<html>
<head>
<meta charset="UTF-8">
<title>鼠标悬停效果</title>
<style type="text/css">
*{
margin: 0
padding: 0
}
body{
background-color: #000
}
a{
width: 200px
height: 50px
display: block
text-align: center
line-height: 50px
text-decoration: none
position: absolute
top: 50%
left: 50%
transform: translate(-50%,-50%)
font-size: 24px
font-weight: bold
color: white
border: 1px solid white
overflow: hidden
}
a::before{
content: ""
position: absolute
top: 0
left: -100%
width: 100%
height: 100%
background-image: linear-gradient(60deg,transparent,rgba(146,148,248,.4),transparent)
transition: all 0.5s
}
a:hover::before{
left: 100%
}
a:hover{
box-shadow: 0 2px 10px 8px rgba(146,148,248,.4)
}
</style>
</head>
<body>
<a href="#">鼠标悬停效果</a>
</body>
</html>
CSS+HTML<悬停下划线效果>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
body {
display: flex
height: 100vh
justify-content: center
align-items: center
}
ul {
padding: 0
margin: 0
list-style-type: none
}
ul li{
padding: 5px 0
}
ul li a {
position: relative
display: inline-block
text-decoration: none
color: #3a3a3a
/* 转大写 */
text-transform: uppercase
padding: 4px 0
transition: 0.5s
font-weight: bold
}
ul li a::after {
position: absolute
content: ""
width: 100%
height: 3px
top: 100%
left: 0
background: #347cdb
transition: transform 0.5s
transform: scaleX(0)
transform-origin: right
}
ul li a:hover {
color: #585858
text-shadow: 0 0 10px #ccc
}
ul li a:hover::after {
transform: scaleX(1)
transform-origin: left
}
</style>
</head>
<body>
<ul>
<li><a href="#">home</a></li>
<li><a href="#">archives</a></li>
<li><a href="#">tags</a></li>
<li><a href="#">categories</a></li>
<li><a href="#">about</a></li>
</ul>
</body>
</html>
css中悬停改变样式的最好方法是用伪类选择器div:hover{}。css代码示例如下：\x0d\x0a\x0d\x0adiv{width:100pxheight:200pxbackground:#000}\x0d\x0adiv:hover{background:#fff}\x0d\x0a\x0d\x0a这是一个修改背景颜色的示例，伪类里可以修改跟多的样式，宽度，高度或者字体大小，字体颜色都是可以修改的。$("p").mouseenter(function(){$("p").css("background-color","yellow")
})
只写mouseenter的动效的话，鼠标经过之后，状态会一直保留，如果想要鼠标离开之后出现新的状态，就在后面再加一个mouseleave事件，
如果简单一点的，hover就可以直接完成，但是hover是包含鼠标进入和离开2种状态的。
