getLocationObject.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
	<mx:Button label="hgoehoge" click="click(event)" />
	<mx:Script>
		<![CDATA[
			private function click(e:Event):void {
				if(ExternalInterface.available) {
					var location:Object = ExternalInterface.call("function(){return window.location;}");
					trace(location)
				}
			}
		]]>
	</mx:Script>
</mx:Application>