1、仿京东固定导航栏案例
需求:当页面滚动到秒杀模块,导航栏自动滑入,否则滑出
分析:
①:用到页面滚动事件
②:检测页面滚动大于等于 秒杀模块的位置 则滑入,否则滑出
③:主要移动的是秒杀模块的顶部位置
javascript
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.content {
overflow: hidden;
width: 1000px;
height: 3000px;
background-color: pink;
margin: 0 auto;
}
.backtop {
display: none;
width: 50px;
left: 50%;
margin: 0 0 0 505px;
position: fixed;
bottom: 60px;
z-index: 100;
}
.backtop a {
height: 50px;
width: 50px;
background: url(./images/bg2.png) 0 -600px no-repeat;
opacity: 0.35;
overflow: hidden;
display: block;
text-indent: -999em;
cursor: pointer;
}
.header {
position: fixed;
top: -80px;
left: 0;
width: 100%;
height: 80px;
background-color: purple;
text-align: center;
color: #fff;
line-height: 80px;
font-size: 30px;
transition: all .3s;
}
.sk {
width: 300px;
height: 300px;
background-color: skyblue;
margin-top: 500px;
}
</style>
</head>
<body>
<div class="header">我是顶部导航栏</div>
<div class="content">
<div class="sk">秒杀模块</div>
</div>
<div class="backtop">
<img src="./images/close2.png" alt="">
<a href="javascript:;"></a>
</div>
<script>
const sk = document.querySelector('.sk')
const header = document.querySelector('.header')
// 1. 页面滚动事件
window.addEventListener('scroll',function(){
// 当页面滚动到 秒杀模块的时候, 就改变 头部的top值
// 页面被卷曲的头部 >= 秒杀模块的位置offsetTop
const n = document.documentElement.scrollTop
// if ( n >= sk.offsetTop){
// header.style.top = 0
// } else {
// header.style.top = '-80px'
// }
header.style.top = n >= sk.offsetTop ? 0 : '-80px'
})
</script>
</body>
</html>
2、电梯导航案例
需求:点击不同的模块,页面可以自动跳转不同的位置
模块分析:
①:页面滚动到对应位置,导航显示,否则隐藏模块
②:点击导航对应小模块,页面会跳到对应大模块位置
③:显示隐藏电梯盒子和返回顶部已经完成,可以放到自执行函数里面,防止遍历污染
④:电梯模块单独放到自执行函数里面
⑤:点击每个模块,页面自动滚动到对应模块,使用事件委托方法更加简单
⑥:页面滚动到对应位置,电梯导航对应模块自动发生变化
⑦:显示隐藏电梯盒子和返回顶部已经完成,可以放到自执行函数里面,防止变量污染
模块分析2:
①:点击小模块,当前添加active这个类
②:解决处理初次获取不到active报错的问题
解决方案:
①:不能直接获取这个类,然后移除,这样会报错
②:先获取这个类,然后加个判断
如果有这个类,就移除
如果没有这个类,返回为null,就不执行移除,就不报错了
③:点击每个模块,页面自动滚动到对应模块,使用事件委托方法更加简单
点击小盒子li,页面跳转到对应大盒子位置
核心思想:把对应大盒子的offsetTop 给document.documentElement.scrollTop
①:我们发现小盒子li的自定义属性里面值 跟 大盒子 后面一致
②:利用模板字符串 把点击的 自定义属性值 给 大盒子,就找到对应的大盒子了
③:然后拿到这个大盒子的offsetTop 值 给 document.documentElement.scrollTop即可
模块分析3:页面滚动到大盒子位置,电梯导航小盒子对应模块自动处于选中状态
①:当页面滚动了,先移除所有小li 里面a 的状态 active 防止有多个 active
②:因为页面滚动需要不断获取大盒子的位置,所以需要把所有的大盒子都获取过来
③:开始进行滚动判断
如果页面滚动大于 新鲜好物大盒子的offsetTop 并且小于 人气推荐盒子的offsetTop 就把 对应的小盒子先出来添加类
依次类推
最后一个,如果大于等于最新专题模块,就选出最后一个对应小盒子(更精确)
javascript
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>小兔鲜儿 - 新鲜 惠民 快捷!</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="renderer" content="webkit">
<link rel="stylesheet" href="./css/common.css">
<link rel="stylesheet" href="./css/index.css">
</head>
<body>
<!-- 项部导航 -->
<div class="xtx_topnav">
<div class="wrapper">
<!-- 顶部导航 -->
<ul class="xtx_navs">
<li>
<a href="javascript:;">请先登录</a>
</li>
<li>
<a href="javascript:;">免费注册</a>
</li>
<li>
<a href="javascript:;">我的订单</a>
</li>
<li>
<a href="javascript:;">会员中心</a>
</li>
<li>
<a href="javascript:;">帮助中心</a>
