104 lines
1.9 KiB
Markdown
104 lines
1.9 KiB
Markdown
---
|
||
id: 587d78a7367417b2b2512ae0
|
||
title: 使用CSS动画更改按钮的悬停状态
|
||
challengeType: 0
|
||
videoUrl: 'https://scrimba.com/c/cg4vZAa'
|
||
forumTopicId: 301073
|
||
dashedName: use-css-animation-to-change-the-hover-state-of-a-button
|
||
---
|
||
|
||
# --description--
|
||
|
||
你可以在按钮悬停时使用 `@keyframes` 改变按钮的颜色。
|
||
|
||
下面是在图片悬停时改变图片宽度的例子：
|
||
|
||
```html
|
||
<style>
|
||
img {
|
||
width: 30px;
|
||
}
|
||
img:hover {
|
||
animation-name: width;
|
||
animation-duration: 500ms;
|
||
}
|
||
|
||
@keyframes width {
|
||
100% {
|
||
width: 40px;
|
||
}
|
||
}
|
||
</style>
|
||
|
||
<img src="https://cdn.freecodecamp.org/curriculum/applied-visual-design/google-logo.png" alt="Google's Logo" />
|
||
```
|
||
|
||
# --instructions--
|
||
|
||
注意 `ms` 代表毫秒，1000ms 等于 1s。
|
||
|
||
使用 `@keyframes` 来改变 `button` 元素的 `background-color`，使其在悬停时变成 `#4791d0`。 `@keyframes` 规则应该只有一个 `100%` 条目。
|
||
|
||
# --hints--
|
||
|
||
@keyframes 规则的 `animation-name` 应该是 background-color。
|
||
|
||
```js
|
||
assert(code.match(/@keyframes\s+?background-color\s*?{/g));
|
||
```
|
||
|
||
在 `@keyframes` 为 100% 的位置，应将 `background-color` 改成 `#4791d0`。
|
||
|
||
```js
|
||
assert(code.match(/100%\s*?{\s*?background-color:\s*?#4791d0;\s*?}/gi));
|
||
```
|
||
|
||
# --seed--
|
||
|
||
## --seed-contents--
|
||
|
||
```html
|
||
<style>
|
||
button {
|
||
border-radius: 5px;
|
||
color: white;
|
||
background-color: #0F5897;
|
||
padding: 5px 10px 8px 10px;
|
||
}
|
||
|
||
button:hover {
|
||
animation-name: background-color;
|
||
animation-duration: 500ms;
|
||
}
|
||
|
||
|
||
</style>
|
||
|
||
<button>Register</button>
|
||
```
|
||
|
||
# --solutions--
|
||
|
||
```html
|
||
<style>
|
||
button {
|
||
border-radius: 5px;
|
||
color: white;
|
||
background-color: #0F5897;
|
||
padding: 5px 10px 8px 10px;
|
||
}
|
||
|
||
button:hover {
|
||
animation-name: background-color;
|
||
animation-duration: 500ms;
|
||
}
|
||
|
||
@keyframes background-color {
|
||
100% {
|
||
background-color: #4791d0;
|
||
}
|
||
}
|
||
</style>
|
||
<button>Register</button>
|
||
```
|