JD商城经典爬楼梯布局，看到就是赚到
<style>* {margin: 0;padding: 0;}#menu {position: fixed;top: 25%;left: 40px;width: 30px;border: 1px solid;}#menu ul li {position: relative;width: 30px;height: 30px;list-style: none;text-align: center;line-height: 30px;font-size: 12px;cursor: pointer;border-bottom: 1px dotted #AAAAAA;}#menu ul li.last {background: #ccc;color: black;border-bottom: none;}#menu ul li span {display: none;width: 30px;height: 30px;position: absolute;top: 0;left: 0;color: red;}#menu ul li:hover span {display: block;background: darkred;color: white;}#menu ul li span.active {display: block;background: darkred;color: white;}#menu ul li:hover span.active {display: block;background: darkred;color: white;}#header,#main,#footer {margin: auto;width: 1000px;text-align: center;font-size: 40px;font-weight: bold;line-height: 500px;}#main div {height: 700px;font-size: 50px;color: honeydew;line-height: 700px;}#header {height: 500px;background: #ccc;}#footer {height: 500px;background: #ccc;}</style><div id="menu"><ul><li>1F <span>服饰</span> </li><li>2F <span>美妆</span> </li><li>3F <span>手机</span> </li><li>4F <span>家电</span> </li><li>5F <span>数码</span> </li><li>6F <span>运动</span> </li><li>7F <span>居家</span> </li><li>8F <span>母婴</span> </li><li>9F <span>食品</span> </li><li>10F <span>图书</span> </li><li>11F <span>服务</span> </li><li class="last">Top</li></ul></div><div id="header">头部</div><div id="main"><div class="Louti" style="background: #FF0000;">服饰</div><div class="Louti" style="background: #FF7F00;">美妆</div><div class="Louti" style="background: #FFFF00;">手机</div><div class="Louti" style="background: #00FF00;">家电</div><div class="Louti" style="background: #00FFFF;">数码</div><div class="Louti" style="background: #0000FF;">运动</div><div class="Louti" style="background: #8B00FF;">居家</div><div class="Louti" style="background: aquamarine;">母婴</div><div class="Louti" style="background: pink;">食品</div><div class="Louti" style="background: bisque;">图书</div><div class="Louti" style="background: lightgoldenrodyellow;">服务</div></div><div id="footer">尾部</div><script>// 点击时滑动到该楼层$("#menu ul li:not(:last)").click(function(){$(this).find("span").addClass("active").end().siblings().find("span").removeClass("active");var sTop = $(".Louti").eq($(this).index()).offset().top;$("body,html").animate({"scrollTop": sTop}, 1000);})//点击返回头部$(".last").click(function(){$("body,html").animate({"scrollTop": 0}, 1000);$("#menu li span").removeClass("active");})// 滚动条滚动 楼层号$(window).scroll(function () {//获取页面滚走的距离var sTop = $(document).scrollTop();// 找到满足某个条件的楼层对象var $floor = $(".Louti").filter(function () {// console.log('offset:'+$(this).offset().top)// console.log('stop:'+sTop)// console.log('div:'+$(this).height())return Math.abs($(this).offset().top - sTop) < $(this).height() / 2;})$("#menu li").eq($floor.index()).find("span").addClass("active").end().siblings().find("span").removeClass("active");})</script>