</li>
<li>
<a href="javascript:;">在线客服</a>
</li>
<li>
<a href="javascript:;">
<i class="mobile sprites"></i>
手机版
</a>
</li>
</ul>
</div>
</div>
<!-- 头部 -->
<div class="xtx_header">
<div class="wrapper">
<!-- 网站Logo -->
<h1 class="xtx_logo"><a href="/">小兔鲜儿</a></h1>
<!-- 主导航 -->
<div class="xtx_navs">
<ul class="clearfix">
<li>
<a href="javascript:;">首页</a>
</li>
<li>
<a href="javascript:;">生鲜</a>
</li>
<li>
<a href="javascript:;">美食</a>
</li>
<li>
<a href="javascript:;">餐厨</a>
</li>
<li>
<a href="javascript:;">电器</a>
</li>
<li>
<a href="javascript:;">居家</a>
</li>
<li>
<a href="javascript:;">洗护</a>
</li>
<li>
<a href="javascript:;">孕婴</a>
</li>
<li>
<a href="javascript:;">服装</a>
</li>
</ul>
</div>
<!-- 站内搜索 -->
<div class="xtx_search clearfix">
<!-- 购物车 -->
<a href="javascript:;" class="xtx_search_cart sprites">
<i>2</i>
</a>
<!-- 搜索框 -->
<div class="xtx_search_wrapper">
<input type="text" placeholder="搜一搜">
</div>
</div>
</div>
</div>
<!-- 分类及焦点图 -->
<div class="xtx_entry">
<div class="wrapper">
<!-- 分类 -->
<div class="xtx_category">
<!-- 顶级分类 -->
<ul class="xtx_category_super">
<li>
<a href="javascript:;">
生鲜
<small>水果</small>
<small>蔬菜</small>
</a>
<i class="sprites"></i>
</li>
<li class="active">
<a href="javascript:;">
美食
<small>面点</small>
<small>干果</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
电器
<small>数码产品</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
居家
<small>床品</small>
<small>四件套</small>
<small>被枕</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
洗护
<small>洗发洗护</small>
<small>美妆</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
孕婴
<small>奶粉</small>
<small>玩具</small>
<small>辅食</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
餐橱
<small>数码产品</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
服饰
<small>女装</small>
<small>男装</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
杂货
<small>户外</small>
<small>图书</small>
</a>
<i class="sprites"></i>
</li>
<li>
<a href="javascript:;">
品牌
<small>品牌制造</small>
</a>
<i class="sprites"></i>
</li>
</ul>
<!-- 子分类 -->
<div class="xtx_category_subset">
</div>
</div>
<!-- 焦点图 -->
<div class="xtx_banner">
<ul>
<li>
<a href="javascript:;">
<img src="./uploads/banner_1.png" alt="">
</a>
</li>
</ul>
<!-- 切换按钮 -->
<a href="javascript:;" class="prev sprites"></a>
<a href="javascript:;" class="next sprites"></a>
<!-- 指示器 -->
<div class="indicator">
<span></span>
<span></span>
<span class="active"></span>
<span></span>
<span></span>
</div>
</div>
</div>
</div>
<!-- 新鲜好物 -->
<div class="xtx_goods_new xtx_panel">
<div class="wrapper">
<!-- 面板头部 -->
<div class="xtx_panel_header">
<h3>新鲜好物<small>新鲜出炉 品质靠谱</small></h3>
<a href="javascript:;" class="more">
查看全部<i class="sprites"></i>
</a>
</div>
<!-- 商品列表 -->
<div class="xtx_panel_goods_1">
<a href="javascript:;">
<img src="./uploads/new_goods_1.jpg" alt="">
<span class="name">睿米无线吸尘器F8</span>
<span class="price"><small>¥</small>899</span>
</a>
