Flash战机游戏02

?package { ?import flash.display.Sprite; ?import flash.events.Event; ?/**功能在01的基础上添加事件监听功能是战机移动 ? * ... ? * @author ? */ ?public class? StartPlane01 extends Sprite ?{ ??//定义成员变量，作用于整个类中 ??var fighter:Fighter; ??var boss:Boss; ?? ??public function StartPlane01():void {//构造方法 ???//创建战机 ???fighter = new Fighter(); ???boss = new Boss(); ???//定义战机出现的坐标 ???fighter.x = 100; ???fighter.y = 100; ???//让战机随机出现 ???boss.x = Math.random() * stage.stageWidth; ???boss.y = 0; ???//添加战机到舞台中 ???addChild(fighter); ???addChild(boss); ???//添加战机监听 ???addEventListener(Event.ENTER_FRAME,onEnterFrame); ??? ??? ??} ?? ??public function onEnterFrame(event:Event):void {//事件方法也叫刷屏方法 ??? ???boss.y++; ??? ??} ?? ?} ? }