我正在尝试循环返回从API请求返回的一些数据，其结构如下：
[ { kind: 'qpxexpress#tripOption',
saleTotal: 'USD107.70',
id: 'fANabOjuLoDMb9zppwbeXL002',
slice: [ [Object] ],
pricing: [ [Object] ] },
{ kind: 'qpxexpress#tripOption',
saleTotal: 'USD107.70',
id: 'fANabOjuLoDMb9zppwbeXL003',
slice: [ [Object] ],
pricing: [ [Object] ] },
{ kind: 'qpxexpress#tripOption',
saleTotal: 'USD107.70',
id: 'fANabOjuLoDMb9zppwbeXL001',
slice: [ [Object] ],
pricing: [ [Object] ] } ]
然而，我的for循环给了我一个类型错误，我很难调试。我错过了什么？
request(options)
.then(function (response) {
//.log(response.trips.tripOption)
let selects = 0
for(let i = 0; i < response.trips.tripOption.length; i++) {
if (response.trips.tripOption[i].selected) {
selects++
}
}
return selects
console.log('hello' + ' ' + selects)
})
.catch(function (err) {
console.log(err)
})
答案 0 :(得分：2)
你的代码段中DROP TABLE IF EXISTS my_table;
CREATE TABLE my_table
(priority VARCHAR(12) NOT NULL PRIMARY KEY
,total INT NOT NULL
);
INSERT INTO my_table VALUES
('west',1),
('north',0),
('south',2),
('east',0);
SELECT *
, CASE FIND_IN_SET(total,(SELECT GROUP_CONCAT(DISTINCT total ORDER BY total DESC) x FROM my_table))
WHEN 1 THEN 'active'
WHEN 2 THEN 'previous' END status
FROM my_table;
+----------+-------+----------+
| priority | total | status |
+----------+-------+----------+
| west | 1 | previous |
| north | 0 | NULL |
| south | 2 | active |
| east | 0 | NULL |
+----------+-------+----------+
UPDATE my_table SET total = 4 WHERE priority = 'west';
SELECT *
, CASE FIND_IN_SET(total,(SELECT GROUP_CONCAT(DISTINCT total ORDER BY total DESC) x FROM my_table))
WHEN 1 THEN 'active'
WHEN 2 THEN 'previous' END status
FROM my_table;
+----------+-------+----------+
| priority | total | status |
+----------+-------+----------+
| west | 4 | active |
| north | 0 | NULL |
| south | 2 | previous |
| east | 0 | NULL |
+----------+-------+----------+
收到了一个拼写错误，写了Line 6而不是tripOptions。
另外，tripOption之前应该console.log()。