extjs4.2里还有没有columnModel?我想做动态加载表格，就是列会变化的。

Extrequire(['']);
ExtonReady(function () {
var data = [{}];
var data2 = [{OFF_PERIOD:'2013-09',QUOTANO:'YS1100',QUOTANAME:'&nbsp&nbsp&nbsp&nbsp主营业务收入',},{OFF_PERIOD:'2013-09',QUOTANO:'YS1200',QUOTANAME:' 通信服务收入'}];
var varItems =[{
text: '指标ID',
//width: 200,
sortable: false,
hidden: false,
dataIndex: 'QUOTANO'
}, {
text: '指标名称',
//width: 200,
sortable: false,
hidden: false,
dataIndex: 'QUOTANAME'
}, {
text: '数据ID',
//width: 200,
sortable: false,
hidden: false,
dataIndex: 'QUOTAVALUENO'
}, {
text: '数据名称',
//width: 200,
sortable: false,
hidden: false,
dataIndex: 'QUOTAVALUENAME'
}, {
text: '本部',
//width: 200,
sortable: false,
hidden: false,
dataIndex: 'BENBU',
field: {
xtype: 'numberfield'
}
}, {
text: '济南',
//width: 200,
sortable: false,
hidden: false,
dataIndex: 'JINAN',
field: {
xtype: 'numberfield'
}
}];
var varItems2 =[{
text: '指标ID',
//width: 200,
sortable: false,
hidden: false,
dataIndex: 'QUOTANO'
}, {
text: '指标名称',
//width: 200,
sortable: false,
hidden: false,
dataIndex: 'QUOTANAME'
}];

var varfields =[
{ name: 'OFF_PERIOD', mapping: 'OFF_PERIOD', type: 'string' },
{ name: 'QUOTANO', mapping: 'QUOTANO', type: 'string' },
{ name: 'QUOTANAME', mapping: 'QUOTANAME', type: 'string' },
{ name: 'QUOTAVALUENO', mapping: 'QUOTAVALUENO', type: 'string' },
{ name: 'QUOTAVALUENAME', mapping: 'QUOTAVALUENAME', type: 'string' },
];

var varfields2 =[
{ name: 'OFF_PERIOD', mapping: 'OFF_PERIOD', type: 'string' },
{ name: 'QUOTANO', mapping: 'QUOTANO', type: 'string' },
{ name: 'QUOTANAME', mapping: 'QUOTANAME', type: 'string' }
];
var vardate = Extcreate('ExtformDateField', {
fieldLabel: '账期',
labelWidth: 50,
name: 'Off_period',
maxValue: new Date(),
value: new Date(),
format: 'Y-m'
});
var northPanel = Extcreate('ExtformPanel', {
region: 'north',
layout: {
columns: 3,
type: 'table'
},
height: 55,
title: '业务管理',
items: [
vardate,
{
xtype: 'button',
anchor: '100%',
width: 75,
text: '查询',
handler: function () {
var Store = Extcreate('ExtdataStore', {
fields:varfields2,
data: data2
});
centerPanelreconfigure(Store, varItems2); //定义grid的store和column
}
},
{
xtype: 'button',
anchor: '100%',
width: 75,
text: '查询2',
handler: function () {
var Store = Extcreate('ExtdataStore', {
fields:varfields,
data: data
});
centerPanelreconfigure(Store, varItems); //定义grid的store和column
}
}
]
});
var centerPanel = Extcreate('ExtgridPanel', {
region: 'center',
title: '业务管理',
height: 55,
columns:[]
});
Extcreate('ExtcontainerViewport', {
layout: 'border',
renderTo: ExtgetBody(),
items: [northPanel, centerPanel]
});
});

你采用的是layout布局是border 即 上north 下south 左left 右right 中center , 但你后两个panel的region一个是west，一个是center所以有问题，把west改为south,试试吧

listeners : {
            dblclick : {
                element : 'body',
                fn : function() {
                    var _record = smgetSelection();
                    scount = _recordlength;
                    if (scount == 0) {//未选择
                        ExtMsgalert('友情提示', '请选择！');
                        return false;
                    }
                   addTab(false);

}
            }
        },

 
-------------------
function addTab (closable) {
        ++index;
        tabsadd({
            title: 'New Tab ' + index,
            iconCls: 'tabs',
            html: 'Tab Body ' + index + '<br/><br/>' + ExtexamplebogusMarkup,
            closable: !!closable
        })show();
    }

ExtonReady(function() {
 
  var sm=new ExtgridCheckboxSelectionModel();
 
  var cm=[new ExtgridRowNumberer(),sm,
 
   {header:"编号", dataIndex:"id", width:65,hidden : true},
 
   {header:"名称", dataIndex:"name", width:65},
 
   {header:"路径", dataIndex:"url", width:65}
 
   ]
 
  var fd = ["id", "name", "url"];
 
  var store=new ExtdataJsonStore({
 
   fields:fd
 
  })
 
  var data=[{
 
     id:1,name:"xiao",url:"sssssssssss",sex:"male"
 
     }]
 
  var grid=new ExtgridGridPanel({
 
   sm:sm,
 
   columns:cm,
 
   store:store,
 
   width:500,
 
   height:400,
 
   tbar:[{
 
    text:"生成",
 
    icon:"images/icons/addpng",
 
    cls:"x-btn-text-icon",
 
    handler:function(){
 
     var res = {fields:[{name:"sex"}],columns:[{header:'性别',dataIndex:"sex",width:65}]};
 
     var columns = rescolumns;
 
     var fields = resfields;
 
     for (var i = 0; i < fieldslength; i++) {
 
      fdpush(fields[i]name);
 
      cmpush(columns[i]);
 
     }
 
     //重新绑定store及column
 
     ss=new ExtdataJsonStore({
 
       fields:fd
 
      });
 
     gridreconfigure(ss,new ExtgridColumnModel(cm));
  
     ssloadData(data)
 
    }
 
   }]
 
    
 
  })
 
   
 
  var win=new ExtWindow({
 
   title:"sssssss",
 
   width:700,
 
   height:500,
 
   layout:"fit",
 
   closable:true,
 
   items:[grid]
 
  })
 
  winshow();
 
});

主要是grid里的reconfigure这个方法：配置grid以使用一个不同的Store和Column Model并触发'reconfigure'事件。 视图将会被绑定到新的对象并刷新。

你自己引用ext3的类库吧~

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