如何访问JavaScript内的json对象内的嵌套值 [英] how to access nested values inside json object inside javascript

问题描述

我有这个URL返回给我一个JSON值，我的任务是访问3个值，即名称，标题和ISBN。

由于内容大量嵌套，我无法访问其中的值。

到目前为止，我所提到的所有教程都有简单的嵌套功能。

我附上我的代码我已经写了：

$（document）.ready（function（）{
变种globalJsonVar;
警报（ 检查）;
$ .getJSON（https://openlibrary.org/api/books?bibkeys=ISBN:9781606868829&jscmd=details&format=json ），function（result）{
if（Object.keys（result）.length> 0）{
alert（conetnt is present）;
console.log（result）;
alert（Object.values（result））;
alert（result.ISBN：9781606868829. bib_key）; //我尝试访问值
} else {
alert（ 骗局）;
}
}）;
}）;


我收到的JSON内容是

  {
ISBN：9780143039648：{
bib_key：ISBN：9780143039648 ，
preview：noview，
preview_url：https://openlibrary.org/books/OL17924003M/The_guide，
info_url：https：/ /openlibrary.org/books/OL17924003M/The_guide，
details：{
number_of_pages：196，
系列：[
企鹅经典
 $ blc_classifications：[
PR9499.3.N3 G85 2006
，
latest_revision：7，
uri_descriptions： [
贡献者履历信息，
发布者描述
，
流派：[
虚构。 
，
title：The guide，
languages：[{
key：/ languages / eng
}]]， 
科目：[
Malgudi（India：Imaginary place） -  Fiction。，
导游（人物） - 小说。，
Bharata natyam舞蹈家 - 小说，
精神生活 - 印度教 - 小说，
印度 - 虚构。 
]，
publish_country：nyu，
by_statement：RK Narayan; Michael Gorra介绍。，
type：{
 key：/ type / edition
}，
uris：[
http://www.loc.gov/catdir/enhancements/fy0716/2006044314-b。 html，
http://www.loc.gov/catdir/enhancements/fy0716/2006044314-d.html
，
revision：7，
 publishers：[
Penguin Books
]，
dewey_decimal_class：[
823 / .914
，
last_modified ：{
type：/ type / datetime，
value：2012-08-05T21：10：58.887826
}，
key ：/ books / OL17924003M，
authors：[{
name：Rasipuram Krishnaswamy Narayan，
key：/ authors / OL5911201A
 }]，
publish_places：[
纽约
]，
oclc_number：[
65644730
 ]，
分页：xxiv，196 p。 ;，
created：{
type：/ type / datetime，
value：2008-10-07T19：30：19.584308
 }，
url：[
http://www.loc.gov/catdir/enhancements/fy0716/2006044314-b.html，
http：// www。 loc.gov/catdir/enhancements/fy0716/2006044314-d.html
，
注释：{
type：/ type / text，
 价值：最初出版：纽约：维京出版社，1958年。包括书目参考资料（第[xxi] -xxii）。
}，
标识符：{ 
goodreads：[
129877
]，
librarything：[
6930
] 
}，
isbn_13：[
9780143039648
]，
lccn：[
2006044314
]，
isbn_10 ：[
0143039644
]，
publish_date：2006，
works：[{
key：/ works / OL105 7183W
] 
} 
} 
} 
  

解决方案

  result.ISBN：9781606868829.bib_key 
  

是语法错误。 ：在这里是不允许的。您想使用以下语法：

  result [ISBN：9781606868829]。bib_key 
  

I have this URL which returns me a JSON value, my task is to access 3 values out of it that is name, title and ISBN.

Since the content is heavily nested, I am not able to access the values inside it.

All the tutorials I have referred so far, have simple nesting in them

I have attached my code that I have written so far:

$(document).ready(function() {
  var globalJsonVar;
  alert("check");
  $.getJSON("https://openlibrary.org/api/books?bibkeys=ISBN:9781606868829&jscmd=details&format=json", function(result) {
    if (Object.keys(result).length > 0) {
      alert("conetnt is present");
      console.log(result);
      alert(Object.values(result));
      alert(result.ISBN: 9781606868829. bib_key); // my attempt at accessing the values
    } else {
      alert("hoax");
    }
  });
});

The JSON content that I am receiving is

{
  "ISBN:9780143039648": {
    "bib_key": "ISBN:9780143039648",
    "preview": "noview",
    "preview_url": "https://openlibrary.org/books/OL17924003M/The_guide",
    "info_url": "https://openlibrary.org/books/OL17924003M/The_guide",
    "details": {
      "number_of_pages": 196,
      "series": [
        "Penguin classics"
      ],
      "lc_classifications": [
        "PR9499.3.N3 G85 2006"
      ],
      "latest_revision": 7,
      "uri_descriptions": [
        "Contributor biographical information",
        "Publisher description"
      ],
      "genres": [
        "Fiction."
      ],
      "title": "The guide",
      "languages": [{
        "key": "/languages/eng"
      }],
      "subjects": [
        "Malgudi (India : Imaginary place) -- Fiction.",
        "Tour guides (Persons) -- Fiction.",
        "Bharata natyam dancers -- Fiction.",
        "Spiritual life -- Hinduism -- Fiction.",
        "India -- Fiction."
      ],
      "publish_country": "nyu",
      "by_statement": "R.K. Narayan ; introduction by Michael Gorra.",
      "type": {
        "key": "/type/edition"
      },
      "uris": [
        "http://www.loc.gov/catdir/enhancements/fy0716/2006044314-b.html",
        "http://www.loc.gov/catdir/enhancements/fy0716/2006044314-d.html"
      ],
      "revision": 7,
      "publishers": [
        "Penguin Books"
      ],
      "dewey_decimal_class": [
        "823/.914"
      ],
      "last_modified": {
        "type": "/type/datetime",
        "value": "2012-08-05T21:10:58.887826"
      },
      "key": "/books/OL17924003M",
      "authors": [{
        "name": "Rasipuram Krishnaswamy Narayan",
        "key": "/authors/OL5911201A"
      }],
      "publish_places": [
        "New York"
      ],
      "oclc_number": [
        "65644730"
      ],
      "pagination": "xxiv, 196 p. ;",
      "created": {
        "type": "/type/datetime",
        "value": "2008-10-07T19:30:19.584308"
      },
      "url": [
        "http://www.loc.gov/catdir/enhancements/fy0716/2006044314-b.html",
        "http://www.loc.gov/catdir/enhancements/fy0716/2006044314-d.html"
      ],
      "notes": {
        "type": "/type/text",
        "value": "Originally published: New York : Viking Press, 1958.\n\nIncludes bibliographical references (p. [xxi]-xxii)."
      },
      "identifiers": {
        "goodreads": [
          "129877"
        ],
        "librarything": [
          "6930"
        ]
      },
      "isbn_13": [
        "9780143039648"
      ],
      "lccn": [
        "2006044314"
      ],
      "isbn_10": [
        "0143039644"
      ],
      "publish_date": "2006",
      "works": [{
        "key": "/works/OL1057183W"
      }]
    }
  }
}

解决方案

result.ISBN:9781606868829.bib_key

is a syntax error. : is not allowed here. You want to use the following syntay :

result["ISBN:9781606868829"].bib_key

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