//调用WebService

			import mx.controls.Alert;

			import mx.rpc.events.ResultEvent;

			import mx.rpc.soap.WebService;  

			protected function getWebService():void

			{

				//Security.allowDomain("*");

				//Security.allowInsecureDomain("*");

				//Security.loadPolicyFile("http://localhost/crossdomain.xml");

				var ws :mx.rpc.soap.WebService = new mx.rpc.soap.WebService();

				ws.wsdl= "http://localhost/XXX/MyWebService.asmx?WSDL";

				ws.addEventListener(ResultEvent.RESULT,resultFunction);//增加返回结果的监听

				ws.getOperation("HelloWorld").send();

				//ws.getOperation("Sum").send("3","5"); //传递参数

				ws.loadWSDL();

			}  

			private function resultFunction(event:ResultEvent){

				var s:String =event.result as String;

				Alert.show(s.toString());

			}

<s:HGroup width="100%" verticalAlign="middle">

			<mx:Text id="resultweb"/>

			<common:Cbutton id="btn_call" label="调用webService" click="getWebService()"/>

		</s:HGroup>