freeCodeCamp/curriculum/challenges/chinese/01-responsive-web-design/basic-css/use-an-id-attribute-to-styl...

4.9 KiB

id title challengeType videoUrl forumTopicId dashedName
bad87dee1348bd9aede07836 使用 id 属性来设定元素的样式 0 https://scrimba.com/c/cakyZfL 18339 use-an-id-attribute-to-style-an-element

--description--

通过 id 属性,你可以做一些很酷的事情。就像 class 一样,你可以使用 CSS 来设置他们的样式。

不过,id 不可以重复,它只能作用于一个元素上。 如果一个元素同时应用了 class 和 id,且两者设置的样式有冲突,会优先应用 id 中所设置的样式。

选择 idcat-photo-element 的元素,并设置它的背景颜色为绿色。 可以在 style 标签里这样写:

#cat-photo-element {
  background-color: green;
}

注意在 style 标签里,声明 class 的时候必须在名字前插入 . 符号。 同样,在声明 id 的时候,也必须在名字前插入 # 符号。

--instructions--

请将 idcat-photo-form 的表单的背景颜色设置为绿色。

--hints--

form 元素的 id 应为 cat-photo-form

assert($('form').attr('id') === 'cat-photo-form');

form 元素应含有 background-color 属性,颜色为绿色。

assert($('#cat-photo-form').css('background-color') === 'rgb(0, 128, 0)');

确保 form 元素的 id 设置正确。

assert(
  code.match(/<form.*cat-photo-form.*>/gi) &&
    code.match(/<form.*cat-photo-form.*>/gi).length > 0
);

不要在 form 元素上添加其他 class 属性或者 style 行内样式。

assert(!code.match(/<form.*style.*>/gi) && !code.match(/<form.*class.*>/gi));

--seed--

--seed-contents--

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
  .red-text {
    color: red;
  }

  h2 {
    font-family: Lobster, monospace;
  }

  p {
    font-size: 16px;
    font-family: monospace;
  }

  .thick-green-border {
    border-color: green;
    border-width: 10px;
    border-style: solid;
    border-radius: 50%;
  }

  .smaller-image {
    width: 100px;
  }

  .silver-background {
    background-color: silver;
  }
</style>

<h2 class="red-text">CatPhotoApp</h2>
<main>
  <p class="red-text">Click here to view more <a href="#">cat photos</a>.</p>

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

  <div class="silver-background">
    <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" id="cat-photo-form">
    <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
    <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
    <label><input type="checkbox" name="personality" checked> 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>

--solutions--

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
  .red-text {
    color: red;
  }

  h2 {
    font-family: Lobster, monospace;
  }

  p {
    font-size: 16px;
    font-family: monospace;
  }

  .thick-green-border {
    border-color: green;
    border-width: 10px;
    border-style: solid;
    border-radius: 50%;
  }

  .smaller-image {
    width: 100px;
  }

  .silver-background {
    background-color: silver;
  }

  #cat-photo-form {
    background-color: green;
  }
</style>

<h2 class="red-text">CatPhotoApp</h2>
<main>
  <p class="red-text">Click here to view more <a href="#">cat photos</a>.</p>

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

  <div class="silver-background">
    <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" id="cat-photo-form">
    <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
    <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
    <label><input type="checkbox" name="personality" checked> 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>