EXT gridGroup

            Ext.define('Task', {
                extend: 'Ext.data.Model',
                idProperty: 'id',
                fields: [
                    { name: 'Customer_name', type: 'string' },
                    { name: 'Follow', type: 'string' },
                    { name: 'Follow_Type', type: 'string' },
                    { name: 'department_name', type: 'string' },
                    { name: 'employee_name', type: 'string' },
                    { name: 'Follow_date', type: 'date', dateFormat: 'Y-d-m' }
                ]
            });
            var store = Ext.create('Ext.data.Store', {
                model: 'Task',
                pageSize: 20, 
                remoteSort: false,
                remoteFilter: true,
                proxy: {
                    type: 'ajax',
                    url: '/data/customer/FollowHandler.ashx?action=personGrid',
                    reader: {
                        type: 'json', 
                        root: 'rows', 
                        totalProperty: 'total' 
                    }
                },
                sorters: [
                    {
                        property: 'id',
                        direction: 'desc'
                    }
                ],
                groupField: 'Customer_name',//分组
                autoLoad: true
            });

　　

var grid = Ext.create('Ext.grid.Panel', {
                id: 'PersonContactsList_grid',
                floatable: false,
                border: false,
                store: store,
                reload: true,
                bbar: pagebbar,
                title: '个人客户',
                features: [{//分组选项
                    id: 'persongroup',
                    ftype: 'groupingsummary',
                    groupHeaderTpl: '{name}',
                    hideGroupedHeader: true,
                    enableGroupingMenu: false,
                    startCollapsed: true
                }],
                columns: [{
                    text: '跟进内容',
                     600,
                    locked: true,
                    tdCls: 'task',
                    sortable: true,
                    dataIndex: 'Follow',
                    hideable: false,
                    summaryType: 'count',
                    summaryRenderer: function (value, summaryData, dataIndex) {//组内数量统计
                        return ((value === 0 || value > 1) ? '(' + value + ' 跟进)' : '(1 跟进)');
                    },
                    renderer: function (value, meta, record) {
                        return '<div style="white-space:normal;overflow: visible;">' + value + '</div>';
                    }
                },
                    {
                        text: "客户名称",
                         200,
                        dataIndex: 'Customer_name'
                    },
...............