datatables ajax row undefined

   读取json文件时，可以用row[2]这种方式，但是ajax则需要使用row.title这种方式：     

$('#example').DataTable( {
                "sAjaxSource": "/poptestcase?oid="+oid+"&tid="+tid,
                "bDestroy":true,
                "columns": [
                { "data": "wait" ,"render": function ( data, type, row ) {
                        if(parseInt(row.fail) > 0)
                        {
                        return '未通过';
                        }
                        else
                        {
                        if(parseInt(row.wait) > 0 || parseInt(row.stall) > 0)
                        {
                        return '处理中';
                        }
                        else
                        {
                        return '通过';
                        }
                        }
                        }},
                { "data": "pass" ,"visiblity":false},
                { "data": "fail","visiblity":false },
                { "data": "stall","visiblity":false },
                { "data": "invalid","visiblity":false },
                    { "data": "equipmentname" },
                    { "data": "equipmentbrand" },
                    { "data": "equipmentoperatingsystem" }
                ]
            });