制作一个html页面返回顶部的悬浮按钮-木庄网络博客

本文摘自PHP中文网，作者V，侵删。

具体代码如下所示：

（学习视频分享：html视频教程）

CSS样式代码：

.back-to {
            bottom: 55px;
            overflow: hidden;
            position: fixed;
            right: 10px;
            width: 110px;
            z-index: 999;
        }
        .back-to .back-top {
            background: url("./images/top.png") no-repeat scroll 0 0 transparent;
            display: block;
            float: right;
            height: 50px;
            margin-left: 10px;
            outline: 0 none;
            text-indent: -9999em;
            width: 50px;
        }
        .back-to .back-top:hover {
            background-position: -50px 0
        }

DIV：

<div style="display:none;" class="back-to" id="toolBackTop">
        <a title="返回顶部" onclick="window.scrollTo(0,0);return false;" href="#top" class="back-top"></a>
    </div>

Javascript代码：

$(function () {
            var bt = $('#toolBackTop');
            var sw = $(document.body)[0].clientWidth;
      
            var limitsw = (sw - 840) / 2 - 80;  //距离右侧距离
            if (limitsw > 0){
                limitsw = parseInt(limitsw);
                bt.css("right",limitsw/8);
            }
      
            $(window).scroll(function() {
                var st = $(window).scrollTop();
                if(st > 30){
                        bt.show();
                }else{
                        bt.hide();
                }
            });
    });