Easyui数据网格的单元格合并

$('#dg').datagrid({
    url: '',
    queryParams: formToObject('.searchBox'),
    columns: [[
        {field: 'itemid', title: '养护单位', align: 'center'},
        {field: 'productid', title: '类型', align: 'center'},
        {field: 'one', title: '1',  width: 40,align: 'center'},
        {field: 'twn', title: '2', width: 40, align: 'center'},
        {field: 'three', title: '3', width: 40,align: 'center'},
        {field: 'four', title: '4', width: 40,align: 'center'},
        {field: 'zf', title: '最终得分',width: 100, align: 'center'}
    ]],
    onLoadSuccess: function (data) {
        if (data.rows.length > 0) {
            let i;
            var mergezf= [];
            for (i = 0; i < data.rows.length; i++) {
                if (i % 2 == 0) {
                    let ite = {};
                    ite.index = i;
                    ite.rowspan =2;
                    mergezf.push(ite);
                }
            }
            for(i = 0; i<mergezf.length; i++){
                $('#dg').datagrid('mergeCells', {
                    index: mergezf[i].index,
                    field: 'zf',
                    rowspan: mergezf[i].rowspan
                });
            }
        }
    }
});