Question

以下是我的构建器类, 然而当我试图添加参数时, 当我即时将我的对象添加时, 我发现一个错误, 说我没有默认的构建器。我基本上想将字符串传递到对象, 但并非所有对象都会得到字符串。

    public function Shortcuts(opencontent:String){
        highlight = new shortcuthighlight();


        highlight.x = highlight.x - highlight.width/2;
        highlight.y = highlight.y - highlight.height/2;
        highlight.visible = false;
        addChild(highlight);
        setChildIndex(highlight,0);

        this.addEventListener(MouseEvent.ROLL_OVER, addHighlight);
        this.addEventListener(MouseEvent.ROLL_OUT, removeHighlight);

        this.addEventListener(MouseEvent.MOUSE_DOWN, dragOn);
        this.addEventListener(MouseEvent.MOUSE_UP, dragOff);





    }

这就是我如何创造我的东西。

for(var i=0; i<shortcutsArray.length;i++){
        var className:Class = getDefinitionByName(shortcutsArray[i][0]) as Class;
        var object:Object = new className( hey );
        var mc:MovieClip = MovieClip(object);
        mc.x = shortcutsArray[i][1];
        mc.y= shortcutsArray[i][2];
        addChild(mc);


    }

Answer 1

如果您想要 opencontent 是可选的, 您可以设置默认参数 :

public function Shortcuts(opencontent:String=null)
{
    /* ... */
}

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