摘要： http://help.arcgis.com/en/webapi/flex/samples/index.html<Mapping>---->Switching Basemaps<?xmlversion="1.0"encoding="utf-8"?><s:Applicationxmlns:fx="http://ns.adobe.com/mxml/2009"xmlns:s="library://ns.adobe.com/flex/spark"xmlns:esri="http 阅读全文