一般实现这个效果我们需要借助于js，但是我今天发现一个小技巧了可以单纯通过css就实现，一起来看看吧~
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<div>
<ul>
<li>不可思议</li>
<li>导航栏</li>
<li>光标小下划线</li>
<li>PURE CSS</li>
<li>Nav Underline</li>
</ul>
</div>
</body>
</html>
ul {
display: flex;
position: absolute;
width: 800px;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
list-style:none
}
li {
position: relative;
padding: 20px;
font-size: 24px;
color: #000;
transition: 0.1s all linear;
cursor: pointer;
}
li::before {
content: "";
position: absolute;
top: 0;
left: 100%;
width: 0;
height: 100%;
border-bottom: 2px solid #000;
transition: 0.2s all linear;
}
li:hover::before {
width: 100%;
top: 0;
left: 0;
transition-delay: 0.1s;
border-bottom-color: #000;
}
li:hover ~ li::before {
left: 0;
}
li:active {
background: #000;
color: #fff;
}
image.png
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