freeCodeCamp/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/nest-many-elements-within-a-single-div-element.md

---
id: bad87fee1348bd9aede08835
title: 元素嵌套
challengeType: 0
videoUrl: 'https://scrimba.com/p/pVMPUv/cNW4kC3'
forumTopicId: 18246
dashedName: nest-many-elements-within-a-single-div-element
---

# --description--

`div` 元素也叫 Content Division Element（内容划分元素）元素，是一个包裹其他元素的通用容器。

它也是 HTML 中出现频率最高的元素。

和其他普通元素一样，你可以用 `<div>` 来标记一个 `div` 元素的开始，用 `</div>` 来标记一个 `div` 元素的结束。

# --instructions--

请把无序列表、有序列表和段落都嵌套进同一个 `div` 元素。

提示：你可以在第一个 `<p>` 之前插入 `div` 开始标记，在 `</ol>` 之后插入 `div` 结束标签。这样，所有的列表都会位于 `div` 之内。

# --hints--

所有的 `p` 元素都应嵌套在 `div` 元素中。

```js
assert($('div').children('p').length > 1);
```

所有的 `ul` 元素都应嵌套在 `div` 元素中。

```js
assert($('div').children('ul').length > 0);
```

所有的 `ol` 元素都应嵌套在 `div` 元素中。

```js
assert($('div').children('ol').length > 0);
```

`div` 元素应有结束标签。

```js
assert(
  code.match(/<\/div>/g) &&
    code.match(/<\/div>/g).length === code.match(/<div>/g).length
);
```

# --seed--

## --seed-contents--

```html
<h2>CatPhotoApp</h2>
<main>
  <p>Click here to view more <a href="#">cat photos</a>.</p>

  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>

  <p>Things cats love:</p>
  <ul>
    <li>cat nip</li>
    <li>laser pointers</li>
    <li>lasagna</li>
  </ul>
  <p>Top 3 things cats hate:</p>
  <ol>
    <li>flea treatment</li>
    <li>thunder</li>
    <li>other cats</li>
  </ol>

  <form action="https://freecatphotoapp.com/submit-cat-photo">
    <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor</label>
    <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
    <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving" checked> Loving</label>
    <label for="lazy"><input id="lazy" type="checkbox" name="personality" value="lazy"> Lazy</label>
    <label for="energetic"><input id="energetic" type="checkbox" name="personality" value="energetic"> Energetic</label><br>
    <input type="text" placeholder="cat photo URL" required>
    <button type="submit">Submit</button>
  </form>
</main>
```

# --solutions--

```html
<h2>CatPhotoApp</h2>
<main>
  <p>Click here to view more <a href="#">cat photos</a>.</p>
  
  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="A cute orange cat lying on its back."></a>
  <div>
    <p>Things cats love:</p>
    <ul>
      <li>cat nip</li>
      <li>laser pointers</li>
      <li>lasagna</li>
    </ul>
    <p>Top 3 things cats hate:</p>
    <ol>
      <li>flea treatment</li>
      <li>thunder</li>
      <li>other cats</li>
    </ol>
  </div>
  <form action="https://freecatphotoapp.com/submit-cat-photo">
    <label for="indoor"><input id="indoor" type="radio" name="indoor-outdoor" value="indoor" checked> Indoor</label>
    <label for="outdoor"><input id="outdoor" type="radio" name="indoor-outdoor" value="outdoor"> Outdoor</label><br>
    <label for="loving"><input id="loving" type="checkbox" name="personality" value="loving" checked> Loving</label>
    <label for="lazy"><input id="lazy" type="checkbox" name="personality" value="lazy"> Lazy</label>
    <label for="energetic"><input id="energetic" type="checkbox" name="personality" value="energetic"> Energetic</label><br>
    <input type="text" placeholder="cat photo URL" required>
    <button type="submit">Submit</button>
  </form>
</main>
```