HTML5+CSS3实现富有弹性的导航栏标签，切换如此Q弹的标签栏，你确定不手敲一遍？没有用到JavaScript哦！
效果：
源码：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<title>弹性标签动画</title>
<link href="https://cdn.bootcdn.net/ajax/libs/font-awesome/4.7.0/css/font-awesome.css" rel="stylesheet">
<link rel="stylesheet" href="../css/6.css">
</head>
<body>
<div class="wrapper">
<nav>
<input type="radio" name="tab" id="home" checked>
<input type="radio" name="tab" id="comment">
<input type="radio" name="tab" id="envelope">
<input type="radio" name="tab" id="heart">
<input type="radio" name="tab" id="user">
<label for="home" class="home" onclick="location.href='#';"><a href="#"><i class="fa fa-home" aria-hidden="true"></i>Home</a></label>
<label for="comment" class="comment" onclick="location.href='#';"><a href="#"><i class="fa fa-comment" aria-hidden="true"></i>Comment</a></label>
<label for="envelope" class="envelope" onclick="location.href='#';"><a href="#"><i class="fa fa-envelope" aria-hidden="true"></i>Envelope</a></label>
<label for="heart" class="heart" onclick="location.href='#';"><a href="#"><i class="fa fa-heart" aria-hidden="true"></i>Heart</a></label>
<label for="user" class="user" onclick="location.href='#';"><a href="#"><i class="fa fa-user" aria-hidden="true"></i>User</a></label>
<div class="tab"></div>
</nav>
</div>
</body>
</html>
*{
margin: 0;
padding: 0;
box-sizing: border-box;
}
body{
/* 100%窗口高度 */
height: 100vh;
/* 弹性布局 水平垂直居中 文字居中 */
display: flex;
align-items: center;
justify-content: center;
text-align: center;
}
.wrapper{
/* 60%窗口宽度 */
width: 60vw;
height: 60px;
line-height: 60px;
background-color: #fff;
/* 盒子阴影 */
box-shadow: 0px 5px 15px rgba(0,0,0,0.25);
border-radius: 50px;
}
.wrapper nav{
display: flex;
position: relative;
}
.wrapper nav label{
flex:1;
width: 100%;
position: relative;
z-index: 1;
cursor: pointer;
}
.wrapper nav label a{
position: relative;
z-index: -1;
color: #1d1f20;
font-size: 20px;
font-weight: 500;
text-decoration: none;
pointer-events: none;
}
.wrapper nav label a i{
font-size: 25px;
margin: 0px 7px;
}
.wrapper nav .tab{
position: absolute;
height: 100%;
width: 20%;
left: 0px;
bottom: 0px;
/* 渐变背景 自左向右 */
background: linear-gradient(to right, #f09819, #ff5858);
border-radius: 50px;
/* 动画过渡 贝塞尔曲线 */
transition: 0.6s cubic-bezier(0.68,-0.55,0.265,1.55);
}
.wrapper nav input{
display: none;
}
.wrapper nav #home:checked ~ label.home a,
.wrapper nav #comment:checked ~ label.comment a,
.wrapper nav #envelope:checked ~ label.envelope a,
.wrapper nav #heart:checked ~ label.heart a,
.wrapper nav #user:checked ~ label.user a{
color: #fff;
transition: 0.6s;
}
.wrapper nav #comment:checked ~ .tab{
left: 20%;
}
.wrapper nav #envelope:checked ~ .tab{
left: 40%;
}
.wrapper nav #heart:checked ~ .tab{
left: 60%;
}
.wrapper nav #user:checked ~ .tab{
left: 80%;
}
