Flex列在一个表格式的数字值

<?

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="100%" height="100%" fontSize="12"
fontFamily="微软雅黑">
<s:layout>
<s:BasicLayout/>
</s:layout>
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import mx.events.FlexEvent;

[Bindable]
//表格数据绑定
private var gridArray:ArrayCollection = new ArrayCollection([
{week:"星期一",apple:"3676",rate:"0.7868"},
{week:"星期二",apple:"4534",rate:"0.65454"},
{week:"星期三",apple:"6758",rate:"0.876454"},
{week:"星期四",apple:"9808",rate:"0.34224"},
{week:"星期五",apple:"6567",rate:"0.9876523"},
{week:"星期六",apple:"9000",rate:"0.566777"},
{week:"星期日",apple:"4533",rate:"0.988787"}
]);

/**
* 对表格中的比率进行格式化
*/
private function formatDataGrid(item:Object,column:DataGridColumn):String
{
var temp:Number = item.rate;
var data:String = dataFormatter.format(temp);
return data;
}

]]>
</fx:Script>
<fx:Declarations>
<!--格式化数字-->
<mx:NumberFormatter id="dataFormatter" precision="2" rounding="up"/>
</fx:Declarations>

<mx:VBox width="100%" height="100%" paddingBottom="10" paddingLeft="10" paddingRight="20"
paddingTop="10" horizontalAlign="center">
<mx:DataGrid id="dataGrid" width="100%" height="90%" dataProvider="{gridArray}" textAlign="center">
<mx:columns>
<mx:DataGridColumn headerText="星期" dataField="week"/>
<mx:DataGridColumn headerText="苹果" dataField="apple"/>
<mx:DataGridColumn headerText="比率" dataField="rate" labelFunction="formatDataGrid"/>
</mx:columns>
</mx:DataGrid>

</mx:VBox>
</s:Application>