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我們?cè)僭囈幌芦@取實(shí)例的信息 :

var sprite1:Sprite = new Sprite();
var instanceInfo:XML = describeType(sprite1);

返回 :

代碼拷貝框
<type name="flash.display::Sprite" base="flash.display::DisplayObjectContainer" isDynamic="false" isFinal="false" isStatic="false"> <extendsClass type="flash.display::DisplayObjectContainer"/> <extendsClass type="flash.display::InteractiveObject"/> <extendsClass type="flash.display::DisplayObject"/> <extendsClass type="flash.events::EventDispatcher"/> <extendsClass type="Object"/> <implementsInterface type="flash.display::IBitmapDrawable"/> <implementsInterface type="flash.events::IEventDispatcher"/> <accessor name="hitArea" access="readwrite" type="flash.display::Sprite" declaredBy="flash.display::Sprite"/> <method name="startDrag" declaredBy="flash.display::Sprite" returnType="void"> <parameter index="1" type="Boolean" optional="true"/> <parameter index="2" type="flash.geom::Rectangle" optional="true"/> </method> <accessor name="buttonMode" access="readwrite" type="Boolean" declaredBy="flash.display::Sprite"/> <accessor name="graphics" access="readonly" type="flash.display::Graphics" declaredBy="flash.display::Sprite"/> <accessor name="soundTransform" access="readwrite" type="flash.media::SoundTransform" declaredBy="flash.display::Sprite"/> <method name="stopDrag" declaredBy="flash.display::Sprite" returnType="void"/> <accessor name="dropTarget" access="readonly" type="flash.display::DisplayObject" declaredBy="flash.display::Sprite"/> <accessor name="useHandCursor" access="readwrite" type="Boolean" declaredBy="flash.display::Sprite"/> <method name="getChildAt" declaredBy="flash.display::DisplayObjectContainer" returnType="flash.display::DisplayObject"> <parameter index="1" type="int" optional="false"/> </method> <method name="addChild" declaredBy="flash.display::DisplayObjectContainer" returnType="flash.display::DisplayObject"> <parameter index="1" type="flash.display::DisplayObject" optional="false"/> </method> <method name="swapChildren" declaredBy="flash.display::DisplayObjectContainer" returnType="void"> <parameter index="1" type="flash.display::DisplayObject" optional="false"/> <parameter index="2" type="flash.display::DisplayObject" optional="false"/> </method> <method name="getChildByName" declaredBy="flash.display::DisplayObjectContainer" returnType="flash.display::DisplayObject"> <parameter index="1" type="String" optional="false"/> </method> <method name="getObjectsUnderPoint" declaredBy="flash.display::DisplayObjectContainer" returnType="Array"> <parameter index="1" type="flash.geom::Point" optional="false"/> </method> <accessor name="textSnapshot" access="readonly" type="flash.text::TextSnapshot" declaredBy="flash.display::DisplayObjectContainer"/> <method name="removeChildAt" declaredBy="flash.display::DisplayObjectContainer" returnType="flash.display::DisplayObject"> <parameter index="1" type="int" optional="false"/> </method> <method name="getChildIndex" declaredBy="flash.display::DisplayObjectContainer" returnType="int"> <parameter index="1" type="flash.display::DisplayObject" optional="false"/> </method> <method name="areInaccessibleObjectsUnderPoint" declaredBy="flash.display::DisplayObjectContainer" returnType="Boolean"> <parameter index="1" type="flash.geom::Point" optional="false"/> </method> <accessor name="mouseChildren" access="readwrite" type="Boolean" declaredBy="flash.display::DisplayObjectContainer"/> <method name="removeChild" declaredBy="flash.display::DisplayObjectContainer" returnType="flash.display::DisplayObject"> <parameter index="1" type="flash.display::DisplayObject" optional="false"/> </method> <method name="setChildIndex" declaredBy="flash.display::DisplayObjectContainer" returnType="void"> <parameter index="1" type="flash.display::DisplayObject" optional="false"/> <parameter index="2" type="int" optional="false"/> </method> <method name="contains" declaredBy="flash.display::DisplayObjectContainer" returnType="Boolean"> <parameter index="1" type="flash.display::DisplayObject" optional="false"/> </method> <method name="addChildAt" declaredBy="flash.display::DisplayObjectContainer" returnType="flash.display::DisplayObject"> <parameter index="1" type="flash.display::DisplayObject" optional="false"/> <parameter index="2" type="int" optional="false"/> </method> <accessor name="numChildren" access="readonly" type="int" declaredBy="flash.display::DisplayObjectContainer"/> <method name="swapChildrenAt" declaredBy="flash.display::DisplayObjectContainer" returnType="void"> <parameter index="1" type="int" optional="false"/> <parameter index="2" type="int" optional="false"/> </method> <accessor name="tabChildren" access="readwrite" type="Boolean" declaredBy="flash.display::DisplayObjectContainer"/> <accessor name="tabEnabled" access="readwrite" type="Boolean" declaredBy="flash.display::InteractiveObject"/> <accessor name="doubleClickEnabled" access="readwrite" type="Boolean" declaredBy="flash.display::InteractiveObject"/> <accessor name="contextMenu" access="readwrite" type="flash.ui::ContextMenu" declaredBy="flash.display::InteractiveObject"/> <accessor name="accessibilityImplementation" access="readwrite" type="flash.accessibility::AccessibilityImplementation" declaredBy="flash.display::InteractiveObject"> <metadata name="Inspectable"> <arg key="environment" value="none"/> </metadata> </accessor> <accessor