135 lines
3.1 KiB
Markdown
135 lines
3.1 KiB
Markdown
---
|
|
id: 587d781c367417b2b2512abf
|
|
title: 降低元素的透明度
|
|
challengeType: 0
|
|
videoUrl: 'https://scrimba.com/c/c7aKqu4'
|
|
forumTopicId: 301055
|
|
dashedName: decrease-the-opacity-of-an-element
|
|
---
|
|
|
|
# --description--
|
|
|
|
CSS 里的 `opacity` 属性用来设置元素的透明度。
|
|
|
|
<blockquote>属性值为 1 代表完全不透明。 <br>属性值为 0.5 代表半透明。 <br>属性值为 0 代表完全透明。</blockquote>
|
|
|
|
透明度会应用到元素内的所有内容，不论是图片，还是文本，或是背景色。
|
|
|
|
# --instructions--
|
|
|
|
将 class 为 `links` 的所有超链接的 `opacity` 属性值设置 0.7。
|
|
|
|
# --hints--
|
|
|
|
应使用 `links` class 选择所有的超链接，并设置其 `opacity` 属性值为 0.7。
|
|
|
|
```js
|
|
assert(
|
|
/\.links\s*{([\s\S]*?;)*\s*opacity\s*:\s*0*\.70*\s*(;[\s\S]*?|\s*)}/.test(
|
|
$('style').text()
|
|
)
|
|
);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```html
|
|
<style>
|
|
h4 {
|
|
text-align: center;
|
|
background-color: rgba(45, 45, 45, 0.1);
|
|
padding: 10px;
|
|
font-size: 27px;
|
|
}
|
|
p {
|
|
text-align: justify;
|
|
}
|
|
.links {
|
|
text-align: left;
|
|
color: black;
|
|
|
|
}
|
|
#thumbnail {
|
|
box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
|
|
}
|
|
.fullCard {
|
|
width: 245px;
|
|
border: 1px solid #ccc;
|
|
border-radius: 5px;
|
|
margin: 10px 5px;
|
|
padding: 4px;
|
|
}
|
|
.cardContent {
|
|
padding: 10px;
|
|
}
|
|
.cardText {
|
|
margin-bottom: 30px;
|
|
}
|
|
</style>
|
|
<div class="fullCard" id="thumbnail">
|
|
<div class="cardContent">
|
|
<div class="cardText">
|
|
<h4>Alphabet</h4>
|
|
<hr>
|
|
<p><em>Google was founded by Larry Page and Sergey Brin while they were <u>Ph.D. students</u> at <strong>Stanford University</strong>.</em></p>
|
|
</div>
|
|
<div class="cardLinks">
|
|
<a href="https://en.wikipedia.org/wiki/Larry_Page" target="_blank" class="links">Larry Page</a><br><br>
|
|
<a href="https://en.wikipedia.org/wiki/Sergey_Brin" target="_blank" class="links">Sergey Brin</a>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```html
|
|
<style>
|
|
h4 {
|
|
text-align: center;
|
|
background-color: rgba(45, 45, 45, 0.1);
|
|
padding: 10px;
|
|
font-size: 27px;
|
|
}
|
|
p {
|
|
text-align: justify;
|
|
}
|
|
.links {
|
|
text-align: left;
|
|
color: black;
|
|
opacity: 0.7;
|
|
}
|
|
#thumbnail {
|
|
box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
|
|
}
|
|
.fullCard {
|
|
width: 245px;
|
|
border: 1px solid #ccc;
|
|
border-radius: 5px;
|
|
margin: 10px 5px;
|
|
padding: 4px;
|
|
}
|
|
.cardContent {
|
|
padding: 10px;
|
|
}
|
|
.cardText {
|
|
margin-bottom: 30px;
|
|
}
|
|
</style>
|
|
<div class="fullCard" id="thumbnail">
|
|
<div class="cardContent">
|
|
<div class="cardText">
|
|
<h4>Alphabet</h4>
|
|
<hr>
|
|
<p><em>Google was founded by Larry Page and Sergey Brin while they were <u>Ph.D. students</u> at <strong>Stanford University</strong>.</em></p>
|
|
</div>
|
|
<div class="cardLinks">
|
|
<a href="https://en.wikipedia.org/wiki/Larry_Page" target="_blank" class="links">Larry Page</a><br><br>
|
|
<a href="https://en.wikipedia.org/wiki/Sergey_Brin" target="_blank" class="links">Sergey Brin</a>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
```
|