datagrid合并行列--并不能影响序号列内容...(formatter的锅.)

//datagrid组件.
$('#id_dailylist_dg').datagrid({
//url:'datagrid_data.json',
columns:[[
{field:'orderNum',title:'序号',width:'5%',align:'center',
formatter:function(value,row,index){return index+1;}},
{field:'TYPENAME',title:'类别名称',width:'10%',align:'center'},
{field:'YZ_CONTENT',title:'名称',width:'20%',align:'center'},
{field:'SPEC',title:'规格',width:'18%',align:'center'},
{field:'SELLNUM',title:'数量',width:'8%',align:'center'},
{field:'TOTALPRICE',title:'金额',width:'10%',align:'center'},
{field:'COSTTYPE',title:'费用类型',width:'7%',align:'center'}
]]
});

$.ajax({
type:'POST',
url: ctx+"dailyListInfo/queryDailyDetail.do",
data:{'adRegNum':adregnum,'date':date_str},
cache:false,
async:true,
dataType:'json',
success: function(result2)
{
if(!!result2 && result2.length > 0){
$('#id_dailylist_dg').datagrid("loadData", result2);
}
//$('#id_dailylist_dg').datagrid("loadData", result2);
$('#id_dailylist_dg').datagrid("appendRow",{orderNum: '汇总:',YZ_CONTENT: '1112222次'});
$('#id_dailylist_dg').datagrid("appendRow",{orderNum: '汇总',YZ_CONTENT: ''});

var rows = $('#id_dailylist_dg').datagrid("getRows");
console.log( rows.length-2 );
$('#id_dailylist_dg').datagrid('mergeCells', {
index: rows.length-2,
field: 'orderNum',
rowspan: 2,
colspan: 2
});
$('#id_dailylist_dg').datagrid('mergeCells', {
index: rows.length-2,
field: 'YZ_CONTENT',
rowspan: 2,
colspan: 5
});
console.log("rows.length", rows.length );

},error:function(result2)
{
}
});

//datagrid组件.
$('#id_dailylist_dg').datagrid({
//url:'datagrid_data.json',
columns:[[
{field:'orderNum',title:'序号',width:'5%',align:'center'},
{field:'TYPENAME',title:'类别名称',width:'10%',align:'center'},
{field:'YZ_CONTENT',title:'名称',width:'20%',align:'center'},
{field:'SPEC',title:'规格',width:'18%',align:'center'},
{field:'SELLNUM',title:'数量',width:'8%',align:'center'},
{field:'TOTALPRICE',title:'金额',width:'10%',align:'center'},
{field:'COSTTYPE',title:'费用类型',width:'7%',align:'center'}
]]
});

success: function(result2)
{
if(!!result2 && result2.length > 0){
$.each(result2, function(i,n){
n['orderNum'] = i+1;
});
$('#id_dailylist_dg').datagrid("loadData", result2);
}
//$('#id_dailylist_dg').datagrid("loadData", result2);
$('#id_dailylist_dg').datagrid("appendRow",{orderNum: '汇总:',YZ_CONTENT: '1112222次'});
$('#id_dailylist_dg').datagrid("appendRow",{orderNum: '汇总',YZ_CONTENT: ''});