name="mouseEnabled" access="readwrite" type="Boolean" declaredBy="flash.display::InteractiveObject"/> <accessor name="focusRect" access="readwrite" type="Object" declaredBy="flash.display::InteractiveObject"/> <accessor name="tabIndex" access="readwrite" type="int" declaredBy="flash.display::InteractiveObject"/> <accessor name="mask" access="readwrite" type="flash.display::DisplayObject" declaredBy="flash.display::DisplayObject"/> <accessor name="scaleX" access="readwrite" type="Number" declaredBy="flash.display::DisplayObject"/> <accessor name="scaleY" access="readwrite" type="Number" declaredBy="flash.display::DisplayObject"/> <method name="getRect" declaredBy="flash.display::DisplayObject" returnType="flash.geom::Rectangle"> <parameter index="1" type="flash.display::DisplayObject" optional="false"/> </method> <accessor name="mouseY" access="readonly" type="Number" declaredBy="flash.display::DisplayObject"/> <accessor name="alpha" access="readwrite" type="Number" declaredBy="flash.display::DisplayObject"/> <accessor name="x" access="readwrite" type="Number" declaredBy="flash.display::DisplayObject"/> <accessor name="name" access="readwrite" type="String" declaredBy="flash.display::DisplayObject"/> <accessor name="y" access="readwrite" type="Number" declaredBy="flash.display::DisplayObject"/> <accessor name="root" access="readonly" type="flash.display::DisplayObject" declaredBy="flash.display::DisplayObject"/> <accessor name="width" access="readwrite" type="Number" declaredBy="flash.display::DisplayObject"/> <accessor name="stage" access="readonly" type="flash.display::Stage" declaredBy="flash.display::DisplayObject"/> <accessor name="loaderInfo" access="readonly" type="flash.display::LoaderInfo" declaredBy="flash.display::DisplayObject"/> <accessor name="transform" access="readwrite" type="flash.geom::Transform" declaredBy="flash.display::DisplayObject"/> <accessor name="height" access="readwrite" type="Number" declaredBy="flash.display::DisplayObject"/> <method name="localToGlobal" declaredBy="flash.display::DisplayObject" returnType="flash.geom::Point"> <parameter index="1" type="flash.geom::Point" optional="false"/> </method> <accessor name="filters" access="readwrite" type="Array" declaredBy="flash.display::DisplayObject"/> <accessor name="blendMode" access="readwrite" type="String" declaredBy="flash.display::DisplayObject"/> <accessor name="rotation" access="readwrite" type="Number" declaredBy="flash.display::DisplayObject"/> <method name="hitTestObject" declaredBy="flash.display::DisplayObject" returnType="Boolean"> <parameter index="1" type="flash.display::DisplayObject" optional="false"/> </method> <accessor name="scale9Grid" access="readwrite" type="flash.geom::Rectangle" declaredBy="flash.display::DisplayObject"/> <accessor name="accessibilityProperties" access="readwrite" type="flash.accessibility::AccessibilityProperties" declaredBy="flash.display::DisplayObject"/> <accessor name="scrollRect" access="readwrite" type="flash.geom::Rectangle" declaredBy="flash.display::DisplayObject"/> <accessor name="cacheAsBitmap" access="readwrite" type="Boolean" declaredBy="flash.display::DisplayObject"/> <method name="globalToLocal" declaredBy="flash.display::DisplayObject" returnType="flash.geom::Point"> <parameter index="1" type="flash.geom::Point" optional="false"/> </method> <method name="getBounds" declaredBy="flash.display::DisplayObject" returnType="flash.geom::Rectangle"> <parameter index="1" type="flash.display::DisplayObject" optional="false"/> </method> <accessor name="opaqueBackground" access="readwrite" type="Object" declaredBy="flash.display::DisplayObject"/> <accessor name="parent" access="readonly" type="flash.display::DisplayObjectContainer" declaredBy="flash.display::DisplayObject"/> <method name="hitTestPoint" declaredBy="flash.display::DisplayObject" returnType="Boolean"> <parameter index="1" type="Number" optional="false"/> <parameter index="2" type="Number" optional="false"/> <parameter index="3" type="Boolean" optional="true"/> </method> <accessor name="visible" access="readwrite" type="Boolean" declaredBy="flash.display::DisplayObject"/> <accessor name="mouseX" access="readonly" type="Number" declaredBy="flash.display::DisplayObject"/> <method name="willTrigger" declaredBy="flash.events::EventDispatcher" returnType="Boolean"> <parameter index="1" type="String" optional="false"/> </method> <method name="removeEventListener" declaredBy="flash.events::EventDispatcher" returnType="void"> <parameter index="1" type="String" optional="false"/> <parameter index="2" type="Function" optional="false"/> <parameter index="3" type="Boolean" optional="true"/> </method> <method name="toString" declaredBy="flash.events::EventDispatcher" returnType="String"/> <method name="addEventListener" declaredBy="flash.events::EventDispatcher" returnType="void"> <parameter index="1" type="String" optional="false"/> <parameter index="2" type="Function" optional="false"/> <parameter index="3" type="Boolean" optional="true"/> <parameter index="4" type="int" optional="true"/> <parameter index="5" type="Boolean" optional="true"/> </method> <method name="dispatchEvent" declaredBy="flash.events::EventDispatcher" returnType="Boolean"> <parameter index="1" type="flash.events::Event" optional="false"/> </method> <method name="hasEventListener" declaredBy="flash.events::EventDispatcher" returnType="Boolean"> <parameter index="1" type="String" optional="false"/> </method> </type>
[Ctrl+A 全部選擇 然后拷貝]

