事件流
事件流和两个阶段说明
事件捕获
事件冒泡
阻止冒泡
解绑事件
事件委托
案例
<!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>tab栏切换</title>
<style>
* {
margin: 0;
padding: 0;
}
.tab {
width: 590px;
height: 340px;
margin: 20px;
border: 1px solid #e4e4e4;
}
.tab-nav {
width: 100%;
height: 60px;
line-height: 60px;
display: flex;
justify-content: space-between;
}
.tab-nav h3 {
font-size: 24px;
font-weight: normal;
margin-left: 20px;
}
.tab-nav ul {
list-style: none;
display: flex;
justify-content: flex-end;
}
.tab-nav ul li {
margin: 0 20px;
font-size: 14px;
}
.tab-nav ul li a {
text-decoration: none;
border-bottom: 2px solid transparent;
color: #333;
}
.tab-nav ul li a.active {
border-color: #e1251b;
color: #e1251b;
}
.tab-content {
padding: 0 16px;
}
.tab-content .item {
display: none;
}
.tab-content .item.active {
display: block;
}
</style>
</head>
<body>
<div class="tab">
<div class="tab-nav">
<h3>每日特价</h3>
<ul>
<li><a class="active" href="javascript:;" data-id="0">精选</a></li>
<li><a href="javascript:;" data-id="1">美食</a></li>
<li><a href="javascript:;" data-id="2">百货</a></li>
<li><a href="javascript:;" data-id="3">个护</a></li>
<li><a href="javascript:;" data-id="4">预告</a></li>
</ul>
</div>
<div class="tab-content">
<div class="item active"><img src="./images/tab00.png" alt="" /></div>
<div class="item"><img src="./images/tab01.png" alt="" /></div>
<div class="item"><img src="./images/tab02.png" alt="" /></div>
<div class="item"><img src="./images/tab03.png" alt="" /></div>
<div class="item"><img src="./images/tab04.png" alt="" /></div>
</div>
</div>
<script>
const ul = document.querySelector('.tab-nav ul')
ul.addEventListener('click',function(e){
if(e.target.tagName === 'A'){
document.querySelector('.tab-nav .active').classList.remove('active')
// this 指向 ul，不能使用this
e.target.classList.add('active')
// 大盒子模块
const i = +e.target.dataset.id
document.querySelector('.tab-content .active').classList.remove('active')
document.querySelector(`.tab-content .item:nth-child(${i+1}`).classList.add('active')
}
})
</script>
</body>
</html>
其他事件
页面加载事件
<!DOCTYPE html>
<html lang="zh-CN">
<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>
<script>
// 等待页面所有资源加载完毕，就会执行回调函数
window.addEventListener('load', function () {
const btn = document.querySelector('button')
btn.addEventListener('click', function () {
alert(11)
})
})
</script>
</head>
<body>
<button>点击</button>
</body>
</html>
<!DOCTYPE html>
<html lang="zh-CN">
<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>
<script>
// 等待页面所有资源加载完毕，就会执行回调函数
document.addEventListener('DOMContentLoaded', function () {
const btn = document.querySelector('button')
btn.addEventListener('click', function () {
alert(11)
})
})
</script>
</head>
<body>
<button>点击</button>
</body>
</html>
页面滚动事件
案例
<!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>
<li>
<a href="javascript:;">
<div class="img-box">
<img src="./uploads/clothes_goods_4.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">ONLY夏季新款高腰宽松 七分阔腿裙裤休闲裤</p>
<p class="flag"></p>
<p class="price"><small>￥</small>274.5</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_5.jpg" alt="">
</div>
</a>
<div class="meta">
<p class="name">拉夫劳伦t恤男正品 </p>
<p class="flag">圆领短袖</p>
<p class="price"><small>￥</small>99</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">
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吃这些美食才不算辜负自己
<small>餐厨起居洗护好物</small>
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<span class="price"><small>￥</small>29.9起</span>
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<i class="sprites"></i>1800
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吃这些美食才不算辜负自己
<small>餐厨起居洗护好物</small>
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<span class="price"><small>￥</small>29.9起</span>
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<i class="sprites"></i>1220
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<i class="sprites"></i>1800
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<i class="sprites"></i>1220
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吃这些美食才不算辜负自己
<small>餐厨起居洗护好物</small>
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<span class="price"><small>￥</small>29.9起</span>
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<span class="like">
<i class="sprites"></i>1220
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<span class="view">
<i class="sprites"></i>1800
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<i class="sprites"></i>1220
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