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); 
            }
           })
     })