检查API响应并显示错误消息或成功消息

Question

我有这段代码

    SELECT a.customer_name ,
       a.unit ,
       sum(a.price) - sum(b.price) AS "highest revenue" ,
       rank() over (partition BY a.unit
                    ORDER BY sum(a.price) - sum(b.price) DESC) AS "Rank"
FROM
  (SELECT customer_name ,
          unit ,
          price
   FROM table1
   WHERE booked BETWEEN '12/01/15' AND '12/31/15') a
JOIN
  (SELECT customer_name ,
          unit ,
          price
   FROM table1
   WHERE booked BETWEEN '11/01/15' AND '11/30/15') b ON a.unit = b.unit
GROUP BY a.customer_name,
         a.unit
ORDER BY a.unit,
         sum(a.price) - sum(b.price) DESC, rank() over (partition BY a.unit ORDER BY sum(a.price) - sum(b.price) DESC) DESC

问题：检查API响应是否为false如果API响应为真则显示错误消息div继续下一步。

Answer 1

$.ajax({
                type: "POST"
                , url: url
                , data: JSON.stringify(Login)
                , contentType: "application/json",
                , success: function (resdata) {
                    if (resdata == null || resdata == '') {
                        // handle this error case
                    } else if (resdata == 'true') {
                        // handle true case
                    } else if (resdata == 'false') {
                        // handle false case
                    } 
                }
                , error: function () {
                    // handle error case
                }
            });

你可以通过返回＆＃34; true / false＆＃34;来处理。来自API响应。