---
id: bad87fee1348bd9aedd08835
title: Check Radio Buttons and Checkboxes by Default
challengeType: 0
videoUrl: ''
localeTitle: 默认情况下检查单选按钮和复选框
---

## Description
<section id="description">您可以使用<code>checked</code>属性设置默认情况下要选中的复选框或单选按钮。为此，只需将“checked”一词添加到input元素的内部即可。例如： <code>&lt;input type=&quot;radio&quot; name=&quot;test-name&quot; checked&gt;</code> </section>

## Instructions
<section id="instructions">默认情况下，设置第一个<code>radio buttons</code>和第一个<code>checkboxes</code> 。 </section>

## Tests
<section id='tests'>

```yml
tests:
  - text: 默认情况下，应检查表单上的第一个单选按钮。
    testString: 'assert($("input[type="radio"]").prop("checked"), "Your first radio button on your form should be checked by default.");'
  - text: 默认情况下，应检查表单上的第一个复选框。
    testString: 'assert($("input[type="checkbox"]").prop("checked"), "Your first checkbox on your form should be checked by default.");'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='html-seed'>

```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="/submit-cat-photo">
    <label><input type="radio" name="indoor-outdoor"> Indoor</label>
    <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
    <label><input type="checkbox" name="personality"> Loving</label>
    <label><input type="checkbox" name="personality"> Lazy</label>
    <label><input type="checkbox" name="personality"> Energetic</label><br>
    <input type="text" placeholder="cat photo URL" required>
    <button type="submit">Submit</button>
  </form>
</main>

```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```
</section>