表头合并

columns:[
    		[
    			{field:'bigarea',title:'大区',rowspan:2,width:$$.fillsize(0.1),align:'center'},
    			{field:'ProvinceName',title:'省份',rowspan:2,width:$$.fillsize(0.1),align:'center'},
    			{field:'dbct_name',title:'分拨中心',rowspan:2,width:$$.fillsize(0.1),align:'center'},
    			{field:'dbct_id',title:'分拨中心编码',rowspan:2,hidden:true},
    			{field:'stats_dt',title:'统计时间',rowspan:2,hidden:true},
    			{title:'揽件',colspan:5,align:'center'}
    		],[
                {field:'pick_ship_cnt',title:'票数',width:$$.fillsize(0.1),align:'center'},
                {field:'pick_cnt',title:'件数',width:$$.fillsize(0.1),align:'center'},
                {field:'pick_setl_wgt',title:'结算重量/吨',width:$$.fillsize(0.1),align:'center'},
                {field:'pick_actl_wgt',title:'实际重量/吨',width:$$.fillsize(0.1),align:'center'},
                {field:'pick_vol',title:'体积/方',width:$$.fillsize(0.1),align:'center'}
    		]
    	],

内容合并 

// 后端先获取查询数据List<Map>,再追加首行add(0,合计map);追加末行add(合计map);
// select '合计' as bigarea,sum(**) as pick_ship_cnt,......
    onLoadSuccess: function (data) {
	    //首尾行合计合并单元格，如果要操作的单元格比较多可以使用each循环，我这里只添加首位行合计，所以直接写的
        $("#shipmontTable").datagrid('mergeCells',{
            index: 0,       //行索引
			field:'bigarea',  //字段名
            rowspan: null,    //跨行
            colspan: 2        //跨列
        });
        var datarows = data.rows.length;
        $("#shipmontTable").datagrid('mergeCells',{
            index: datarows-1,
            field:'bigarea',
            rowspan: null,
            colspan: 2
        });
        //垂直合并单元格
        mergeCells(listId,"bigarea,ProvinceName,dbct_name");
    }
    

垂直合并公用方法

function mergeCells(tableID, colList) {
    var colArray = colList.split(",");
    var tTable = $("#" + tableID);
    var tableRows = tTable.datagrid("getRows");
    var tableRowCnts = tableRows.length;
    var rowspan;
    var preTxt = "";
    var curTxt = "";
    for (j = colArray.length - 1; j >= 0; j--) {
    	preTxt = "";
    	rowspan = 1;
        for (i = 0; i <= tableRowCnts; i++) {
            if (i == tableRowCnts) {
                curTxt = "";
            } else {
                curTxt = tableRows[i][colArray[j]];
            }
            if (preTxt == curTxt) {
            	rowspan += 1;
            } else {
                tTable.datagrid("mergeCells", {
                    index: i - rowspan,
                    field: colArray[j],//合并字段
                    rowspan: rowspan,
                    colspan: null
                });
                rowspan = 1;
            }
            preTxt = curTxt;
        }
    }
}