问题描述
在ActionScript 3中，你可以计算出物体O是否是C类的，或者扩展或实现C类（直接或间接）使用一类...
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) {
...
}
我想要做的是测试是否CC级扩展或实现C类（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，你可以使用...
In Java, you would use...
if (C.isAssignableFrom (CC)) {
...
}
http://java.sun.com/javase/6/docs/api/java/lang/Class.html#isAssignableFrom%28java.lang.Class%29
怎么样的ActionScript 3？
How about ActionScript 3?
谢谢！
推荐答案
您可以在CC直接调用describeType（）全面。你不必实例化对象。
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)
{
...
这不是那样干净，我想，但我不能找到更好的东西。
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%28%29%5D%5B1%5D ）
(via Amarghosh: [http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/utils/package.html#describeType%28%29%5D%5B1%5D )
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