flex中validateall()方法， 多Item验证 ，结果统一提示

<?xml version="1.0" encoding="utf-8"?>
<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="955" minHeight="600"
			   creationComplete="initHandler(event)">
	<fx:Script>
		<![CDATA[
			import mx.controls.Alert;
			import mx.events.FlexEvent;
			import mx.events.ValidationResultEvent;
			import mx.validators.Validator;

			private var error1:String;

			private var error2:String;

			private var error3:String;

			protected function initHandler(event:FlexEvent):void
			{

			}

			protected function btn_clickHandler(event:MouseEvent):void
			{
				// TODO Auto-generated method stub
				var validateArray:Array=Validator.validateAll(
					[NAMEValidator,AGEValidator,PHONEValidator]);
				if(validateArray.length==0)
				{
					Alert.show("成功啦！");
				}else
				{
                      Alert.show(error1+"\n"+error2+"\n"+error3);
				}
			}

			protected function NAMEValidator_invalidHandler(event:ValidationResultEvent):void
			{
				error1 =event.message;
			}

			protected function AGEValidator_invalidHandler(event:ValidationResultEvent):void
			{
				error2 =event.message;
			}

			protected function PHONEValidator_invalidHandler(event:ValidationResultEvent):void
			{
				error3 =event.message;
			}

		]]>
	</fx:Script>
	<fx:Declarations>
          <mx:StringValidator id="NAMEValidator"
			    source="{username}"
			    property="text"
				minLength="6" maxLength="16"
				tooLongError="不能多于16个字符"  tooShortError="不能低于六位"
				required="true"
				invalid="NAMEValidator_invalidHandler(event)"
			  />
		<mx:NumberValidator id="AGEValidator"  source="{age}"
			domain="int" allowNegative="false" maxValue="60" minValue="18"
			required="true" property="text"
			exceedsMaxError="不能大于60" lowerThanMinError="不能低于十八"
			invalid="AGEValidator_invalidHandler(event)"
							/>
		<mx:PhoneNumberValidator id="PHONEValidator"
			 minDigits="11" property="text"
			 source="{phone}"
			 required="true"
			 invalid="PHONEValidator_invalidHandler(event)"/>
	</fx:Declarations>
	<mx:Panel>
	   <mx:Form>
	     <mx:FormItem label="name">
			 <mx:TextInput  id="username"/>
		 </mx:FormItem>
		   <mx:FormItem label="age">
			   <mx:TextInput  id="age"/>
		   </mx:FormItem>
		   <mx:FormItem label="phone">
			   <mx:TextInput id="phone"/>
		   </mx:FormItem>
		   <mx:FormItem>
		      <mx:Button label="验证" id="btn" click="btn_clickHandler(event)"/>
		   </mx:FormItem>
	   </mx:Form>
	</mx:Panel>
</s:Application>