import flash.display.Loader;

var tmp:MovieClip=new MovieClip();

        tmp.x =100;
        tmp.y =100;

var picLoader:Loader=new Loader();
 picLoader.load(new URLRequest("02.jpg"));

//之前一直是写成picLoader.loaderInfo.addEventListener(Event.COMPLETE,picAdd);搞了好长时间都不行哦
 picLoader.contentLoaderInfo.addEventListener(Event.COMPLETE,picAdd);
  function picAdd(e:Event):void{
  tmp.addChild(picLoader);
 }