极客教程CSS 鼠标悬停
CSS的 :hover 伪类用于通过用户将鼠标悬停在元素上来定位该元素。它的目的是应用样式或触发特定的行为，以增强用户体验或提供额外的视觉反馈。
CSS鼠标悬停是一种使交互元素更加动态和吸引人的工具，无需除了移动鼠标之外的任何用户输入。
适用于
HTML元素，如按钮，链接，图像等。
CSS语法
:hover {
/* ... */
}
CSS悬停-链接颜色变化
以下是当鼠标光标悬停在链接上时改变其背景颜色的示例：
<html>
<head>
<style>
a {
background-color: #40a944;
color: #fff;
font-size: 1rem;
padding: 10px;
}
a:hover {
background-color: #cfe9d0;
color: #000;
}
</style>
</head>
<body>
<div>
<h2>Bring your cursor on the below link</h2>
<a href="#">Hover over to see the color change!!!</a>
</div>
</body>
</html>
CSS悬停 – 背景颜色更改
以下是当鼠标光标悬停在按钮上时改变其背景颜色的例子：
<html>
<head>
<style>
button {
background-color: greenyellow;
padding: 10px;
font-size: large;
}
button:hover {
background-color: gold;
}
</style>
</head>
<body>
<h2>Bring your cursor on the below button</h2>
<button>Hover me!!!</button>
</div>
</body>
</html>
CSS悬停 – 更改光标形状
以下是当鼠标光标移到按钮上时更改光标形状的示例：
<html>
<head>
<style>
button {
background-color: greenyellow;
padding: 10px;
font-size: large;
}
button:hover {
cursor:pointer;
}
</style>
</head>
<body>
<h2>Bring your cursor on the below button</h2>
<button>Hover me!!!</button>
</div>
</body>
</html>
CSS 悬停 – 改变边框形状
这是一个示例，链接的边框在悬停时发生变化：
<html>
<head>
<style>
.link {
color: #40a944;
text-transform: uppercase;
padding: 20px;
border: 4px solid #40a944;
border-radius: 10px;
display: inline-block;
}
.link:hover {
color: #494949;
border-radius: 45px;
border-color: #494949;
}
</style>
</head>
<body>
<h2>Hover effect on border of the link</h2>
<div class="button"><a class="link" href="#">Check my borders on hover</a></div>
</body>
</html>
CSS悬停 – 添加盒子阴影
这是一个示例，在悬停时为链接添加了盒子阴影：
<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悬停 – 背景放大
这是一个例子，当悬停在链接上时，背景会放大:
<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 悬停 – 彩虹色效果
这是一个例子，链接的下划线在悬停时产生彩虹色效果：
<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悬停 – 阴影效果
这是一个示例，其中按钮在悬停时给出了阴影效果：
<html>
<head>
<style>
body {
width: 100%;
height: 100vh;
display: grid;
}
.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 & Click!</button>
</body>
</html>