显示ArrayCollection指定的某一项.

getItemAt()方法.
示例：

代码：

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/05/10/displaying-specific-items-from-an-arraycollection-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:ArrayCollection id="arrColl">
        <mx:source>
            <mx:Array>
                <mx:Object label="Student A" score="85" />
                <mx:Object label="Student B" score="48" />
                <mx:Object label="Student C" score="71" />
                <mx:Object label="Student D" score="88" />
                <mx:Object label="Student E" score="24" />
                <mx:Object label="Student F" score="64" />
                <mx:Object label="Student G" score="76" />
                <mx:Object label="Student H" score="76" />
                <mx:Object label="Student I" score="93" />
                <mx:Object label="Student J" score="88" />
                <mx:Object label="Student K" score="48" />
                <mx:Object label="Student L" score="76" />
            </mx:Array>
        </mx:source>
    </mx:ArrayCollection>

    <mx:ApplicationControlBar dock="true">
        <mx:HSlider id="slider"
                minimum="0"
                maximum="{arrColl.length-1}"
                liveDragging="true"
                snapInterval="1"
                tickInterval="1"
                dataTipPlacement="right" />
    </mx:ApplicationControlBar>

    <mx:Label text="{arrColl.getItemAt(slider.value).label}" />

</mx:Application>

或者：

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/05/10/displaying-specific-items-from-an-arraycollection-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:ArrayCollection id="arrColl">
        <mx:source>
            <mx:Array>
                <mx:Object label="Student A" score="85" />
                <mx:Object label="Student B" score="48" />
                <mx:Object label="Student C" score="71" />
                <mx:Object label="Student D" score="88" />
                <mx:Object label="Student E" score="24" />
                <mx:Object label="Student F" score="64" />
                <mx:Object label="Student G" score="76" />
                <mx:Object label="Student H" score="76" />
                <mx:Object label="Student I" score="93" />
                <mx:Object label="Student J" score="88" />
                <mx:Object label="Student K" score="48" />
                <mx:Object label="Student L" score="76" />
            </mx:Array>
        </mx:source>
    </mx:ArrayCollection>

    <mx:ApplicationControlBar dock="true">
        <mx:HSlider id="slider"
                minimum="0"
                maximum="{arrColl.length-1}"
                liveDragging="true"
                snapInterval="1"
                tickInterval="1"
                dataTipPlacement="right"
                change="lbl.text = arrColl[event.value].label;" />
    </mx:ApplicationControlBar>

    <mx:Label id="lbl" />

</mx:Application>