<a href="javascript:;">
<img src="./uploads/new_goods_2.jpg" alt="">
<span class="name">智能环绕3D空调</span>
<span class="price"><small>¥</small>1299</span>
</a>
<a href="javascript:;">
<img src="./uploads/new_goods_3.jpg" alt="">
<span class="name">广东软软糯米煲仔饭</span>
<span class="price"><small>¥</small>129</span>
</a>
<a href="javascript:;">
<img src="./uploads/new_goods_4.jpg" alt="">
<span class="name">罗西机械智能手表</span>
<span class="price"><small>¥</small>3399</span>
</a>
</div>
</div>
</div>
<!-- 人气推荐 -->
<div class="xtx_goods_popular xtx_panel">
<div class="wrapper">
<!-- 面板头部 -->
<div class="xtx_panel_header">
<h3>人气推荐<small>人气爆款 不容错过</small></h3>
</div>
<!-- 商品列表 -->
<div class="xtx_panel_goods_1">
<a href="javascript:;">
<img src="./uploads/popular_1.jpg">
<span class="title">特惠推荐</span>
<span class="alt">我猜得到 你的需要</span>
</a>
<a href="./index-hot.html">
<img src="./uploads/popular_2.jpg">
<span class="title">爆款推荐</span>
<span class="alt">人气好物推荐</span>
</a>
<a href="./index-one.html">
<img src="./uploads/popular_3.jpg">
<span class="title">场景使用一站买全</span>
<span class="alt">编辑精心整理推荐</span>
</a>
<a href="javascript:;">
<img src="./uploads/popular_4.jpg">
<span class="title">领券中心</span>
<span class="alt">发现更多超值优惠券</span>
</a>
</div>
</div>
</div>
<!-- 热门品牌 -->
<div class="xtx_goods_brand xtx_panel">
<div class="wrapper">
<div class="xtx_panel_header">
<h3>热门品牌<small>国际经典 品质保证</small></h3>
<div class="page-bar">
<a href="javascript:;" class="prev sprites"></a>
<a href="javascript:;" class="next sprites active"></a>
</div>
</div>
<!-- 商品列表 -->
<div class="xtx_goods">
<ul>
<li>
<a href="./index-brand.html">
<img src="./uploads/brand_goods_1.jpg" alt="">
</a>
<a href="./brand-list.html">
<img src="./uploads/brand_goods_2.jpg" alt="">
</a>
<a href="javascript:;">
<img src="./uploads/brand_goods_3.jpg" alt="">
</a>
<a href="javascript:;">
<img src="./uploads/brand_goods_4.jpg" alt="">
</a>
<a href="javascript:;">
<img src="./uploads/brand_goods_5.jpg" alt="">
</a>
</li>
</ul>
</div>
</div>
</div>
<!-- 分类商品 -->
<div class="xtx_goods_category xtx_panel">
<div class="wrapper">
<!-- 生鲜 -->
<div class="xtx_panel_header">
<h3>生鲜</h3>
<a href="javascript:;" class="more">
查看全部<i class="sprites"></i>
</a>
<div class="tabs-bar">
<a href="javascript:;" class="active">水果</a>
<a href="javascript:;">蔬菜</a>
<a href="javascript:;">肉禽蛋</a>
<a href="javascript:;">裤装</a>
<a href="javascript:;">衬衫</a>
<a href="javascript:;">内衣</a>
</div>
</div>
<!-- 商品列表 -->
<div class="xtx_panel_goods_2">
<ul class="clearfix">
<li>
<a href="javascript:;">
<img src="./uploads/fresh_goods_cover.jpg" alt="">
</a>
<div class="label">
<span>生鲜馆</span>
<span>全场3件8折</span>
</div>
</li>
<li>
<!-- 商品图片 -->
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_1.jpg" alt="">
</div>
</a>
<!-- 商品信息 -->
<div class="meta">
<p class="name">美威 智利原味三文鱼排 240g/袋 4片装</p>
<p class="flag">海鲜年货</p>
