仿淘宝滚动页面效果 

<!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>Document</title>
    <style>
        body {
            background: rgba(151, 150, 150, .2);
        }
        
        div {
            width: 95%;
        }
        
        .topC {
            background: orange;
            height: 300px;
            width: 95%;
            margin-bottom: 10px;
        }
        
        .banner {
            background: plum;
            height: 300px;
            margin-bottom: 10px;
        }
        
        .main {
            background: darkcyan;
            height: 800px;
        }
        
        ul {
            position: absolute;
            list-style: none;
            margin: 0;
            padding: 0;
            top: 360px;
            right: 10px;
            background: white;
        }
        
        li {
            width: 40px;
            height: 40px;
            font-size: 14px;
            text-align: center;
            margin: 5px auto;
            border-top: rgb(214, 210, 210) 1px solid;
        }
        
        .top {
            display: none;
        }
    </style>
</head>

<body>
    <div class="topC"></div>
    <div class="banner"></div>
    <div class="main"></div>
    <ul>
        <li>实惠热卖</li>
        <li>淘宝特色</li>
        <li>猜你喜欢</li>
        <li class="top"><span>顶部</span></li>
        <li>反馈</li>
        <li>暴恐举报</li>
    </ul>

    <script>
        var ul = document.querySelector('ul');
        var topT = document.querySelector('.banner').offsetTop;
        var ulT = ul.offsetTop;
        var banT = ulT - topT;
        var mainT = document.querySelector('.main').offsetTop;

        document.addEventListener('scroll', function() {
            // 获取页面卷去部分 用 window.pageYOffset
            if (window.pageYOffset >= topT) {
                ul.style.position = 'fixed';
                ul.style.top = banT + 'px';
            } else {
                ul.style.position = 'absolute';
                ul.style.top = ulT + 'px';
            }
            var top = document.querySelector('.top');
            if (window.pageYOffset >= mainT) {
                top.style.display = 'block';
            } else {
                top.style.display = 'none';
            }
            // console.log(window.pageYOffset);
        })
    </script>
</body>

</html>

 

posted @ 2019-10-19 22:47  晴天宝宝i  阅读(342)  评论(0)    收藏  举报