Css 简明教程
CSS - :hover
CSS 中的 :hover 伪类用于在用户使用鼠标光标悬停在元素上时定位该元素。其目的是应用样式或触发特定行为，以增强用户体验或提供额外的视觉反馈。
:hover 是一种无需用户进行任何输入即可让交互元素更具动态性和吸引力的工具，只需移动鼠标即可。
CSS :hover - With Background-color Property
这里有一个更改链接背景颜色的示例：
<html>
<head>
<style>
div {
padding: 1rem;
}
a {
background-color: rgb(238, 135, 9);
font-size: 1rem;
padding: 5px;
}
a:hover {
background-color: rgb(235, 235, 169);
}
</style>
</head>
<body>
<div>
<h3>Hover example - link</h3>
<a href="#">Hover over to see the color change!!!</a>
</div>
</body>
</html>CSS :hover - With Button Effect
这里有一个更改按钮背景颜色的示例：
<html>
<head>
<style>
div {
padding: 1rem;
}
button {
background-color: greenyellow;
font-size: large;
}
button:hover {
background-color: gold;
}
</style>
</head>
<body>
<h3>Hover example - button</h3>
<button>Hover me!!!</button>
</div>
</body>
</html>CSS :hover - With Border Effect
这里有一个示例，其中的链接边框在悬停时发生更改：
<html>
<head>
<style>
.link {
color: blue;
text-transform: uppercase;
padding: 20px;
border: 4px solid blue;
border-radius: 10px;
display: inline-block;
}
.link:hover {
color: #494949;
border-radius: 45px;
border-color: #494949;
}
</style>
</head>
<body>
<h3>Hover effect on border of the link</h3>
<div class="button"><a class="link" href="#">Check my borders on hover</a></div>
</body>
</html>CSS :hover - With box-shadow
这里有一个示例，其中在悬停时向链接添加 box-shadow：
<html>
<head>
<style>
a {
font-size: 2rem;
color: #071402;
margin: 0 .25rem;
padding: 0 .25rem;
transition: color .3s ease-in-out, box-shadow .3s ease-in-out;
}
a:hover {
box-shadow: inset 100px 0 0 100px #9ce2cc;
color: rgb(240, 32, 32);
}
</style>
</head>
<body>
<div>
<a href="#">Hover over me!!</a>
</div>
</body>
</html>CSS :hover - With Background Effect
这里有一个示例，其中背景在悬停时在链接上增长：
<html>
<head>
<style>
a {
text-decoration-line: underline;
color: #18272F;
font-size: 2rem;
position: relative;
}
a::before {
content: '';
background-color: rgba(118, 213, 83, 0.75);
font-size: 2rem;
position: absolute;
left: 0;
bottom: 3px;
width: 100%;
height: 10px;
z-index: -1;
transition: all .5s ease-in-out;
}
a:hover::before {
bottom: 0;
height: 100%;
}
</style>
</head>
<body>
<div>
<a href="#">Hover over me!!</a>
</div>
</body>
</html>CSS :hover - Rainbow Color Effect
这里有一个示例，其中链接的底线在悬停时提供彩虹色效果：
<html>
<head>
<style>
a {
color: black;
text-decoration: none;
}
a {
background:
linear-gradient(
to right,
rgb(179, 232, 168),
rgb(185, 162, 215)
),
linear-gradient(
to right,
rgba(255, 0, 0, 1),
rgba(255, 0, 180, 1),
rgba(0, 200, 50, 1)
);
background-size: 100% 5px, 0 5px;
background-position: 100% 100%, 0 100%;
background-repeat: no-repeat;
transition: background-size 700ms;
}
a:hover {
background-size: 0 5px, 100% 5px;
}
body {
display: grid;
font-family: Verdana, Geneva, Tahoma, sans-serif;
font-size: 2rem;
height: 100vh;
}
</style>
</head>
<body>
<div>
<a href="#">Hover over me!!</a>
</div>
</body>
</html>CSS :hover - Shadow Effect
这里有一个示例，其中在悬停时向按钮提供一个阴影效果：
<html>
<head>
<style>
body {
width: 100%;
height: 100vh;
display: grid;
justify-content: center;
align-items: center;
}
.glow {
padding: 10px;
width: 250px;
height: 50px;
border: none;
outline: none;
color: #fff;
background: #111;
cursor: pointer;
position: relative;
z-index: 0;
border-radius: 20px;
}
.glow:before {
content: '';
background: linear-gradient(60deg, #ff0000, #ff7300, #fffb00, #48ff00, #00ffd5, #002bff, #7a00ff, #ff00c8, #ff0000);
position: absolute;
top: -4px;
left:-4px;
background-size: 400%;
z-index: -1;
filter: blur(15px);
width: calc(100% + 6px);
height: calc(100% + 6px);
animation: glowing 20s linear infinite;
opacity: 0;
transition: opacity .3s ease-in-out;
border-radius: 10px;
}
.glow:active {
color: rgb(246, 235, 235)
}
.glow:active:after {
background: transparent;
}
.glow:hover:before {
opacity: 1;
}
.glow:after {
z-index: -1;
content: '';
position: absolute;
width: 100%;
height: 100%;
background: #111;
left: 0;
top: 0;
border-radius: 10px;
}
@keyframes glowing {
0% { background-position: 0 0; }
50% { background-position: 400% 0; }
100% { background-position: 0 0; }
}
</style>
</head>
<body>
<button class="glow" type="button">HOVER OVER & CLICK!</button>
</body>
</html>