211 lines
5.1 KiB
Markdown
211 lines
5.1 KiB
Markdown
---
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id: 58c383d33e2e3259241f3076
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title: 使用属性选择器来设置元素的样式
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cnpymfJ'
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forumTopicId: 301092
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dashedName: use-attribute-selectors-to-style-elements
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---
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# --description--
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我们已经通过设置元素的 `id` 和 `class` 来显示想要的样式。 这就是 ID 选择器和 Class 选择器。 另外,也还有其他的 CSS 选择器可以让我们给特定的元素设置样式。
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让我们再次通过猫咪图片项目来练习 CSS 选择器。
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在这个挑战里,我们需要使用 `[attr=value]` 属性选择器来修改 CatPhotoApp 中复选框的样式。 这个选择器使用特定的属性值来匹配和设置元素样式。 例如,下面的代码会改变所有 `type` 为 `radio` 的元素的外边距。
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```css
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[type='radio'] {
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margin: 20px 0px 20px 0px;
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}
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```
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# --instructions--
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请使用 `type` 属性选择器,设置复选框的上外边距为 10px,下外边距为 15px。
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# --hints--
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应使用 `type` 属性选择器来匹配复选框。
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```js
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assert(
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code.match(
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/<style>[\s\S]*?\[\s*?type\s*?=\s*?("|')checkbox\1\s*?\]\s*?{[\s\S]*?}[\s\S]*?<\/style>/gi
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)
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);
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```
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复选框的上外边距应为 10px。
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```js
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assert(
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(function () {
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var count = 0;
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$("[type='checkbox']").each(function () {
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if ($(this).css('marginTop') === '10px') {
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count++;
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}
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});
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return count === 3;
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})()
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);
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```
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复选框的下外边距应为 15px。
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```js
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assert(
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(function () {
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var count = 0;
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$("[type='checkbox']").each(function () {
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if ($(this).css('marginBottom') === '15px') {
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count++;
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}
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});
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return count === 3;
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})()
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);
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```
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# --seed--
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## --seed-contents--
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```html
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<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
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<style>
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.red-text {
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color: red;
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}
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h2 {
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font-family: Lobster, monospace;
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}
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p {
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font-size: 16px;
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font-family: monospace;
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}
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.thick-green-border {
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border-color: green;
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border-width: 10px;
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border-style: solid;
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border-radius: 50%;
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}
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.smaller-image {
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width: 100px;
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}
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.silver-background {
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background-color: silver;
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}
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</style>
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<h2 class="red-text">CatPhotoApp</h2>
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<main>
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<p class="red-text">Click here to view more <a href="#">cat photos</a>.</p>
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<a href="#"><img class="smaller-image thick-green-border" src="https://cdn.freecodecamp.org/curriculum/cat-photo-app/relaxing-cat.jpg" alt="A cute orange cat lying on its back."></a>
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<div class="silver-background">
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<p>Things cats love:</p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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</div>
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<form action="https://freecatphotoapp.com/submit-cat-photo" id="cat-photo-form">
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<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
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<label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
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<label><input type="checkbox" name="personality" checked> Loving</label>
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<label><input type="checkbox" name="personality"> Lazy</label>
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<label><input type="checkbox" name="personality"> Energetic</label><br>
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<input type="text" placeholder="cat photo URL" required>
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<button type="submit">Submit</button>
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</form>
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</main>
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```
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# --solutions--
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```html
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<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
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<style>
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.red-text {
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color: red;
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}
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h2 {
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font-family: Lobster, monospace;
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}
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p {
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font-size: 16px;
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font-family: monospace;
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}
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.thick-green-border {
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border-color: green;
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border-width: 10px;
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border-style: solid;
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border-radius: 50%;
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}
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.smaller-image {
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width: 100px;
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}
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.silver-background {
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background-color: silver;
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}
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[type='checkbox'] {
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margin-top: 10px;
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margin-bottom: 15px;
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}
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</style>
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<h2 class="red-text">CatPhotoApp</h2>
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<main>
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<p class="red-text">Click here to view more <a href="#">cat photos</a>.</p>
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<a href="#"><img class="smaller-image thick-green-border" src="https://cdn.freecodecamp.org/curriculum/cat-photo-app/relaxing-cat.jpg" alt="A cute orange cat lying on its back."></a>
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<div class="silver-background">
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<p>Things cats love:</p>
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<ul>
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<li>cat nip</li>
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<li>laser pointers</li>
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<li>lasagna</li>
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</ul>
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<p>Top 3 things cats hate:</p>
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<ol>
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<li>flea treatment</li>
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<li>thunder</li>
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<li>other cats</li>
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</ol>
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</div>
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<form action="https://freecatphotoapp.com/submit-cat-photo" id="cat-photo-form">
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<label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
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<label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
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<label><input type="checkbox" name="personality" checked> Loving</label>
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<label><input type="checkbox" name="personality"> Lazy</label>
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<label><input type="checkbox" name="personality"> Energetic</label><br>
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<input type="text" placeholder="cat photo URL" required>
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<button type="submit">Submit</button>
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</form>
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</main>
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```
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