JQuery EasyUI datagrid 复杂表头处理

            $('#day_health').datagrid({
                url: "sqb_bweb_day_health.aspx?mode=day_health",
                pagination: true,
                total: 2000,
                pageSize: 10,
                pageList: [10, 20, 30, 40, 50, 60, 70, 80, 90, 100],
                rownumbers: true,
                fit: true,        //自动大小
                fitColumns: true, //自适应列宽
                singleSelect: true,  //是否单选
                idField: 'Project_id',
                columns: [[
                    {title:'一组',colspan:3},
                    {field:'opt',title:'Operation',width:100,align:'center', rowspan:2,
                        formatter:function(value,rec){
                            return '<span style="color:red">Edit Delete</span>';
                        }
                    },
                    {title:'二组',colspan:3}
                ],[ 
                    {field:'name',title:'Name',width:120,rowspan:1},
                    {field:'addr',title:'Address',width:220,rowspan:1,sortable:true,
                        sorter:function(a,b){
                            return (a>b?1:-1);
                        }
                    },
                    {field:'col4',title:'Col41',width:150,rowspan:1},
                        {field:'name1',title:'Name1',width:120,rowspan:1},
                    {field:'addr1',title:'Address1',width:220,rowspan:1,sortable:true,
                        sorter:function(a,b){
                            return (a>b?1:-1);
                        }
                    },
                    {field:'col41',title:'Col411',width:150,rowspan:1}
                ]]
            });