AS3中的反射（速記） 分析
2024-09-12 17:50:57
供稿：網友
取類名： 傳進一個object，返回類的全名
var loader:URLLoader = new URLLoader( );
var className:String = getQualifiedClassName(loader);
trace(className); // Displays flash.net.URLLoader
取父類的類名：傳進一個object，返回父類的類名
var loader:URLLoader = new URLLoader( );
var className:String = getQualifiedSuperclassName(loader);
trace(className); // Displays flash.events.EventDispatcher
根據類名取類
var classReference:Class = Class(getDefinitionByName("flash.net.URLLoader"));
//一但你得到了類的引用后，就可以這樣
var instance:Object = new classReference( );
getQualifiedClassName( ) 或 getQualifiedSuperclassName( ) 與 getDefinitionByName() 結合使用的例子：
var loader:URLLoader = new URLLoader( );
var className:String = getQualifiedClassName(loader);
var classReference:Class = Class(getDefinitionByName(className));
var instance:Object = new classReference( );
Introspection：describeType( )返回對象的類型描述
例如：
var loader:URLLoader = new URLLoader( );
var description:XML = describeType(loader);
trace(description);
輸出:
<type name="flash.net::URLLoader" base="flash.events::EventDispatcher"
isDynamic="false" isFinal="false" isStatic="false">
<metadata name="Event">
<arg key="name" value="httpStatus"/>
<arg key="type" value="flash.events.HTTPStatusEvent"/>
</metadata>
<metadata name="Event">
<arg key="name" value="securityError"/>
<arg key="type" value="flash.events.SecurityErrorEvent"/>
</metadata>
<metadata name="Event">
<arg key="name" value="ioError"/>
<arg key="type" value="flash.events.IOErrorEvent"/>
</metadata>
<metadata name="Event">
<arg key="name" value="progress"/>
<arg key="type" value="flash.events.ProgressEvent"/>
</metadata>
<metadata name="Event">
<arg key="name" value="complete"/>
<arg key="type" value="flash.events.Event"/>
</metadata>
<metadata name="Event">
<arg key="name" value="open"/>
<arg key="type" value="flash.events.Event"/>
</metadata>
<extendsClass type="flash.events::EventDispatcher"/>
<extendsClass type="Object"/>
<implementsInterface type="flash.events::IEventDispatcher"/>
<constructor>
<parameter index="1" type="flash.net::URLRequest" optional="true"/>
</constructor>
<variable name="bytesTotal" type="uint"/>
<variable name="data" type="*"/>
<method name="load" declaredBy="flash.net::URLLoader" returnType="void">
<parameter index="1" type="flash.net::URLRequest" optional="false"/>
</method>
<method name="close" declaredBy="flash.net::URLLoader" returnType="void"/>
<variable name="dataFormat" type="String"/>
<variable name="bytesLoaded" type="uint"/>
<method name="dispatchEvent" declaredBy="flash.events::EventDispatcher"
returnType="Boolean">
<parameter index="1" type="flash.events::Event" optional="false"/>
</method>
<method name="toString" declaredBy="flash.events::EventDispatcher"
returnType="String"/>
