1，需要引入的

<link rel="stylesheet" type="text/css" href="../../ext-3.2.1/resources/css/ext-all.css"/>

<script type="text/javascript" src="../../ext-3.2.1/adapter/ext/ext-base.js"></script>

<script type="text/javascript" src="../../ext-3.2.1/ext-all.js"></script>

2.js

<script type="text/javascript">

     

   Ext.onReady(function(){

   

    var combo = new Ext.form.ComboBox({

    

     emptyText:'请选择',

     mode:'local',

     width:100,

     triggerAction:'all',   

     transform:'workTypeName' , //下拉框id

     hiddenName:'workName'    //value提交到后台的值

    });

   

   });

   </script>

<select id="workTypeName" >

       <option value="_">--请选择--</option>

       <option value=""></option>

  </select>