打气球（flash入门级示例）

【核心代码】

package {

             import flash.display.*;

             import flash.events.*;

             import flash.text.*;

             import flash.utils.Timer;

             import flash.geom.Matrix;

             [SWF(width=800, height=465, frameRate=24)]

             public class main extends Sprite {

              private var pointNum:Number=0;

              private var pTxt:TextField = addChild(new TextField()) as TextField;

              private var matrix:Matrix = new Matrix();

              public function main(){

               var t:Timer = new Timer(500);

               var tFun=function(){matrix.createGradientBox(800,465,Math.PI/2,0,0),graphics.beginGradientFill(GradientType.LINEAR,[0x00CCFF,0xFFFFFF],[0.3,1],[0,255],matrix),graphics.drawRect(0,0,800,465),t.addEventListener(TimerEvent.TIMER,function(e){var mc;

               var mcFun = function(){mc=addChild(new balloon(Math.random()*10   1)),mc.x=Math.round(Math.random()*(700-30)) 30,mc.y=465}.apply();

               mc.addEventListener(MouseEvent.MOUSE_DOWN, function(e){removeChild(e.target.parent),pTxt.htmlText='分数:' (  pointNum).toString() ''});}),t.start()}.apply();

              }

             }

            }

             import flash.display.Sprite;

             import flash.events.Event;

             class balloon extends Sprite{

              private var speed:Number;

              private var s:Sprite =addChild(new Sprite()) as Sprite; 

              public function balloon(_t){

               var sFun=function(){s.graphics.lineStyle(1, 0),s.graphics.curveTo(-10, 30, 0, 60),s.graphics.beginFill(Math.random() * 0xffffff   0xff000000),s.graphics.drawCircle(0,0,20),speed=Math.round(_t)}.apply();

               s.addEventListener(Event.ENTER_FRAME,function(e){s.y-= speed;});

               }

            }