easyui多选与接收不一致解决方案

附代码：

function batchRefund(){
    	  if(editIndex != undefined) {
	      		$('#refundList').datagrid('endEdit', editIndex);
	      	}
          $('#refundList').datagrid('acceptChanges');
          var json = $('#refundList').datagrid('getData');
          var arr = [];
          $.each(json.rows, function(index, data){
        	  if($("input[type='checkbox']").eq(index + 1).prop('checked') == true) {
        		  console.log(data);
        		  arr.push(data);
        	  }
          })
          console.log(JSON.stringify(arr))
          if (arr.length>0) {
              $.messager.confirm('消息提示', '确认要批量还款吗？', function(r){
                  if (r){
                	  $.ajax({
                          type: "post",
                          url: "${webRoot}/loanManage/batchRefund.do",
                          data:{
                          	rows:JSON.stringify(arr)	//将rows数组转化为字符串，否则经过jquery的深度改造之后数据会发生改变
                          },
                          dataType: "json",
                          success: function(data){
                               if(data.success==true){
                                    $('#refundList').datagrid('reload');
                                    $('#refundList').datagrid('unselectAll');
                                    alert("还款成功");
                               }else{
                                    //alert("还款失败");
                                    alert(data.msg);
                               }
                          }
                      });
                  }
              });
            }else{
            $.messager.show({
               title:'错误提示',
               msg:'请选择需要还款的列',
               timeout:5000,
               showType:'slide'
             });
            }

      }

　　查询列表及双击编辑代码：

$('#refundList').datagrid({
	  	    iconCls:'icon-edit',//图标
	  	    //width: 700,
	  	    //height: 1000,
	  	    nowrap: false,
	  	    striped: true,
	  	    border: true,
	  	    collapsible:false,//是否可折叠的
	  	    fit: true,//自动大小
	  	    url:'${webRoot}/loanManage/refundList.do',
	  	    //sortName: 'code',
	  	    //sortOrder: 'desc',
	  	    remoteSort:false,
	  	    idField:'id',
	  	    singleSelect:false,//是否单选
	  	    pagination:true,//分页控件
	  	    rownumbers:true,//行号
	  	  	pageSize: 20,
	  	  	pageList: [10,20,50],
	  	  	frozenColumns:[[
	                      {field:'ck',checkbox:true}
	                  ]],
            onDblClickRow: function(rowIndex, rowData){
            	if(editIndex != undefined && editIndex != rowIndex) {
            		$('#refundList').datagrid('endEdit', editIndex);
            	}
            	editIndex = rowIndex;
        		$('#refundList').datagrid('selectRow', rowIndex).datagrid('beginEdit', rowIndex);
        	}
	  	});