如何在 JavaScript 中的键内显示 json 数据？

Question

我从 api 获取数据，该数据包含一个键，最后包含多个键，这是我的示例：

{
"status": 0,
"location": "Casablanca [Doukkala-Abda;Morocco]",
  "day": {
      "1": {
      "date": "20200807",
      "name": "Friday",
      "month": "", ...

父键是day

子键是1 , 2 , 3 ...等，它们包含数据

我尝试使用console.log(data['day']['1'])和console.log(data.day['1'])但我收到此错误： Cannot read property '1' of undefined

我该如何正确阅读？

Answer 1

索引为整数时只需使用数组形式即可，如：

 let data = { "day": { "1": { "date": "20200807" } } } console.log("data:", data); console.log('data.day["1"]:', data.day["1"]); console.log('data.day["1"].date:', data.day["1"].date);

Answer 2

您可能想要删除引号，例如： data.day[1]而不是data.day['1']

 var data = { "status": 0, "location": "Casablanca [Doukkala-Abda;Morocco]", "day": { "1": { "date": "20200807", "name": "Friday", "month": "" }, "2": { "date": "20200801", "name": "test", "month": "" } } } console.log(data.day[1]);

Answer 3

我认为问题是您需要首先使用JSON.parse()解析您的 API 响应，例如：

 let rawDataFromApi = '{"status":0,"location":"Casablanca [Doukkala-Abda;Morocco]","day":{"1":{"date":"20200807","name":"Friday","month":""}}}' let data = JSON.parse(rawDataFromApi) console.log(data['day']['1'])

Answer 4

.  operator can be used to get the data.the data is a object so that [] will not be a good idea. 

使用day.1.date获取数据

Answer 5

尝试这个。

 let data = { "day": { "1": { "date": "202008071" } } } let data2 = { "day": { "2": { "date": "202008072" } } } let data3 = { "day": { "third": { "date": "202008073" } } } console.log(data.day["1"].date); console.log(data2.day["2"].date); console.log(data3.day["third"].date);