所有的標(biāo)簽與之前 factory 標(biāo)簽中的內(nèi)容是一樣的

現(xiàn)在我們使用 describeType 來(lái)遍歷之前 Dummy 類中的元素

實(shí)例化:

var dummy:Dummy = new Dummy();

獲取實(shí)例信息:

var instanceInfo:XML = describeType(dummy);

把所有的屬性取出來(lái), 包括訪問(wèn)器和變量, 并且訪問(wèn)器不可為只寫:

var properties:XMLList = instanceInfo..accessor.(@access != "writeonly") + instanceInfo..variable;

此時(shí) properties 里就有所有的屬性名了. 最后我們遍歷這個(gè) XMLList

for each (var propertyInfo:XML in properties) {
   
    // 取出屬性名
    var propertyName:String = propertyInfo.@name;
   
    // 根據(jù)屬性名來(lái)訪問(wèn)
    trace(dummy[propertyName]);
}

這樣 dummy 就被 "遍歷" 出了~

完整代碼:

代碼拷貝框
var dummy:Dummy = new Dummy(); var instanceInfo:XML = describeType(dummy); var properties:XMLList = instanceInfo..accessor.(@access != "writeonly") + instanceInfo..variable; for each (var propertyInfo:XML in properties) { var propertyName:String = propertyInfo.@name; trace(dummy[propertyName]); }
[Ctrl+A 全部選擇 然后拷貝]

這樣我們可以專門寫一個(gè)類, 負(fù)責(zé)獲取類信息, 詳細(xì)見(jiàn)類中注釋
TypeDescriptor.as, 負(fù)責(zé)獲取信息

代碼拷貝框
package { import flash.utils.describeType; import flash.utils.getQualifiedClassName; import flash.utils.getDefinitionByName; /** * 使用 flash.utils.describeType 獲取類詳細(xì)信息并緩存 * @author kakera * */ public class TypeDescriptor { /** * 緩存已經(jīng)反射過(guò)了的對(duì)象 */ private static var typeCache:Object = new Object(); /** * 獲取類信息 * @param target 要獲取的目標(biāo)對(duì)象 * @return TypeDescriptorEntry 實(shí)例 * */ public static function describeType (target:*):TypeDescription { var className:String = getQualifiedClassName(target); /** * 檢查緩存中是否已經(jīng)有目標(biāo)對(duì)象項(xiàng), 如果有就返回緩存中的內(nèi)容 */ if (className in typeCache) return typeCache[className]; /** * 暫存屬性列表 */ var propertyNames:Array = []; /** * 獲取類信息, 如果傳入的是實(shí)例則獲取實(shí)例類型的類信息 */ var typeInfo:XML = flash.utils.describeType(target is Class ? target : getDefinitionByName(className) as Class); /** * 獲取類中所有的屬性和訪問(wèn)器 */ var properties:XMLList = typeInfo.factory..accessor.(@access != "writeonly") + typeInfo..variable; /** * 遍歷并存放到 propertyNames 中 */ for each (var propertyInfo:XML in properties) propertyNames.push(propertyInfo.@name); /** * 創(chuàng)建 TypeDescriptorEntry 的實(shí)例并把 propertyNames 等屬性丟進(jìn)去 */ var entry:TypeDescription = new TypeDescription(); entry.name = className; entry.properties = propertyNames; entry.typeInfo = typeInfo; /** * 緩存到 typeCache 中以便下次從緩存中讀取 */ typeCache[className] = entry; return entry; } /** * 靜態(tài)類無(wú)須實(shí)例化 * @return * */ public function TypeDescriptor () { } } }
[Ctrl+A 全部選擇 然后拷貝]

TypeDescription.as, 負(fù)責(zé)保存信息

代碼拷貝框
package { public class TypeDescription { /** * 類的屬性列表, 包括訪問(wèn)器 (accessor) 和變量 (variable) */ public var properties:Array; /* of String */ /** * 類名 */ public var name:String; /** * 由 flash.utils.describeType() 獲取的原始 XML 數(shù)據(jù) */ public var typeInfo:XML; public function TypeDescription () { } } }
[Ctrl+A 全部選擇 然后拷貝]

出處：藍(lán)色理想
責(zé)任編輯：moby

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