1、首先新建AS3文档。
2、舞台上制作四个影片剪辑，实例名分别为mc0,mc1,mc2,mc3，注册点在中心，区域影片剪辑侍厚治越元件实例名为area_mc,注册点在左上角。如下图所示：
3、在主时间轴加如下代码：var mc_count:int=4;//可拖动的影片剪辑数量var timer:Timer=new Timer(20);//鼠标跟随定时儡泌掩羞器var mc_index:int=0;//当前拖动的影片剪辑索引var tempx:Number=0;//相对鼠标横坐标var tempy:Number=0;//相对鼠标纵坐标init();function init():void{timer.addEventListener(TimerEvent.TIMER,AutoFollowMouseEvent);//添加定时器事件for(var i:int=0;i<mc_count;i++){this["mc"+i].addEventListener(MouseEvent.MOUSE_DOWN,StartDragEvent);//鼠标按下开始拖动this["mc"+i].addEventListener(MouseEvent.MOUSE_UP,StopDragEvent);//鼠标弹起停止拖动this["mc"+i].isDrag=true;}}function StartDragEvent(e:MouseEvent):void{var obj:MovieClip=e.currentTarget as MovieClip;if(obj.isDrag==false)//如果元件的isDrag属性为false，则不允许拖动{return;}this.setChildIndex(obj,this.numChildren-1);//将元件移动到最上层mc_index=int(obj.name.slice(2));tempx=this.mouseX-obj.x;tempy=this.mouseY-obj.y;timer.start();//跟随鼠标}function AutoFollowMouseEvent(e:TimerEvent):void{this["mc"+mc_index].x=this.mouseX-tempx;this["mc"+mc_index].y=this.mouseY-tempy;}function StopDragEvent(e:MouseEvent):void{timer.stop();//下面是判断元件停留的位置是不是完全在区域内if(this["mc"+mc_index].x>=area_mc.x+this["mc"+mc_index].width/2&&this["mc"+mc_index].x<=area_mc.x+area_mc.width-this["mc"+mc_index].width/2){if(this["mc"+mc_index].y>=area_mc.y+this["mc"+mc_index].height/2&&this["mc"+mc_index].y<=area_mc.y+area_mc.height-this["mc"+mc_index].height/2){this["mc"+mc_index].isDrag=false;}}}
4、Ctrl+enter预览效果。
