flex 验证码

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="" xmlns="*"     layout="vertical" creationComplete="initApp()">
<mx:states>
     <!--新建“index”State-->
   <mx:State name="index">
      <!--移除“登录框”-->
    <mx:RemoveChild target="{panel1}"/>
    <!--添加新的组件-->
    <mx:AddChild position="lastChild">
     <mx:Label x="231" y="174" text="欢迎来到主页" fontFamily="Georgia" fontSize="20" />
    </mx:AddChild>
   </mx:State>
</mx:states>
<mx:Script>
   <![CDATA[
   import mx.controls.Alert;
   private function initApp():void{
   lblCheckCode.text=GenerateCheckCode();
   }
   private function loginHandle():void{
     if(txtUsername.text=="" || txtPassword.text==""){
      Alert.show("用户名或者密码输入不完整！");
     }
     if(txtUsername.text=="licui"&& txtPassword.text=="123" && txtCheckCode.text.toLocaleLowerCase()==lblCheckCode.text.toLocaleLowerCase()){
      currentState="index";
     }else{
      if(txtCheckCode.text.toLocaleLowerCase()!=lblCheckCode.text.toLocaleLowerCase()){
       Alert.show("验证码不正确:");
       lblCheckCode.text=GenerateCheckCode();
      }else{
       Alert.show("用户名或者密码输入不正确!");
     }
    }
    }
   private function resetHandle():void{
     txtUsername.text="";
     txtPassword.text="";
     txtCheckCode.text="";
    }
   private function GenerateCheckCode():String{
   var ran:Number;
   var number:Number;
   var code:String;
   var checkcode:String="";
   //生成四为随机数
   for(var i:int=0;i<4;i++){
      ran=Math.random();
      number=Math.round(ran*1000);
      if(number%2==0)
      code=String.fromCharCode(48+(number%10));
   else
   code=String.fromCharCode(65+(number%26));
   checkcode+=code;
   }
  
    return checkcode;
    }
   ]]>
</mx:Script>
<mx:Panel x="108" y="71" width="349" height="257" layout="absolute" title="用户登录" fontFamily="Georgia" fontSize="12" id="panel1">
   <!-- "用户名"标签 -->
   <mx:Label x="41.5" y="33" text="用户名"/>
   <!-- "密码"标签 -->  
   <mx:Label x="42.5" y="81" text="密码"/>
   <!-- "用户名"输入框 -->   
   <mx:TextInput x="94.5" y="33" id="txtUsername"/>
   <!-- "密码"输入框 -->
   <mx:TextInput x="95.5" y="81" id="txtPassword" displayAsPassword="true"/>
   <!-- "登录"按钮 -->
   <mx:Button x="82.5" y="159" label="登录" id="btnLogin" click="loginHandle()"/>
        <!-- "重置"按钮 -->
   <mx:Button x="181.5" y="159" label="重置" id="btnReset" click="resetHandle()"/>
   <!-- "校验码"标签 -->
   <mx:Label x="165.5" y="125" id="lblCheckCode" width="42.5" color="#377CD0"/>
   <mx:LinkButton x="216" y="123" label="看不清楚?" id="linkbtnReGenerate" click="lblCheckCode.text=GenerateCheckCode();" fontFamily="Georgia" fontSize="11"/>
   <mx:Label x="39.5" y="123" text="校验码"/>
   <!-- "校验码"输入框 -->
   <mx:TextInput x="96.5" y="121" id="txtCheckCode" width="61" maxChars="4"/>
</mx:Panel>
</mx:Application>

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