消息拦截器(MessageInterceptors)
public class DeleteItemInterceptor {

[MessageInterceptor(type="com.bookstore.events.ShoppingCartDeleteEvent")]
public function interceptDeleteEvent (processor:MessageProcessor) : void {
var listener:Function = function (event:CloseEvent) : void {
if (event.detail == Alert.OK) {
processor.proceed();
}
};
Alert.show("Do you really want to delete this item?", "Warning",
Alert.OK | Alert.CANCEL, null, listener);
}

}