关于ext的分页有关问题 请高人指点多谢

关于ext的分页问题 请高人指点谢谢
代码:

HTML code

 <link rel="stylesheet" type="text/css" 
 href="../ext/resources/css/ext-all.css" /> 
  <script type="text/javascript" src="../ext/adapter/ext/ext-base.js"> </script> 
  <script type="text/javascript" src="../ext/ext-all.js"> </script> 
  <script type="text/javascript" src="../examples.js"> </script> 
  <script> 
  
 function renderSex(value){ 
         if(value == 'male'){ 
         return " <span style='color:red;font-weight:bold;'>男 </>" 
         } 
         else{ 
         if(value == 'female'){ 
         return " <span style='color:blue'>女 </>" 
         } 
         return " <span style='color:green;font-weight:lighter'>人妖 </>" 
         } 
         } 
  
 function renderDescn(value, cellmeta, record, rowIndex, columnIndex, store) { 
     var str = " <input type='button' value='查看详细信息' onclick='alert(\"" + 
         "这个单元格的值是：" + value + "\\n" + 
         "这个单元格的配置是：{cellId:" + cellmeta.cellId + ",id:" + cellmeta.id + ",css:" + cellmeta.css + "}\\n" + 
         "这个单元格对应行的record是：" + record + "，一行的数据都在里边\\n" + 
         "这是第" + rowIndex + "行\\n" + 
         "这是第" + columnIndex + "列\\n" + 
      "这个表格对应的Ext.data.Store在这里：" + store + "，随便用吧。" + 
         "\")'>"; 
     return str; 
 } 
  
 Ext.onReady(function(){ 
  
 var sm = new Ext.grid.CheckboxSelectionModel(); 
  
     var cm = new Ext.grid.ColumnModel([ 
     new Ext.grid.RowNumberer(), 
     sm, 
         {header:'编号',dataIndex:'id',sortable:true}, 
         {header:'名称',dataIndex:'name',sortable:true}, 
         {header:'性别',dataIndex:'sex',renderer:renderSex,sortable:true}, 
         {header:'描述',dataIndex:'descn',renderer:renderDescn,sortable:true} 
     ]); 
  
     var data = [ 
         ['1','name1','male','descn1'], 
         ['2','name2','male','descn2'], 
         ['3','name3','female','descn3'], 
         ['4','name4','descn4'], 
         ['5','name5','female','descn5'] 
     ]; 
  
     var ds = new Ext.data.Store({ 
         proxy: new Ext.data.HttpProxy({url:'grid.jsp?start=0&linit=10'}), 
         reader: new Ext.data.ArrayReader({}, [ 
             {name: 'id'}, 
             {name: 'name'}, 
             {name: 'sex'}, 
             {name: 'descn'} 
         ]) 
     }); 
     ds.load();  
 
  
 var grid = new Ext.grid.GridPanel({ 
      el: 'grid', 
      ds: ds, 
      cm: cm, 
      sm: sm, 
       
      bbar: new Ext.PagingToolbar({ 
      pageSize: 2, 
      store: ds, 
      displayInfo: true, 
      displayMsg: "显示 {0} - {1} 条的数据，一共 {2} 条", 
      afterPageText: "页,共{0}页", 
      emptyMsg: "没有数据", 
      prevText: "上一页", 
      nextText: "下一页", 
      firstText: "第一页", 
      refreshText: "刷新" 
           }), 
            
      tbar: new Ext.PagingToolbar({ 
             pageSize: 2, 
             store: ds, 
             displayInfo: true, 
             displayMsg: "显示 {0} - {1} 条的数据，一共 {2} 条", 
      afterPageText: "页,共{0}页", 
             emptyMsg: "没有数据" 
         }),      
             
      height:150, 
      width:500 
 }); 
  
 grid.render(); 
 ds.load({parmas:{start:0,limit:2}}); 
  
 }); 
  </script> 
  <div id='grid' style='height:256px;'> 
  
  </div> 
  
 

这个是jsp的页面 

HTML code

<%   String start=request.getParameter("start");   String limit=request.getParameter("limit");   try{        int index = 0;        int pageSize = 10;                if(start == null){            start = "0";        }         if(limit == null){            limit = "10";        }      index=Integer.parseInt(start);       pageSize=Integer.parseInt(limit);       String json = "{totalProperty:100,root:[";     for (int i = index; i < pageSize + index; i++) {         json += "{id:" + i + ",name:'name" + i + "',descn:'descn" + i + "'}";         if (i != pageSize + index - 1) {             json += ",";         }     }     json += "]}";     System.out.println(json);     response.getWriter().write(json);         }catch(Exception e){       e.printStackTrace();   }finally{      response.getWriter().close();  } %>

这个是显示出来的数据 
{totalProperty:100,root:[{id:0,name:'name0',descn:'descn0'},{id:1,name:'name1',descn:'descn1'},{id:2,name:'name2',descn:'descn2'},{id:3,name:'name3',descn:'descn3'},{id:4,name:'name4',descn:'descn4'},{id:5,name:'name5',descn:'descn5'},{id:6,name:'name6',descn:'descn6'},{id:7,name:'name7',descn:'descn7'},{id:8,name:'name8',descn:'descn8'},{id:9,name:'name9',descn:'descn9'}]}


页面没有报错 但是一天数据都没有 
请高手指点谢谢



[解决办法]

JScript code

reader: new Ext.data.JsonReader({root:"root",[            {name: 'id'},            {name: 'name'},            {name: 'sex'},            {name: 'descn'}        ]})
[解决办法]
JScript code
reader: new Ext.data.JsonReader({                fields: fields,                root: 'root',                totalProperty: 'totalProperty'            })