数据格式化
Flex内置格式化组件

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
   backgroundColor="#FFFFFF" width="500" height="280">

  <mx:DateFormatter id="dateFormatShort" formatString="MM/DD/YY"/>
  <mx:DateFormatter id="dateFormatMedium" formatString="MMM DD, YY"/>
  <mx:DateFormatter id="dateFormatFull" formatString="MMMM DD, YYYY"/>

 <mx:Panel title="Simple Formatter"
  layout="horizontal" width="100%" height="100%">
    <mx:DateChooser id="cal" />
   
    <mx:VBox>
     <mx:Label text="{cal.selectedDate}"/>
      <mx:Label text="{dateFormatShort.format(cal.selectedDate)}"/>
      <mx:Label text="{dateFormatMedium.format(cal.selectedDate)}"/>
      <mx:Label text="{dateFormatFull.format(cal.selectedDate)}"/>
  </mx:VBox>
   
 </mx:Panel>
</mx:Application>

当格式化组件出现错误信息时
当无错误时，error属性返回空字符串，当出错时返回Invalid Data

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
   backgroundColor="#FFFFFF">

  <mx:Script>
    <![CDATA[
    [Bindable]
    public var results:String="";
    public function formatNow():void {
      phoneFormatter.format(phone.text);
      // Check value of error property
      if(phoneFormatter.error == "Invalid value"){
       // append error to results
        results+=phoneFormatter.error+" - "+ phone.text + "<br/>";
      } else {
       // append to results
        results+="Valid Phone Number - "+phoneFormatter.format(phone.text) + "<br/>";
        // format original TextInput
        phone.text=phoneFormatter.format(phone.text);
      }
    }
    ]]>
  </mx:Script>

  <mx:PhoneFormatter id="phoneFormatter"
    formatString="(###) ###-####" validPatternChars="#-() "/>

  <mx:Panel title="Formatter Error Example" width="300" height="300"
    paddingTop="10" paddingLeft="10" paddingRight="10" paddingBottom="10">

  <mx:HBox>
    <mx:Label text="Phone number:" />
    <mx:TextInput id="phone" width="75%" change="formatNow()" restrict="0-9()-."/>
  </mx:HBox>
  <mx:TextArea id="formatterResults" htmlText="{results}" width="100%" height="100%" editable="false"/>
  </mx:Panel>
</mx:Application>