flex验证码生成

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<?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="initApp(event)">
   <fx:Library>
       <fx:Definition name="MYsq">
           <s:Group>
               <s:Rect width="100%" height="100%">
                   <s:stroke>
                       <s:SolidColorStroke color="red"/>
                   </s:stroke>
               </s:Rect>
           </s:Group>
       </fx:Definition>
   </fx:Library>
   <fx:Script>
       <![CDATA[
           import ascb.util.DateFormat;

           import mx.events.FlexEvent;
           import mx.formatters.DateFormatter;



           protected function initApp(event:FlexEvent):void
           {
               rail();
           }

           protected function rail():String
           {
//               var exp:Date = new Date(2013,5,30);
//               trace(DateFormat.DAYS[exp.month]);
//               var str:String = "\ti\tam\ta\ngirl.";
//               trace(str);
//               var str2:String = "djnfwojcvnwoejraok'Dkfawejfosdjfwenfljweiflnsjoeflsdkfnowejwsef";
//               var index:int = -1;
//               while((index = str2.indexOf("f",index+1))!=-1)
//               {
//                       trace("f在str2的第"+index);
//               }
//               var letters:Array = [14,45,10,1,125,4,87,2,1,57,25,5];
//               letters.sort(Array.NUMERIC);
//               trace(letters);
               //随机生成4位验证码
               var ran:Number;
               var num:Number;
               var code:String;
               var checkCode:String ="";
               for(var i:int=0;i<4;i++)
               {
                   ran = Math.random();
                   num = Math.round(ran*10000);
                   if(num%2==0)
                   {
                       //"0"的ascii码为48
                       code = String.fromCharCode(48+(num%10));
                   }
                   else
                   code = String.fromCharCode(65+(num%26));
                   checkCode+=code;
               }
               return checkCode;
           }

       ]]>
   </fx:Script>
   <fx:Declarations>
       
   </fx:Declarations>

</s:Application>