v1_06 理解命名空间
Understanding namespaces flex理解命名空间示例:ex5_08_solution?

<?xml version="1.0" encoding="utf-8"?><s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"     xmlns:s="library://ns.adobe.com/flex/spark"     xmlns:mx="library://ns.adobe.com/flex/mx"     width="980" height="690"    xmlns:components="components.*"     skinname="code"><?xml version="1.0" encoding="utf-8"?>

??2.xmlns:fx="http://ns.adobe.com/mxml/2009"?
xmlns:s="library://ns.adobe.com/flex/spark"?
xmlns:mx="library://ns.adobe.com/flex/mx"这三个URI只是一个名字,它对应的xml文件要从flex-config找(D:\Program Files\Adobe\Adobe Flash Builder 4\sdks\4.1.0\frameworks)

      <namespaces>      <!-- Specify a URI to associate with a manifest of components for use as MXML -->      <!-- elements.                                                                -->         <namespace>            <uri>http://ns.adobe.com/mxml/2009</uri>            <manifest>mxml-2009-manifest.xml</manifest>         </namespace>         <namespace>            <uri>library://ns.adobe.com/flex/spark</uri>            <manifest>spark-manifest.xml</manifest>         </namespace>         <namespace>            <uri>library://ns.adobe.com/flex/mx</uri>            <manifest>mx-manifest.xml</manifest>         </namespace>         <namespace>            <uri>http://www.adobe.com/2006/mxml</uri>            <manifest>mxml-manifest.xml</manifest>         </namespace>      </namespaces>

??看下这三个库的作用mx命名空间引用flex3的类,包括mx包和数据可视化组件?fx命名空间对flex4来说是新的,包括诸如对象,数据,布尔和阵列的顶层ActionScript语言元素还包括诸如脚本,声明和样式的内建编译器标签?s或Spark命名空间包含flex4可用的所有新的spark组件和文本框架类还可以为网络服务,http服务和来自spark命名空间的远程对象请求引用数据服务组件?另外xmlns:components="components.*"?? 用来指明自己定义的components自定义组件的使用:

 <components:EmployeePortalPanel title="Monthly Events"             panelTitleColor="#0D86B8">                        <components:MonthlyEvents/>                    </components:EmployeePortalPanel>

?例子中的<components:MonthlyEvents/> 就是一个自定义组件,名字与mxml的名字相同spark.effects.AddAction?(as文件) 内容如下----------------as和mxml的关系就像java与jsp.

package spark.effects{import flash.display.DisplayObjectContainer;import mx.core.IVisualElement;import mx.core.IVisualElementContainer;import mx.core.mx_internal;import spark.effects.supportClasses.AddActionInstance;import mx.effects.IEffectInstance;import mx.effects.Effect;import mx.effects.effectClasses.PropertyChanges;use namespace mx_internal;//--------------------------------------//  Excluded APIs//--------------------------------------[Exclude(name="duration", kind="property")]public class AddAction extends Effect{    include "../core/Version.as";

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