freeCodeCamp/curriculum/challenges/chinese/01-responsive-web-design/basic-html-and-html5/check-radio-buttons-and-checkboxes-by-default.chinese.md

id, title, challengeType, videoUrl, forumTopicId, localeTitle

id	title	challengeType	videoUrl	forumTopicId	localeTitle
bad87fee1348bd9aedd08835	Check Radio Buttons and Checkboxes by Default	0	https://scrimba.com/p/pVMPUv/cWk3Qh6	301094	给单选按钮和复选框添加默认选中项

Description

如果想设置某个单选按钮或多选按钮默认被选中，只需给input元素添加 "checked" 属性。 例如: <input type="radio" name="test-name" checked>

Instructions

把第一个radio button和第一个checkbox都设置为默认选中。

Tests

tests:
  - text: '表单的第一个单选按钮应该被默认选中。'
    testString: assert($('input[type="radio"]').prop("checked"));
  - text: '表单的第一个多选按钮应该被默认选中。'
    testString: assert($('input[type="checkbox"]').prop("checked"));

Challenge Seed

<h2>CatPhotoApp</h2>
<main>
<p>点击查看更多<a href="#">猫咪图片</a>。</p>
  
  <a href="#"><img src="https://bit.ly/fcc-relaxing-cat" alt="一只仰卧着的萌猫"></a>
  
  <p>猫咪最喜欢的三件东西：</p>
  <ul>
    <li>猫薄荷</li>
    <li>激光笔</li>
    <li>千层饼</li>
  </ul>
  <p>猫咪最讨厌的三件东西：</p>
  <ol>
    <li>跳蚤</li>
    <li>打雷</li>
    <li>同类</li>
  </ol>
  <form action="/submit-cat-photo">
    <label><input type="radio" name="indoor-outdoor">室内</label>
    <label><input type="radio" name="indoor-outdoor">室外</label><br>
    <label><input type="checkbox" name="personality">忠诚</label>
    <label><input type="checkbox" name="personality">懒惰</label>
    <label><input type="checkbox" name="personality">积极</label><br>
    <input type="text" placeholder="猫咪图片地址" required>
    <button type="submit">提交</button>
  </form>
</main>

Solution