Question

package{
import flash.display.MovieClip;
import flash.utils.Timer;
import flash.events.TimerEvent;
import flash.events.MouseEvent;

public class Main extends MovieClip{

    public var ability1,ability3:Ability;

    public function Main(){

        var ability1 = new Ability(30,30,"Ability Name","...",5,false);
        addChild(ability1);         
        var ability2 = new Ability(60,30,"Ability Name2","...",3,false);
        addChild(ability2);
        var ability3 = new Ability(45,60,"Ability Name3","...",5,true);
        addChild(ability3);
        stage.addEventListener(MouseEvent.CLICK, Check);    

        trace(ability1.Points); //outputs the value

    }
    public function Check(event:MouseEvent):void{

        trace(ability1.Points); //outputs error

    }
}}

第二个跟踪给出了这个错误：“TypeError：错误＃1010：一个术语未定义且没有属性。在Main / Check（）”你能指出我至少吗？

感谢。

Answer 1

通过在var方法中使用Main语句，您可以将实例分配给仅在该方法范围内的局部变量。按如下方式更新您的代码，您应该得到您期望的结果：

package{
    import flash.display.MovieClip;
    import flash.utils.Timer;
    import flash.events.TimerEvent;
    import flash.events.MouseEvent;

    public class Main extends MovieClip{

        public var ability1:Ability;
        public var ability3:Ability;

        public function Main(){

            // I'm a local property scoped only to this method
            var ability2 = new Ability(60,30,"Ability Name2","...",3,false);
            addChild(ability2);

            // We're instance properties and can be accessed from any method 
            // in the class (and from outside the class as well)
            ability1 = new Ability(30,30,"Ability Name","...",5,false);
            addChild(ability1);  

            ability3 = new Ability(45,60,"Ability Name3","...",5,true);
            addChild(ability3);
            stage.addEventListener(MouseEvent.CLICK, Check);    

            trace(ability1.Points); //outputs the value

        }
        public function Check(event:MouseEvent):void{

            trace(ability1.Points); //outputs the value
            trace(ability3.Points); //outputs the other value
        }
    }
}

未定义的属性AS3

1 个答案: