让Canvas支持键盘事件

Canvas自身是不响应键盘事件的，可以添加如下代码是Canvas具备这个功能。

AS 代码

var v:Canvas = new Canvas();
v.addEventListener(KeyboardEvent.KEY_DOWN,OnkeyDown);
v.addEventListener(MouseEvent.MOUSE_UP.OnMouseUP);
private function OnkeyDown(e:KeyboardEvent):void{
     Alert.show(e.keyCode.toString());
}
private function OnMouseUP(e:MouseEvent):void{
     (e.currentTarget as Canvas).setFocus();
}