非常非常简单的效果，按任意键进行方块的跳跃，有二段跳效果和轻跳和重跳效果，根据按键长短判定的。这是在兄弟会论坛做的一道题，很应该转来跟大家分享下～
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代码如下：
package?{
/*author?:?CYPL*/
????????import?flash.display.*;
????????import?flash.events.*;
????????import?flash.utils.Timer;
????????public?class?JumpTest?extends?Sprite?{
????????????????private?static??const?G:int=1;
????????????????private?var?box:Sprite;
????????????????private?var?landObject:Sprite;
????????????????private?var?ySpeed:int=0;
????????????????private?var?jumpSpeed:int=-15;
????????????????private?var?keyPressed:Boolean=?false;
????????????????private?var?keyReleased:Boolean=true;
????????????????private?var?comboJump:Boolean=false;
????????????????private?var?inAir:Boolean=true;
????????????????private?var?timer:Timer;
????????????????public?function?JumpTest()?{
????????????????????????box=drawRect((stage.stageWidth-50)/2,100,50,50,0xff0000);
????????????????????????landObject=drawRect(0,300,stage.stageWidth,20);
????????????????????????(timer=new?Timer(30)).start();
????????????????????????configureControl();
????????????????}
????????????????private?function?configureControl():void?{
????????????????????????stage.addEventListener(KeyboardEvent.KEY_DOWN,keyDownHandler,false,0,true);
????????????????????????stage.addEventListener(KeyboardEvent.KEY_UP,keyUpHandler,false,0,true);
????????????????????????timer.addEventListener(TimerEvent.TIMER,timerHandler,false,0,true);
????????????????}
????????????????private?function?drawRect(posX:Number,posY:Number,w:Number,h:Number,color:uint=0):Sprite?{
????????????????????????var?rect:Sprite;
????????????????????????with?(rect=new?Sprite)?{
????????????????????????????????graphics.beginFill(color);
本文转自：http://www.5uflash.com/flashjiaocheng/Flashaschengxu/2988.html