<!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>
ul {
display: flex;
}
li {
position: relative;
padding: 20px;
transition: 0.2s all linear;
cursor: pointer;
list-style: none;
}
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%;
left: 0;
top: 0;
transition-delay: 0.1s;
border-bottom-color: #000;
z-index: -1;
}
li:hover~li::before {
left: 0;
}
li:active {
background-color: #000;
color: #fff;
}
</style>
</head>
<body>
<ul>
<li>导航栏1</li>
<li>导航栏2</li>
<li>导航栏3</li>
<li>导航栏4</li>
<li>导航栏5</li>
</ul>
</body>
</html>