1、问题背景

一般的，需要对表格中某列的数值进行格式化，对该数值乘以100，并保留两位小数，添加“%”

2、实现实例

<?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 tempData:Number = item.rate*100; var data:String = dataFormatter.format(tempData); 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>

（1）将小数乘以100

var tempData:Number = item.rate*100;

（2）对数值格式化，保留两位小数

var data:String = dataFormatter.format(tempData);

（3）添加百分号

return data+"%";

3、实现结果