freeCodeCamp/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-che...

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---
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>