javascript - JSON 中未定义值的尝试/捕获失败 - JavaScript

Question

你好，我有一个脚本js，它连接一个api并接收一个json作为返回，然后插入数据库，但是当这个json有一个未定义值时，它会失败，它停止被遍历循环(for x in cards)，即使它位于try/catch内部。有什么建议吗？

注意:content[data][squads][0]["cards"][x]['assignees'][0]['fullname'] 的值未定义并插入，但此后脚本中断。

content = const content = await rawResponse.json();

data = var data = Object.keys(content);

squads = var squads = Object.keys(content[data]);

cards = var cards = Object.keys(content[data][squads][0]["cards"]);

index total = 184

failed to = 77

打印值(value)卡:

[
  '0',  '1',  '2',  '3',  '4',  '5',  '6',  '7',  '8',  '9',
  '10', '11', '12', '13', '14', '15', '16', '17', '18', '19',
  '20', '21', '22', '23', '24', '25', '26', '27', '28', '29',
  '30', '31', '32', '33', '34', '35', '36', '37', '38', '39',
  '40', '41', '42', '43', '44', '45', '46', '47', '48', '49',
  '50', '51', '52', '53', '54', '55', '56', '57', '58', '59',
  '60', '61', '62', '63', '64', '65', '66', '67', '68', '69',
  '70', '71', '72', '73', '74', '75', '76', '77', '78', '79',
  '80', '81', '82', '83', '84', '85', '86', '87', '88', '89',
  '90', '91', '92', '93', '94', '95', '96', '97', '98', '99',
  ... 85 more items
]

脚本:

    for (x in cards) {

        const parameters = [

            content[data][squads][0]["cards"][x]['identifier'],
            content[data][squads][0]["cards"][x]['title'],
            content[data][squads][0]["cards"][x]['description'],
            content[data][squads][0]["cards"][x]['status'],
            content[data][squads][0]["cards"][x]['priority'],
            content[data][squads][0]["cards"][x]['assignees'][0]['fullname'],
            content[data][squads][0]["cards"][x]['assignees'][0]['email'],
            content[data][squads][0]["cards"][x]['primaryLabels'],
            content[data][squads][0]["cards"][x]['secondaryLabel'],
            content[data][squads][0]["cards"][x]['swimlane'],
            content[data][squads][0]["cards"][x]['workstate'],
            content[data][squads][0]["cards"][x]['createdAt']

        ];

         res = await client.query(query, parameters);

         client.query(res, () => {

            try {

                console.log("Insert card: " + content[data]["squads"][0]["cards"][x]['title']);

            } catch (error) {

                console.error("Error: " + error + " - " + content[data]["squads"][0]["cards"][x]['title']);

            }

        })

    }

输出:

Index JSON: 76
Insert card: [WIN] Update version Windows
Index JSON: 77
Error - TypeError: Cannot read property 'fullname' of undefined - [LZ] Clean /tmp/
Insert card: [LZ] Clean /tmp/

Answer 1

将 try/catch 包裹在 for 循环的整个主体中。

for (x in cards) {
  try {
    const parameters = [

      content[data][squads][0]["cards"][x]['identifier'],
      content[data][squads][0]["cards"][x]['title'],
      content[data][squads][0]["cards"][x]['description'],
      content[data][squads][0]["cards"][x]['status'],
      content[data][squads][0]["cards"][x]['priority'],
      content[data][squads][0]["cards"][x]['assignees'][0]['fullname'],
      content[data][squads][0]["cards"][x]['assignees'][0]['email'],
      content[data][squads][0]["cards"][x]['primaryLabels'],
      content[data][squads][0]["cards"][x]['secondaryLabel'],
      content[data][squads][0]["cards"][x]['swimlane'],
      content[data][squads][0]["cards"][x]['workstate'],
      content[data][squads][0]["cards"][x]['createdAt']

    ];
    res = await client.query(query, parameters);
    ...
  } catch (Exception e) {
    console.error(`Couldn't insert card ${x}`);
  }
}