<p class="price"><small>¥</small>59</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_2.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">红功夫 麻辣小龙虾1.5kg 4-6钱/25-32只</p>
<p class="flag">火锅食材</p>
<p class="price"><small>¥</small>71.9</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_3.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">三都港 冷冻无公害黄花鱼 700g 2条 袋装</p>
<p class="flag">海鲜水产</p>
<p class="price"><small>¥</small>49.9</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_4.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">渔公码头 大连鲜食入味 即食海参 辽参刺参 调味海</p>
<p class="flag">海鲜年货</p>
<p class="price"><small>¥</small>899</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_5.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">越南进口白心火龙果4个 装 标准果 单果400-550g </p>
<p class="flag"></p>
<p class="price"><small>¥</small>29</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_6.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">广西沃柑 柑橘1.5kg</p>
<p class="flag">新鲜水果</p>
<p class="price"><small>¥</small>59</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_7.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">进口 牛油果 6个装 单果重约130-180g</p>
<p class="flag">新鲜水果</p>
<p class="price"><small>¥</small>39.9</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/fresh_goods_8.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">泰国进口山竹5A级 500g </p>
<p class="flag">新鲜水果</p>
<p class="price"><small>¥</small>29.9</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
</ul>
</div>
<!-- 服饰 -->
<div class="xtx_panel_header">
<h3>服饰</h3>
<a href="javascript:;" class="more">
查看全部<i class="sprites"></i>
</a>
<div class="tabs-bar">
<a href="javascript:;" class="active">行李箱</a>
<a href="javascript:;">男士包袋</a>
<a href="javascript:;">女士包袋</a>
<a href="javascript:;">钱包及小提袋</a>
<a href="javascript:;">男鞋</a>
<a href="javascript:;">女鞋</a>
<a href="javascript:;">拖鞋</a>
</div>
</div>
<!-- 商品列表 -->
<div class="xtx_panel_goods_2">
<ul class="clearfix">
<li>
<a href="javascript:;">
<img src="./uploads/clothes_goods_cover.jpg" alt="">
</a>
<div class="label">
<span>服饰馆</span>
<span>3折狂欢</span>
</div>
</li>
<li>
<!-- 商品图片 -->
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/clothes_goods_1.jpg" alt="">
</div>
</a>
<!-- 商品信息 -->
<div class="meta">
<p class="name">人本秋季厚底帆布鞋 韩版低帮增高学生</p>
<p class="flag"></p>
<p class="price"><small>¥</small>55</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/clothes_goods_2.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">迪士尼真皮针扣表带宽度 14-16mm规格双色压纹 女表带</p>
<p class="flag">海鲜年货</p>
<p class="price"><small>¥</small>20.9</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/clothes_goods_3.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">三都港 冷冻无公害黄花鱼 700g 2条 袋装</p>
<p class="flag">海鲜水产</p>
<p class="price"><small>¥</small>209</p>
</div>
<!-- 其它 -->
<div class="extra">
<a href="javascript:;">
<span>找相似</span>
<span>发现现多宝贝></span>
</a>
</div>
</li>
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