Flex综述

1. Flex表现层服务器包含Flex应用框架和Flex运行服务，Flex框架包含AS3语言、MXML和Flex类库。MXML界面语言，用于布局、描述行为效果等。AS3是FlashPlayer可以理解的编程语言，也是Flex应用的基础。AS是MXML的基础，可以完成MXML不能完成的任务。包括控制事件、绑定数据对象到Flex控件等。Flex类库提供了可扩展的组件，如容器和控件、数据绑定和行为等。建立Flex应用程序的步骤：1.用MXML实现设计和布局，用AS实现函数功能，编译，将SWF文件包装到HTML上。与传统的数据层、业务层、表现层不同的是Flex多了客户层，这使得Flex的客户可以脱离服务器工作不受网络限制，并且能与用户很好的交互。

2.MXML类似于HTML，但MXML是应用于FlashPlayer上运行的，同时MXML提供了更多动态的用户界面，使用MXML的好处是方便布局和定位。<mx:Application>是所有Flex应用程序的根标签，它定义了最基本的Application容器，容器是应用程序的组件，用来存放其他的容器。<mx:Label>定义一个标签控件，其中控件中还可以存放许多属性，属性用来初始化组件状态。一般来说MXML完成了MVC中的view部分，而AS则完成了model部分。Flex实际上是AS的库。大多数MXML标签都对应一个AS类，每个MXML标签的属性都对应AS对象的属性、格式和事件监听。虽然MXML异于布局但是在动态、数据处理等方面都受到限制，需要用AS语言来开发同时用AS来实现一些不可视的操作和事件处理。<mx:Binding>用来进行一些数据绑定工作<mx:Component>定义文件内部可视文件的主体<mx:Metadata>元数据标签，提供给Flex关于如何使用MXML组件的信息<mx:Script>用来插入AS代码。

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3.       数据绑定的方式有两种 ,MXML 方式： <fx:Binding source=”t1.text” destination=”t2.text”/> 把 t1 （ TextInput ）的文本值绑定到 t2 上。第二种：用 AS# 绑定， <fx:Script>[Bindable]</fx:Script> 即在 AS 里面定义方法，与 MXML 交互。用 bindable 声明然后与一个控件绑定。