如何从嵌套JSON获取特定或多个值(或键) [英] How to get a specific or multiple values (or keys) from nested JSON

问题描述

我有一个(嵌套的)数据结构，其中包含对象和数组.如何提取信息，即访问特定或多个值(或键)?

I have a (nested) data structure containing objects and arrays. How can I extract the information, i.e. access a specific or multiple values (or keys)?

  {
    "data": [{
      "name": "name1",
      "value": "value1",
      "list": [{
        "sname": "sname1",
        "svalue": "svalue1"
      }, {
        "sname": "sname2",
        "svalue": "svalue2"
      }]
    }]
  }

jQuery

var pk = $("#pk").val();
console.log(pk);
url = "/register/search?id=" + pk;
console.log(url);
$('#largeTable').DataTable({
  "ajax": url,
  "bDestroy": true,
  "columns": [{
      "data": "name"
    },
    {
      "data": "value"
    },
    {
      "data": "list.1.sname"
    },
    {
      "data": "list.1.svalue"
    },
    {
      "data": null,
      "defaultContent": editview
    }
  ]
});

在这里可以使用list.1或list.0显示第一或第二个列表值

Here it is possible to display either first or second list values by using list.1 or list.0

但是我一次想要两个值.

But I want two values at a time.

还可以访问list中第二项的svalue吗?

Also, how could I access the svalue of the second item in list?

我尝试使用data.list[1]，但是:

TypeError:data.list未定义

TypeError: data.list is undefined

推荐答案

具体地说，您可以像object.data[0].list[1].svalue这样访问它. data.list是undefined的原因是因为data对应于数组data: [{ }]，这就是我们使用data[0]的原因，但是data本身是对象中的键，因此在进入data之前您需要访问它.如果data所在的对象名称是object (就像我在下面所做的那样)，则可以像这样object.data[0]

Specifically you can access it like this object.data[0].list[1].svalue. The reason data.list is undefined is because data corresponds to an array data: [{ }] this is why we use data[0], but data itself is a key in an object so before you can get to data you need to access it. If the objects name where data resides were object (like I did below) then it'd be accessed like this object.data[0]

const object = {
  "data": [{
    "name": "name1",
    "value": "value1",
    "list": [{
      "sname": "sname1",
      "svalue": "svalue1"
    }, {
      "sname": "sname2",
      "svalue": "svalue2"
    }]
  }]
}

console.log(object.data[0].list[1].svalue)

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