从子对象的对象列表中检索外键

Question

我正在使用fetch来检索一个json文件。json文件返回一个对象列表。每个对象也有一个对象。我正在尝试对外部对象进行控制台日志。以下是该文件的内容。从下面的数据中，我尝试记录这个列表'CNDNET'，'Acropolis'，'Other‘。如果我使用Object.keys(data)，我会得到一个整数0,1,2的列表。谢谢。

[
   {
      "CNDNET":{
         "application":[
            {
               "Elastic":[
                  "Missing Data",
                  "No Data/Data Feed Down",
                  "Content/Feature Request",
                  "Access Issue"
               ]
            },
            {
               "Kibana":[
                  "Website Access Issue",
                  "Access Issue",
                  "Site Down"
               ]
            },
            {
               "Logstash":[
                  "Missing Data",
                  "No Data/Data Feed Down",
                  "Content/Feature Request",
                  "Access Issue"
               ]
            },
            {
               "Kafka":[
                  "Missing Data",
                  "No Data/Data Feed Down",
                  "Content/Feature Request",
                  "Access Issue"
               ]
            },
            {
               "Phoenix":[
                  "Missing Data",
                  "No Data/Data Feed Down",
                  "Content/Feature Request",
                  "Access Issue"
               ]
            },
            {
               "Outlook":[
                  "Access Issue"
               ]
            },
            {
               "Domain Account":[
                  "Access Issue"
               ]
            },
            {
               "Token":[
                  "Access Issue"
               ]
            },
            {
               "Software":[
                  "Authenticate",
                  "Firefox",
                  "Swift"
               ]
            },
            {
               "Hardware":[
                  "Monitor",
                  "Printer"
               ]
            }
         ]
      }
   },
   {
      "Acropolis":{
         "application":[
            {
               "ACT":[
                  "Missing Data",
                  "No Data/Data Feed Down",
                  "Content/Feature Request",
                  "Access Issue"
               ]
            },
            {
               "ARTEMIS":[
                  "Missing Data",
                  "No Data/Data Feed Down",
                  "Content/Feature Request",
                  "Access Issue"
               ]
            }
         ]
      }
   },
   {
      "Other":{
         "application":[
            {
               "CMIS":[
                  "Website Access Issue",
                  "Other",
                  "Access Issue"
               ]
            },
            {
               "SharePoint":[
                  "Access Issue",
                  "Other"
               ]
            },
            {
               "GTMS":[
                  "Access Issue",
                  "Other"
               ]
            },
            {
               "Other":[
                  "Other"
               ]
            }
         ]
      }
   }
]

Answer 1

实际上，顶级data数组中包含三个对象。您可以使用flatMap()遍历这些元素，返回每个元素的Object.keys()。

​

const data = [{ "CNDNET": { "application": [{ "Elastic": ["Missing Data", "No Data/Data Feed Down", "Content/Feature Request", "Access Issue"] }, { "Kibana": ["Website Access Issue", "Access Issue", "Site Down"] }, { "Logstash": ["Missing Data", "No Data/Data Feed Down", "Content/Feature Request", "Access Issue"] }, { "Kafka": ["Missing Data", "No Data/Data Feed Down", "Content/Feature Request", "Access Issue"] }, { "Phoenix": ["Missing Data", "No Data/Data Feed Down", "Content/Feature Request", "Access Issue"] }, { "Outlook": ["Access Issue"] }, { "Domain Account": ["Access Issue"] }, { "Token": ["Access Issue"] }, { "Software": ["Authenticate", "Firefox", "Swift"] }, { "Hardware": ["Monitor", "Printer"] }] } }, { "Acropolis": { "application": [{ "ACT": ["Missing Data", "No Data/Data Feed Down", "Content/Feature Request", "Access Issue"] }, { "ARTEMIS": ["Missing Data", "No Data/Data Feed Down", "Content/Feature Request", "Access Issue"] }] } }, { "Other": { "application": [{ "CMIS": ["Website Access Issue", "Other", "Access Issue"] }, { "SharePoint": ["Access Issue", "Other"] }, { "GTMS": ["Access Issue", "Other"] }, { "Other": ["Other"] }] } }]

const dataKeys = data.flatMap(o => Object.keys(o));

console.log(dataKeys);

​

正如我在评论中提到的，直接在data数组上调用Object.keys()只返回数组的整数索引。(0,1,2)

Answer 2

您可以遍历数组，返回键并将其存储在变量中。稍后使用concat()或flat()方法将2D数组转换为1D数组，示例如下所示。

let result = arr.map((item) => {
  return Object.keys(item)
})

console.log(result.flat())
console.log([].concat(...result))