源码Demo:
<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>鼠标悬停下划线</title><style>
body {display: flex;justify-content: center;align-items: center;min-height: 100vh;background: #f8f8f8;font: normal 400 130%/1.5 -apple-system, BlinkMacSystemFont, Helvetica, Arial, sans-serif;
}nav {display: grid;grid-auto-flow: column;grid-gap: 1em;
}a {position: relative;font-weight: 600;text-decoration: none;color: rgba(0, 0, 0, 0.4);transition: color .3s ease;
}
a::after {--scale: 0;content: '';position: absolute;left: 0;right: 0;top: 100%;height: 3px;background: #4c81c9;-webkit-transform: scaleX(var(--scale));transform: scaleX(var(--scale));-webkit-transform-origin: var(--x) 50%;transform-origin: var(--x) 50%;transition: -webkit-transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1);transition: transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1);transition: transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1), -webkit-transform 0.3s cubic-bezier(0.535, 0.05, 0.355, 1);
}
a:hover {color: #4c81c9;
}
a:hover::after {--scale: 1;
}
</style></head>
<body><nav>
<a href="#">首页</a>
<a href="#">产品展示</a>
<a href="#">新闻资讯</a>
<a href="#">关于我们</a>
</nav><script>
document.querySelectorAll('a').forEach(elem => {elem.onmouseenter =elem.onmouseleave = e => {const tolerance = 5;const left = 0;const right = elem.clientWidth;let x = e.pageX - elem.offsetLeft;if (x - tolerance < left) x = left;if (x + tolerance > right) x = right;elem.style.setProperty('--x', `${x}px`);};});
</script></body>
</html>
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