TypeError Error 1009 无法访问空对象引用的属性或方法

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1、错误描述

TypeError: Error #1009: 无法访问空对象引用的属性或方法。at FirstMap/search_clickHandler()[E:\Flash Builder\Map\src\FirstMap.mxml:17]at FirstMap/__search_click()[E:\Flash Builder\Map\src\FirstMap.mxml:30]

2、错误原因

<?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"       width="100%" height="100%" xmlns:chart="chart.*"> <s:layout>  <s:BasicLayout/> </s:layout> <fx:Script>  <![CDATA[   import mx.controls.Alert;      protected function search_clickHandler(event:MouseEvent):void   {    var teacher:Teacher = new Teacher();    var workId:String = teacher.workId.label;    Alert.show(workId);   }  ]]> </fx:Script> <fx:Declarations>  <!-- 将非可视元素（例如服务、值对象）放在此处 --> </fx:Declarations>  <mx:HBox width="100%" height="100%" paddingBottom="10" paddingLeft="10" paddingRight="20"    paddingTop="10">  <s:Panel width="50%" height="100%">   <s:Button id="search" label="查询" click="search_clickHandler(event)" width="100%"       height="100%" fontSize="320"/>  </s:Panel>  <chart:Teacher width="50%" height="100%"/> </mx:HBox> </s:Application>

        var workId:String = teacher.workId.label;  无法获取到Teacher模块中的workId的label值

     这里应用程序里调用模块中的参数

3、解决办法

（1）检查模块workId的label是否为空

（2）调试该ActionScript代码

     

           

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