導航欄下劃線動畫在網頁設計中是非常常見的交互，下面将介紹幾種非常常見，非常nice的動畫特效，廢話不多說直接上演示和代碼。
一、效果圖：
css下劃線
二、源碼如下：
<body>
<p>樣式1</p>
<ul id="demo1">
<li>首頁</li>
<li>産品</li>
<li>服務</li>
<li>關于</li>
</ul>
<p>樣式2</p>
<ul id="demo2">
<li>首頁</li>
<li>産品</li>
<li>服務</li>
<li>關于</li>
</ul>
<p>樣式3</p>
<ul id="demo3">
<li>首頁</li>
<li>産品</li>
<li>服務</li>
<li>關于</li>
</ul>
<p>樣式4</p>
<ul id="demo4">
<li>首頁</li>
<li>産品</li>
<li>服務</li>
<li>關于</li>
</ul>
</body>
<style type="text/css">
p{
text-align: center;
margin: 40px 0 10px 0;
}
ul{
padding: 0;
width: 400px;
height: 45px;
margin: auto;
list-style: none;
background-color: rgb(0,0,0,0.3);
display: flex;
}
li{
flex: 1;
height: 100%;
display: flex;
align-items: center;
justify-content: center;
position: relative;
}
/***************樣式1 *********/
#demo1 li:before{
content: '';
position: absolute;
width: 80%;
left: 10%;
bottom: 10px;
height: 5px;
background-color: coral;
opacity: 0;
}
#demo1 li:hover:before{
bottom: 0;
opacity: 1;
transition: bottom 0.3s,opacity 0.3s 0.1s;
}
/***************樣式2 *********/
#demo2 li:before{
content: '';
position: absolute;
width: 0;
left: 50%;
bottom: 0;
height: 5px;
background-color: coral;
}
#demo2 li:hover:before{
width: 80%;
left: 10%;
transition: all 0.5s;
}
/***************樣式3 *********/
#demo3 li:before{
content: '';
position: absolute;
width: 0;
left: 100%;
bottom: 0;
height: 5px;
background-color: coral;
}
#demo3 li:hover:before{
width: 80%;
left: 10%;
transition: all 0.5s;
}
#demo3 li:hover ~ li:before{
left: 0;
}
/***************樣式4 *********/
#demo4 li:before{
content: '';
position: absolute;
width: 0;
left: 0;
bottom: 0;
height: 5px;
background-color: coral;
}
#demo4 li:after{
content: '';
position: absolute;
width: 0;
right: 0;
bottom: 0;
height: 5px;
background-color: coral;
}
#demo4 li:hover:before{
width: 50%;
transition: all 0.3s ease-in-out;
}
#demo4 li:hover:after{
width: 50%;
transition: all 0.3s ease-in-out;
}
</style>
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