Code
<link rel="stylesheet" type="text/css" href="../resources/css/ext-all.css"/>
<script type="text/javascript" src="../adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="../ext-all.js"></script>
<script type="text/javascript" src="../src/locale/ext-lang-zh_CN.js"></script>
<script type="text/javascript">
 Ext.onReady(function(){
         var _window = new Ext.Window({
                 title:"测试窗体",
                 width:300,
                
                 layout:"form",
                  plain:true,
                 buttonAlign:"center",
                 items:[{
                        xtype:"textfield",
                        fieldLabel:"姓名"
                        },
                        {
                         xtype:"textfield",
                         fieldLabel:"密码"}
                        ],
                 buttons:[{
                          text:"确定",
                          handler:function(){
                              var cll = this.ownerCt.items;
                               //var temp = "";
                             
                              // temp += "姓名是" + cll.first().getValue();
                              // temp += "密码是" + cll.itemAt(1).getValue();
                              alert(cll.first().getValue());
                              }
                          }]
                });            
         _window.show();
        });
</script>

</head>