一般實現這個效果我們需要借助于js，但是我今天發現一個小技巧了可以單純通過css就實現，一起來看看吧~
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<div>
<ul>
<li>不可思議</li>
<li>導航欄</li>
<li>光標小下劃線</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
