键盘按下 子弹射击 (有间隔)

/*文档类*/
package 
{
	import flash.display.Sprite;
	import flash.events.KeyboardEvent;
	import flash.events.Event;
	import flash.ui.Keyboard;

	public class Main extends Sprite
	{

		private var flag:Boolean = true;
		private var bulletArr:Array = new Array  ;
		private var bullet:Bullet;
		private var time:int;

		public function Main()
		{
			stage.addEventListener(KeyboardEvent.KEY_DOWN,keyDownHandler);
			stage.addEventListener(KeyboardEvent.KEY_UP,keyUpHandler);
			addEventListener(Event.ENTER_FRAME,enterFrameHandler);
		}

		private function keyDownHandler(e:KeyboardEvent):void
		{
			if (e.keyCode == Keyboard.SPACE)
			{
				if(time==0)
				{
					fire();
				}
				time++;
				//flag = false;
				if (time % 5 == 0)
				{
					fire();
				}
			}
			else if (e.keyCode == Keyboard.A)
			{
				mc.x -=  5;
			}
			else if (e.keyCode == Keyboard.D)
			{
				mc.x +=  5;
			}
		}

		private function keyUpHandler(e:KeyboardEvent):void
		{
			if (e.keyCode == Keyboard.SPACE)
			{
				//flag = true;
				time = 0;
			}
		}

		private function enterFrameHandler(e:Event):void
		{
			for (var i:int=0; i<bulletArr.length; i++)
			{
				if (bulletArr[i].y < 0)
				{
					removeChild(bulletArr[i]);
					bulletArr.splice(i,1);
				}
			}
		}

		private function fire():void
		{
			bullet = new Bullet(10,10,0XFF0000);
			bullet.x = mc.x;
			bullet.y = mc.y;
			addChild(bullet);
			bulletArr.push(bullet);
		}

	}

}

/*子弹类*/
package 
{
	import flash.display.Sprite;
	import flash.events.Event;

	public class Bullet extends Sprite
	{
		private var _width:Number;
		private var _height:Number;
		private var color:uint;
		private var bullet:Bullet;

		public function Bullet(_width:Number=10,_height:Number=10,color:uint=0XFF0000)
		{
			this._width = _width;
			this._height = _height;
			this.color = color;
			drawBullet();
			addEventListener(Event.ENTER_FRAME,enterFrameHandler,false,0,true);
		}


		private function drawBullet():void
		{
			graphics.beginFill(color);
			graphics.drawRect(0,0,_width,_height);
			graphics.endFill();
		}

		private function enterFrameHandler(e:Event):void
		{
			if (this.y >-10)
			{
				this.y -=  5;
			}
		}

	}
}