[AS3]stage按键KeyIsDown的监听源代码示例

[AS3]stage按键KeyIsDown的监听源代码示例

package tools{ 
        public class KeyIsDown{ 
                private static var obj; 
                public static function init(stage){ 
                        obj = new Object(); 
                        stage.addEventListener("keyDown", keydownHandler); 
                        stage.addEventListener("keyUp", keyupHandler); 
                } 
                public static function isDown(key){ 
                        return(obj[key] ? true : false); 
                } 
                private static function keydownHandler(event){ 
                        obj[event.keyCode] = true; 
                } 
                private static function keyupHandler(event){ 
                        obj[event.keyCode] = false; 
                } 
        } 
} 

开始的时候在文档类构造的时候KeyIsDown.init(stage)一下
然后在任何地方KeyIsDown.isDown(keycode)都可以返回keycode有没有按下了