索引嵌套 JSON 数组

我有以下 JSON 示例，其中 "results" 下有一个数组，其中包含两个对象。它可以在 “results” 数组下包含数百个具有相同键和不同值的对象。

我无权更改此 JSON 文件。

{
  "results": [
    {
      "title": "Information Collection Requests; Direct Loan Servicing-Regular; and Servicing Minor Program Loans",
      "type": "Notice",
      "abstract": "In accordance with the Paperwork Reduction Act (PRA) requirement, the Farm Service Agency (FSA) is requesting comments from all interested individuals and organizations on a revision of two currently approved information collection requests, Direct Loan Servicing--Regular and Servicing Minor Program Loans, respectively. In the Direct Loan Servicing--Regular, the information is used to determine borrower compliance with loan agreements, assist the borrower in achieving business goals, and regular servicing of the loan account such as graduation, subordination, partial release, use of proceeds, and consent. In Servicing Minor Program Loans, the information collected is used to perform routine and special servicing actions for loans authorized and serviced under FSA's Minor Loan Program.",
      "document_number": "2023-05464",
      "html_url": "https://www.federalregister.gov/documents/2023/03/17/2023-05464/information-collection-requests-direct-loan-servicing-regular-and-servicing-minor-program-loans",
      "pdf_url": "https://www.govinfo.gov/content/pkg/FR-2023-03-17/pdf/2023-05464.pdf",
      "public_inspection_pdf_url": "https://public-inspection.federalregister.gov/2023-05464.pdf?1678970722",
      "publication_date": "2023-03-17",
      "agencies": [
        {
          "raw_name": "DEPARTMENT OF AGRICULTURE",
          "name": "Agriculture Department",
          "id": 12,
          "url": "https://www.federalregister.gov/agencies/agriculture-department",
          "json_url": "https://www.federalregister.gov/api/v1/agencies/12",
          "parent_id": null,
          "slug": "agriculture-department"
        },
        {
          "raw_name": "Farm Service Agency",
          "name": "Farm Service Agency",
          "id": 157,
          "url": "https://www.federalregister.gov/agencies/farm-service-agency",
          "json_url": "https://www.federalregister.gov/api/v1/agencies/157",
          "parent_id": 12,
          "slug": "farm-service-agency"
        }
      ],
      "excerpts": "In accordance with the Paperwork Reduction Act (PRA) requirement, the Farm Service Agency (FSA) is requesting comments from all interested individuals and organizations on a revision of two currently approved information collection requests, Direct..."
    },
    {
      "title": "Notice of Funding Opportunity for the Socially Disadvantaged Groups Grant for Fiscal Year 2023",
      "type": "Notice",
      "abstract": "This notice announces that the Rural Business-Cooperative Service (RBCS, Agency), a Rural Development (RD) agency of the United States Department of Agriculture (USDA), invites applications for grants under the Socially Disadvantaged Groups Grant (SDGG) program for Fiscal Year (FY) 2023. This notice is being issued to allow applicants sufficient time to leverage financing, prepare and submit their applications, and give the Agency time to process applications within FY 2023. A total of ,000,000 in grant funding will be available for FY 2023. Successful applications will be selected by the Agency for funding and subsequently awarded to the extent that funding may ultimately be made available through appropriations. All applicants are responsible for any expenses incurred in developing and submitting their applications.",
      "document_number": "2023-05441",
      "html_url": "https://www.federalregister.gov/documents/2023/03/17/2023-05441/notice-of-funding-opportunity-for-the-socially-disadvantaged-groups-grant-for-fiscal-year-2023",
      "pdf_url": "https://www.govinfo.gov/content/pkg/FR-2023-03-17/pdf/2023-05441.pdf",
      "public_inspection_pdf_url": "https://public-inspection.federalregister.gov/2023-05441.pdf?1678970718",
      "publication_date": "2023-03-17",
      "agencies": [
        {
          "raw_name": "DEPARTMENT OF AGRICULTURE",
          "name": "Agriculture Department",
          "id": 12,
          "url": "https://www.federalregister.gov/agencies/agriculture-department",
          "json_url": "https://www.federalregister.gov/api/v1/agencies/12",
          "parent_id": null,
          "slug": "agriculture-department"
        },
        {
          "raw_name": "Rural Business-Cooperative Service",
          "name": "Rural Business-Cooperative Service",
          "id": 456,
          "url": "https://www.federalregister.gov/agencies/rural-business-cooperative-service",
          "json_url": "https://www.federalregister.gov/api/v1/agencies/456",
          "parent_id": 12,
          "slug": "rural-business-cooperative-service"
        }
      ],
      "excerpts": "This notice announces that the Rural Business-Cooperative Service (RBCS, Agency), a Rural Development (RD) agency of the United States Department of Agriculture (USDA), invites applications for grants under the Socially Disadvantaged Groups Grant..."
    }
  ]
}

