如何在ActionScript 3中正确测试类继承？ [英] How to properly test for class inheritance in ActionScript 3?

问题描述

在ActionScript 3中，您可以确定对象O是类C还是使用...扩展或实现类C（直接或间接）的类。

In ActionScript 3, you can figure out whether object O is of class C or of a class that extends or implements class C (directly or indirectly) using...

if (O is C) {
    ...
}

我想做的是测试类CC是否扩展或实现类C（直接或间接），而不必实例化一个对象。

What I want to do is to test whether class CC extends or implements class C (directly or indirectly), without having to instantiate an object.

在Java中，您将使用...

In Java, you would use...

if (C.isAssignableFrom (CC)) {
    ...
}

http://java.sun.com/javase/6/docs/ api / java / lang / Class.html＃isAssignableFrom（java.lang.Class）

ActionScript 3如何？

How about ActionScript 3?

谢谢！

推荐答案

你可以直接在CC上调用describeType您不必实例化对象。

You can call describeType() on CC directly. You do not have to instantiate the object.

var typeXML:XML = describeType(CC);
if(typeXML.factory.extendsClass.(@type=="C").length() > 0)
{
...

这不是我想要的那么干净，但我找不到更好的东西。

It's not as clean as I'd like but I can't find anything better.

（通过Amarghosh：[ http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/utils/package.html#describeType（）] [1] ）

(via Amarghosh: [http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/utils/package.html#describeType()][1] )

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