extjs4.1 grid panel

  Ext.define('gridState',{
        extend: 'Ext.data.Model',
   fields: [{name:'zbID',mapping:'zbID'},'gwID','bkhr','zbmc','dfsj','dftjlx','zycd','mbms','dfbz','sjms','df','dfsj','dfr','lddfms','shbz','shjy','shsj','shrxm','dfzt']
  });
 pageVar.gridStore = Ext.create('Ext.data.Store', {
   model: 'gridState',
    proxy: {
           //異步獲取數據，這裏的URL可以改爲任何動態頁面，只要返回JSON數據即可
            type: 'ajax',
            url: '/jxkh/app/jsp/jxkh_dafen_Mr.jsp?fg=2',
            reader: {
                type: 'json',
                root: 'items'
              }
           },
            autoLoad: true
   });
 
 pageVar.mainPanel = Ext.create('Ext.grid.Panel',{
  region:'center',
        store: pageVar.gridStore,
        columns: [
            {text:"ID",dataIndex:'zbID',align:'center',sortable:true,hidden:true},
   {text:"崗位ID",dataIndex:'gwID',align:'center',sortable:true,hidden:true},
   {text:"被考覈人",dataIndex:'bkhr',align:'center',sortable:true,width:100},
   {text:"指標名稱",dataIndex:'zbmc',align:'center',sortable:true,width:230},
   {text:"得分時間",dataIndex:'dfsj',align:'center',sortable:true,width:100},
   {text:"得分統計類型",dataIndex:'dftjlx',align:'center',sortable:true},
   {text:"重要程度",dataIndex:'zycd',align:'center',sortable:true},
   {text:"目標描述",dataIndex:'mbms',align:'center',sortable:true,hidden:true},
   {text:"得分比重",dataIndex:'dfbz',align:'center',sortable:true},
   {text:"實級描述",dataIndex:'sjms',align:'center',sortable:true,hidden:true},
   {text:"得分",dataIndex:'df',align:'center',sortable:true,renderer:formatScore},
   {text:"打分時間",dataIndex:'dfsj',align:'center',sortable:true},
   {text:"打分人",dataIndex:'dfr',align:'center',sortable:true},
   {text:"領導打分描述",dataIndex:'lddfms',align:'center',sortable:true,hidden:true},
   {text:"審覈標誌",dataIndex:'shbz',align:'center',sortable:true,hidden:true},
   {text:"審覈建議",dataIndex:'shjy',align:'center',sortable:true,hidden:true},
   {text:"審覈時間",dataIndex:'shsj',align:'center',sortable:true,hidden:true},
   {text:"審覈人姓名",dataIndex:'shrxm',align:'center',sortable:true,hidden:true},
   {text:"得分狀態",dataIndex:'dfzt',align:'center',sortable:true,renderer:formatState}
        ],
        title: '打分指標',
        viewConfig: {
            stripeRows: true
        } ,
       listeners: {
             dblclick: {
                      element: 'body', //bind to the underlying el property on the panel
                      fn: function(){
                          var msg='';
        var msg1='';
        var msg2='';
        var zbid='';
        var zbName='';
        var zbscore='';
                          var roww=pageVar.mainPanel.getSelectionModel().getSelection();
                          for(var i=0;i<roww.length;i++){
                            zbid=zbid+roww[i].get('zbID');
                            zbName=zbName+roww[i].get('zbmc');
                               msg=msg+roww[i].get('mbms');//應該綁定mbms
          msg1=msg1+roww[i].get('sjms');//應該綁定sjms
          msg2=msg2+roww[i].get('lddfms');//應該綁定lddfms
          zbscore=zbscore+roww[i].get('df');
          Ext.getCmp('zbid').setValue(zbid);
          Ext.getCmp('tgtName').setValue(zbName);
                               Ext.getCmp('tgtD').setValue(msg);
          Ext.getCmp('trueD').setValue(msg1);
          Ext.getCmp('lddfDetail').setValue(msg2);
          Ext.getCmp('score').setValue(zbscore);
                             }
                       }
                      }
                }
    }) ;

----------------------------------------------返回的json串---------------------

 private void zbInfoJSON(RSTable rs,HttpServletResponse resp){
      PrintWriter out = null;
   StringBuffer sb = new StringBuffer();
   try
   {
    out = resp.getWriter();
    out.println("{");
    sb.append("{");
          out.println("items:[");
    sb.append("items:[");
     
    if(rs != null && rs.getRowCount() > 0)
    {
     for(int i = 0; i < rs.getRowCount(); i++)
     {
      out.print("{");
      sb.append("{");
      out.print("'zbID' :'" + rs.getStringValue(i,0) + "',");
      sb.append("'zbID':'" + rs.getStringValue(i, 0) + "',");
      out.print("'bkhr' :'" + rs.getStringValue(i, 1) + "',");
      sb.append("'bkhr':'" + rs.getStringValue(i, 1) + "',");
      out.print("'gwID':'" + rs.getStringValue(i, 2) + "',");
      sb.append("'gwID':'" + rs.getStringValue(i, 2) + "',");
      out.print("'zbmc':'" + rs.getStringValue(i, 3)+ "',");
      sb.append("'zbmc':'" + rs.getStringValue(i, 3) + "',");
      out.print("'dftjlx':'" + rs.getStringValue(i, 4)+ "',");
      sb.append("'dftjlx':'" + rs.getStringValue(i, 4) + "',");
      out.print("'zycd':'" + rs.getStringValue(i, 5)+ "',");
      sb.append("'zycd':'" + rs.getStringValue(i, 5) + "',");
      out.print("'mbms':'" + rs.getStringValue(i, 6)+ "',");
      sb.append("'mbms':'" + rs.getStringValue(i, 6) + "',");
      out.print("'dfbz':'" + rs.getDoubleValue(i, 7)+ "'");
      sb.append("'dfbz':'" + rs.getDoubleValue(i, 7) + "'");
      out.print("}");
      sb.append("}");
      if(i != rs.getRowCount() - 1)
      {
       out.print(",");
       sb.append(",");
      }
     }
    }
    out.println("]");
    sb.append("]");
    out.println("}");
    sb.append("}");
   }
   catch(IOException e)
   {
    out.print("]");
    sb.append("]");
    e.toString();
   }
   System.out.println(sb.toString());
     }