Web APIs——案例

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 复制代码
<!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 复制代码
<!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>
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            <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>
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        </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&gt;</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&gt;</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&gt;</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&gt;</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&gt;</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&gt;</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&gt;</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&gt;</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 -->
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      <li><a href="javascript:;" data-name="brand">热门品牌</a></li>
      <li><a href="javascript:;" data-name="topic">最新专题</a></li>
      <li><a href="javascript:;" id="backTop"><i class="sprites"></i>顶部</a></li>
    </ul>
  </div>
  <script>
    // 第一大模块,页面滑动可以显示和隐藏
    (function () {
      // 获取元素
      const entry = document.querySelector('.xtx_entry')
      const elevator = document.querySelector('.xtx-elevator')
      // 1. 当页面滚动大于 300像素,就显示 电梯导航
      // 2. 给页面添加滚动事件
      window.addEventListener('scroll', function () {
        // 被卷去的头部大于 300 
        const n = document.documentElement.scrollTop
        // if (n >= 300) {
        //   elevator.style.opacity = 1
        // } else {
        //   elevator.style.opacity = 0
        // }
        // 简写
        elevator.style.opacity = n >= entry.offsetTop ? 1 : 0
      })

      // 点击返回页面顶部
      const backTop = document.querySelector('#backTop')
      backTop.addEventListener('click', function () {
        // 可读写
        // document.documentElement.scrollTop = 0
        // window.scrollTo(x, y)
        window.scrollTo(0, 0)
      })
    })();

    // 第二第三都放到另外一个执行函数里面
    (function () {
      // 2. 点击页面可以滑动 
      const list = document.querySelector('.xtx-elevator-list')
      list.addEventListener('click', function (e) {
        // console.log(11)
        if (e.target.tagName === 'A' && e.target.dataset.name) {
          // 排他思想  
          // 先移除原来的类active 
          // 先获取这个active的对象
          const old = document.querySelector('.xtx-elevator-list .active')
          // console.log(old)
          // 判断 如果原来有active类的对象,就移除类,如果开始就没有对象,就不删除,所以不报错
          if (old) old.classList.remove('active')
          // 当前元素添加 active 
          e.target.classList.add('active')
          // 获得自定义属性  new   topic 
          // console.log(e.target.dataset.name)
          // 根据小盒子的自定义属性值 去选择 对应的大盒子
          // console.log(document.querySelector(`.xtx_goods_${e.target.dataset.name}`).offsetTop)
          // 获得对应大盒子的 offsetTop
          const top = document.querySelector(`.xtx_goods_${e.target.dataset.name}`).offsetTop
          // 让页面滚动到对应的位置
          document.documentElement.scrollTop = top

        }
      })


      // 3. 页面滚动,可以根据大盒子选 小盒子 添加 active 类
      window.addEventListener('scroll', function () {
        //  3.1  先移除类 
        // 先获取这个active的对象
        const old = document.querySelector('.xtx-elevator-list .active')
        // console.log(old)
        // 判断 如果原来有active类的对象,就移除类,如果开始就没有对象,就不删除,所以不报错
        if (old) old.classList.remove('active')
        // 3.2 判断页面当前滑动的位置,选择小盒子

        // 获取4个大盒子
        const news = document.querySelector('.xtx_goods_new')
        const popular = document.querySelector('.xtx_goods_popular')
        const brand = document.querySelector('.xtx_goods_brand')
        const topic = document.querySelector('.xtx_goods_topic')
        const n = document.documentElement.scrollTop
        if (n >= news.offsetTop && n < popular.offsetTop) {
          // 选择第一个小盒子
          document.querySelector('[data-name=new]').classList.add('active')
        } else if (n >= popular.offsetTop && n < brand.offsetTop) {
          document.querySelector('[data-name=popular]').classList.add('active')
        } else if (n >= brand.offsetTop && n < topic.offsetTop) {
          document.querySelector('[data-name=brand]').classList.add('active')
        } else if (n >= topic.offsetTop) {
          document.querySelector('[data-name=topic]').classList.add('active')
        }
      })

    })();

      // let n = 10
      // n = 20
  </script>
</body>

</html>
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