AJAX 请求没有收到我想要的属性

Question

我必须向以下 API 发送 AJAX 请求：https://jsonplaceholder.typicode.com/posts。然后按“标题”属性（升序）对结果进行排序并按 console.log

打印

这里的问题是我没有得到 title 属性，而是得到了很多这样的：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div>
        <h1>Getting Started With Fetch API</h1>
        <button id="fetchJsonData">Fetch User Data</button>
    </div>
    <hr>
    <div id="response"></div>
</body>
<script>
    document.getElementById('fetchJsonData').addEventListener('click', fetchJson);

    function fetchJson(){
        fetch('https://jsonplaceholder.typicode.com/posts')
            .then(response => response.json())
            .then(json => console.log(json))
    }
    document.getElementById('fetchJsonData').addEventListener('click', fetchJson);
    
        function fetchJson(){
            fetch('https://jsonplaceholder.typicode.com/posts')
                .then(response => response.json())
                .then(titles => {
                    let output = '<h2>Lists of Titles</h2>';
                    // output += '<ul>';
                    titles.forEach(function(titles) {
                        output += `
                            <li>
                                ${titles}
                            </li>
                        `;
                        output += '</ul>'
                    document.getElementById("response").innerHTML = output;
                    });
                    
                });
        }

        function sortList(ul) {
  var ul = document.getElementById(ul);

  Array.from(ul.getElementsByTagName("LI"))
    .sort((a, b) => a.textContent.localeCompare(b.textContent))
    .forEach(li => ul.appendChild(li));
}

sortList("response");
        
</script>
</html>

我访问数据的方式不对吗？请指教，提前致谢

Answer 1

在 forEach 循环中，${titles} 应该是 ${titles.title}

Answer 2

response是一个object数组，直接渲染需要获取title的字符串值

document.getElementById('fetchJsonData').addEventListener('click', fetchJson);

function fetchJson() {
  fetch('https://jsonplaceholder.typicode.com/posts')
    .then(response => response.json())
    .then(json => console.log(json))
}
document.getElementById('fetchJsonData').addEventListener('click', fetchJson);

function fetchJson() {
  fetch('https://jsonplaceholder.typicode.com/posts')
    .then(response => response.json())
    .then(titles => {
      let output = '<h2>Lists of Titles</h2>';
      output += '<ul>';
      titles.sort((a, b) => a.title.localeCompare(b.title)).forEach((obj) => {
        output += `<li>${obj.title}</li>`;
      });
      output += '</ul>';

      document.getElementById("response").innerHTML = output;
    });
}

<div>
  <h1>Getting Started With Fetch API</h1>
  <button id="fetchJsonData">Fetch User Data</button>
</div>
<hr>
<div id="response"></div>

Answer 3

这样操作。

阅读 docs 以获得更多见解 javascript。

document.getElementById('fetchJsonData')
    .addEventListener('click', fetchJson);

function fetchJson(){
            fetch('https://jsonplaceholder.typicode.com/posts')
                .then(response => response.json())
                .then(posts => {
                    let output = '<h2>Lists of Titles</h2>';
                    posts.sort((a, b) => a.title.localeCompare(b.title));
                    posts.forEach(function(post) {
                        output += `
                            <li>
                                ${post.title}
                            </li>
                        `;
                        output += '</ul>'
                    document.getElementById("response").innerHTML = output;
                    });
                    
                });
        }

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div>
        <h1>Getting Started With Fetch API</h1>
        <button id="fetchJsonData">Fetch User Data</button>
    </div>
    <hr>
    <div id="response"></div>
</body>
</html>

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