flex 在IE界面顯示當前地圖比例尺

<?xml version="1.0" encoding="utf-8"?>
<!--  監聽地圖縮放事件，顯示當前地圖比例尺  -->
<!-- Copyright (c) 2010-2011 《ArcGIS Server開發指南——基於Flex和.NET》練習代碼
完整的代碼工程可以從 http://www.geocommon.net 下載  -->
<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" 
  minWidth="755" minHeight="600" 
  xmlns:esri="http://www.esri.com/2008/ags">
<fx:Script>
<![CDATA[
import com.esri.ags.events.ZoomEvent;

protected function zoomEndHandler(event:ZoomEvent):void
{
labelScale.text = "1 : " + numFormater.format(map.scale);
}
]]>
</fx:Script>
<fx:Declarations>

<mx:NumberFormatter id="numFormater" precision="0" />
</fx:Declarations>

<esri:Map id="map" width="100%" height="100%" zoomEnd="zoomEndHandler(event)">
<esri:ArcGISDynamicMapServiceLayer 
url="http://localhost/ArcGIS/rest/services/USAMap/MapServer" />
</esri:Map>
<s:Label id="labelScale" top="20" horizontalCenter="0" 
fontSize="16" fontWeight="bold" backgroundColor="#ffffff" />
</s:Application>