easyui扩展数据表格点击加号拓展

$(function(){
           $("#RepaymentInfoTab").datagrid({
                view: detailview,
             detailFormatter:function(index,row){
                     return '<div style="padding:2px"><table id="ddv-' + index + '"></table></div>';
                 },
            onExpandRow:function(index,row){
                var repaymentNum = row.repaymentNum;
                $('#ddv-'+index).datagrid({
                    url:'getSaleInfoData?repaymentNum=' + repaymentNum,
                    fitColumns:true,
                    singleSelect:true,
                    height:'auto',
                    columns:[[ 

                        {field:'salesNum1',title:'计划消费流水',width:20},
                        {field:'salesMoney1',title:'计划消费金额',width:20},
                        {field:'difference1',title:'差额（消费-还款）',width:20},
                        {field:'status1',title:'计划消费状态',width:20,formatter:function(value){
                            if (value == 1) {return '<span style=\"color:red\">初始化</span>'; }
                            if (value == 2) {return '<span style=\"color:blue\">消费完成</span>'; }
                            if (value == 3) {return '<span style=\"color:blue\">遗弃</span>'; }
                        }},
                        {field:'transNo1',title:'交易流水号',width:20},
                        {field:'sendDate1',title:'交易时间',width:20},
                        {field:'creaetetime1',title:'添加时间',width:20},
                    ]],
                    onResize:function(){
                        $('#RepaymentInfoTab').datagrid('fixDetailRowHeight',index);
                    },
                    onLoadSuccess:function(){
                        setTimeout(function(){
                            $('#RepaymentInfoTab').datagrid('fixDetailRowHeight',index);
                        },0);
                    }
                });
                $('#RepaymentInfoTab').datagrid('fixDetailRowHeight',index);
            }
           })
     })