[AS3]as3中stage按键监听

[AS3]as3中stage按键监听

代码 
 
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->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; 
                } 
                 
        } 
}