返回到顶部代码

最新推荐文章于 2025-06-04 09:19:44 发布

转载最新推荐文章于 2025-06-04 09:19:44 发布 · 1.8k 阅读

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本文介绍了一个使用jQuery实现的返回顶部按钮的完整代码示例。该功能可在用户滚动页面至一定距离时显示返回顶部按钮，并允许用户点击后快速回到页面顶部。

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<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="http://cdn.bootcss.com/jquery/2.2.0/jquery.min.js"></script>
<script>
jQuery(document).ready(function($){
        var offset = 300,
        offset_opacity = 1200,
        scroll_top_duration = 700,
        $back_to_top = $('.cd-top');
    $(window).scroll(function(){
        ( $(this).scrollTop() > offset ) ? $back_to_top.addClass('cd-is-visible') : $back_to_top.removeClass('cd-is-visible cd-fade-out');
        if( $(this).scrollTop() > offset_opacity ) { 
            $back_to_top.addClass('cd-fade-out');
        }
    });
    $back_to_top.on('click', function(event){
        event.preventDefault();
        $('body,html').animate({
            scrollTop: 0 ,
            }, scroll_top_duration
        );
    });

});
</script>
<style>
.cd-top {
    display: inline-block;
    height: 40px;
    width: 40px;
    position: fixed;
    bottom: 40px;
    right: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    text-indent: 100%;
    white-space: nowrap;
    background: rgba(232, 98, 86, 0.8)
        url(http://www.100sucai.com/img/demo/1335.svg) no-repeat center 50%;
    visibility: hidden;
    opacity: 0;
    -webkit-transition: opacity .3s 0s, visibility 0s .3s;
    -moz-transition: opacity .3s 0s, visibility 0s .3s;
    transition: opacity .3s 0s, visibility 0s .3s;
}

.cd-top.cd-is-visible,.cd-top.cd-fade-out,.no-touch .cd-top:hover {
    -webkit-transition: opacity .3s 0s, visibility 0s 0s;
    -moz-transition: opacity .3s 0s, visibility 0s 0s;
    transition: opacity .3s 0s, visibility 0s 0s;
}

.cd-top.cd-is-visible {
    visibility: visible;
    opacity: 1;
}

.cd-top.cd-fade-out {
    opacity: .5;
}

.no-touch .cd-top:hover {
    background-color: #e86256;
    opacity: 1;
}
</style>
<title>Back To Top | Cody</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
    返回顶部代码
    <div style="height: 1500px;"></div>
    <div class="cd-top">Top</div>
</body>
</html>