Extjs的Grid合并列头 ->转载。挺有用的2
Ext.onReady(function(){
    Ext.BLANK_IMAGE_URL="../../../../../resources/images/default/s.gif";
    var GroupHeaderGrid = function() {
        GroupHeaderGrid.superclass.constructor.call(this, {
            title: '表头合并范例',
            renderTo : "groupHeaderGrid",
            height : 200,
            store: new Ext.data.SimpleStore({
                fields: ['name', 'sex', 'position', 'record', 'university', 'middleSchool', 'primarySchool'],
                data: [['张三','男','项目经理','本科','XX大学','XX中学','XX小学'],
                       ['李四','男','技术总监','硕士','XX大学','XX中学','XX小学'],
                       ['刘虹','女','技术架构师','专科','XX大学','XX中学','XX小学']]
            }),
            colModel: new Ext.grid.ColumnModel({
                columns: [
                    {header: "姓名", width: 120,  dataIndex: 'name'},
                    {header: "性别", width: 120,  dataIndex: 'sex'},
                    {header: "职位", width: 120,  dataIndex: 'position'},
                    {header: "学历", width: 120,  dataIndex: 'record'},
                    {header: "就读大学", width: 120,  dataIndex: 'university'},
                    {header: "就读中学", width: 120,  dataIndex: 'middleSchool'},
                    {header: "就读小学", width: 120,  dataIndex: 'primarySchool'}
                ],
                defaultSortable: true,
                rows: [[
                        {},
                        {},
                        {},
                        {},
                        {he