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<!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>获取滚动值案例</title>
<link rel="icon" type="image/x-icon" href="images/2.png">
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<style>
*{margin: 0;padding: 0}
.con{
width: 100%;
height: 60px;
background: rgba(160,3,162,0.1);
box-shadow: 1px 3px 7px #ccc;
line-height: 60px;position: fixed;
}
.con2{
background: rgba(160,3,162,0.4);
}
form{
width: 500px;
widows: 35px;
position: relative;
margin: 0 auto;
}
input{
width: 480px;
height: 35px;
border-radius: 20px;
border: none;
outline: none;
padding-left: 20px;
}
button{
width: 70px;
height: 35px;
order: none;
border-top-right-radius: 20px;
border:none;
color:#fff;
position: absolute;
right: 0;
top: 14px;
outline: none;
font-weight: bold;
background: rgba(160,3,162,0.4);
}
[placeholder]{color: rgba(160,3,162,0.6);}
.pic{
width: 70%;
height: 500px;
background:url(images/3.jpg);
margin: 0 auto;
}
.box{
width: 70%;
height: 1200px;
background:rgba(108,108,106,0.1);
margin: 0 auto;
}
</style>
</head>
<body>
<div class="con">
<form>
<input type="text" placeholder="#请输入关键词#">
<button>搜索</button>
</form>
</div>
<div class="pic"></div>
<div class="box"></div>
<script>
$(function(){
$(window).scroll(function(){
if($(window).scrollTop()>60){
$('.con').css('display','none')
}else{
$('.con').css('display','block')
}
if($(window).scrollTop()>580){
$('.con').addClass('con2').css('display','block')
}else{
$('.con').removeClass('con2')
}
})
})
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例