代码比较简单，不再做过多介绍了
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>手写滑块</title>
<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://cdn.staticfile.org/font-awesome/4.7.0/css/font-awesome.css">
</head>
<style>
.body {
background: #607d8b!important;
}
.mindiv {
width: 600px;
height: 400px;
margin: 100px auto;
box-shadow: 0 0 10px rgba(0, 0, 0, .1);
}
.slidebox {
position: relative;
overflow: hidden;
height: 45px;
}
.slideboxitem {
padding: 6px 15px;
height: 36px;
text-align: center;
font-size: 14px;
line-height: 36px;
font-weight: 600;
color: #607d8b;
cursor: pointer;
float: left;
}
.slidebottom {
height: 3px;
position: absolute;
bottom: 0;
left: 0;
transition: all 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
background: #607d8b;
}
</style>
<body>
<div class="mindiv">
<div class="slidebox">
<div class="slideboxitem">一</div>
<div class="slideboxitem">选项二</div>
<div class="slideboxitem">选项三选项三</div>
<div class="slideboxitem">选项四</div>
<div class="slidebottom"></div>
</div>
</div>
</body>
<script>
var bottomobject = {
left: '15px',
width: $(".slideboxitem").eq(0).width()
}
$(".slidebottom").css({"width": bottomobject.width,"left": bottomobject.left});
$(".slideboxitem").on("click", function() {
var width = $(this).width();
var left = $(this).offset().left - $(".mindiv").offset().left + 15;
$(".slidebottom").css({"width": width,"left": left});
})
</script>
</html>