我有以下代码来获取并显示数组中每个键所需的值，如下所示：

const xmlhttp = new XMLHttpRequest();
xmlhttp.onload = function() {
  const myArr = JSON.parse(this.responseText);

  let text = "";
  for (let i in myArr.results) {
    text += "<div class='fed-reg-container'><h2 class='title'>" + myArr.results[i].title + "</h2><p>" + myArr.results[i].type + "</p><p>" + myArr.results[i].agencies[0].raw_name + " Document # " + myArr.results[i].document_number + "</p><p>Posted on: " + myArr.results[i].publication_date + "</p><p>" + myArr.results[i].abstract + "</p><a class='fed-reg-button' href='" + myArr.results[i].html_url + "'>Read More</a></div>";
  }
  text += "";
  document.getElementById("demo").innerHTML = text;
};
xmlhttp.open(
  "GET",
  "https://www.federalregister.gov/api/v1/documents.json?conditions%5Bagencies%5D%5B%5D=agriculture-department&conditions%5Bagencies%5D%5B%5D=federal-highway-administration&conditions%5Bagencies%5D%5B%5D=fish-and-wildlife-service&conditions%5Bagencies%5D%5B%5D=forest-service&conditions%5Bagencies%5D%5B%5D=interior-department&conditions%5Bagencies%5D%5B%5D=international-boundary-and-water-commission-united-states-and-mexico&conditions%5Bagencies%5D%5B%5D=land-management-bureau&conditions%5Bagencies%5D%5B%5D=national-highway-traffic-safety-administration&conditions%5Bagencies%5D%5B%5D=national-park-service&conditions%5Bagencies%5D%5B%5D=reclamation-bureau&conditions%5Bagencies%5D%5B%5D=environmental-protection-agency&conditions%5Bagencies%5D%5B%5D=council-on-environmental-quality&conditions%5Bagencies%5D%5B%5D=safety-and-environmental-enforcement-bureau&conditions%5Bagencies%5D%5B%5D=environment-office-energy-department&conditions%5Bcomment_date%5D%5Bgte%5D=05%2F01%2F2023&conditions%5Bcomment_date%5D%5Blte%5D=01%2F01%2F2050&conditions%5Bterm%5D=arizona&conditions%5Btype%5D%5B%5D=RULE&conditions%5Btype%5D%5B%5D=PRORULE&conditions%5Btype%5D%5B%5D=NOTICE",
  true
);
xmlhttp.send();

.fed-reg-container {
  background-color: black;
  color: white;
  padding: 20px;
  margin: 20px 0;
}

.title {
  color: #fcb900;
}

.fed-reg-button {
  background-color: #fcb900;
  color: black;
  padding: 10px;
  display: block;
  max-width: 100px;
  text-align: center;
  font-weight: 600;
  text-decoration: none;
}

<!DOCTYPE html>
<html>

<body>
  <p id="demo"></p>

</body>

</html>

一切都很好，除了一件事。

如您所见，我的 json 在 "agencies" 下有一个嵌套数组，其中包含多个对象。

我正在尝试使用索引来获取每个对象的 raw_name 下的每个值。

如果我使用 + myArr.results[i].agencies[0].raw_name 它适用于单个对象。可能是 [0] 或 [1]。

当我尝试获取第二个值（例如 + myArr.results[i].agencies[0].raw_name + " - " + myArr.results[i].agencies[1].raw_name 时，它会破坏整个代码。我没有得到任何回报。只是一个白页。

知道我做错了什么吗？

谢谢！

P粉311617763311 天前500

索引嵌套 JSON 数组

全部回复(1)我来回复

" + myArr.results[i].title + "