3.其它事件
- 页面加载事件
<!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>页面加载事件</title>
<!-- script按理是不能写在上面的,代码从上往下执行,获取button 但是button都还没执行,所以无法显示弹窗 -->
<!-- 我们通过页面的加载事件来解决 -->
<script>
/* // 等待页面所有资源加载完毕,就回去执行回调函数
window.addEventListener('load', function () {
const btn = document.querySelector('button')
btn.addEventListener('click', function () {
alert(11)
})
})
// 也可以针对某个资源绑定load事件,比如某个图很大,加载得很慢
// 可以不用非得写window
img.addEentListener('load',function() {
// 等待图片加载完毕,再去执行里面的代码
}) */
// 初始的html文档,如标签等加载完成之后
document.addEventListener('DOMContentLoaded', function () {
const btn = document.querySelector('button')
btn.addEventListener('click', function () {
alert(11)
})
})
</script>
<!-- 一般我们都是很少写在上面的,因为要多写一个函数,但是如果你的代码添加了很多资源,必须把所有资源加载完毕才行,就可以用到这个页面加载事件 -->
</head>
<body>
<button>点击</button>
</body>
</html>
- 元素滚动事件
<!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>页面滚动事件</title>
<style>
body {
padding-top: 100px;
height: 6666px;
}
div {
display: none;
margin: 100px;
/* overflow: hidden/auto/scroll */
overflow: scroll;
/* h200+w200+bd */
height: 200px;
width: 200px;
border: 1px solid #000;
}
</style>
</head>
<body>
<div>
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茉莉荔枝冰柠水
茉莉荔枝冰柠水
茉莉荔枝冰柠水
</div>
<script>
const div = document.querySelector('div')
// 页面滚动事件
window.addEventListener('scroll', function () {
// console.log('我滚了');
// 想知道页面到底滚动了多少像素,被卷去了多少 scrollTop
// 获取html元素的写法
// document.documentElement
// console.log(document.documentElement.scrollTop)
// 大于等于100的时候显示,小于100的时候隐藏
const n = document.documentElement.scrollTop
if (n >= 100) {
div.style.display = 'block'
} else {
div.style.dispaly = 'none'
}
})
/* const div = document.querySelector('div')
div.addEventListener('scroll', function () {
// console.log(111)
// scrollTop被卷去的头部
console.log(div.scrollTop)
}) */
</script>
</body>
</html>
<!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>scrollTop细节</title>
<style>
body {
height: 3000px;
}
</style>
</head>
<body>
<script>
// 赋值的时候不带单位 800
// 可读写就是可取值也能赋值
document.documentElement.scrollTop = 800
window.addEventListener('scroll', function () {
// 在scroll事件里面获取被卷去的距离 如果写在外面就不能保证每滑动一段距离就改变一次值
const n = document.documentElement.scrollTop
// 得到的是什么数据? 数字型 不带单位
console.log(n)
})
</script>
</body>
</html>
综合案例
<!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">
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<li><a href="javascript:;" id="backTop"><i class="sprites"></i>顶部</a></li>
</ul>
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<script>
// 获取元素
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) {
// opacity里面肯定添加了transition,淡入淡出效果
elevator.style.opacity = 1
} else {
elevator.style.opacity = 0
} */
// 三元运算符
elevator.style.opacity = n >= 300 ? 1 : 0
})
// 点击返回页面顶部
// 和上面的滚动没有关系
const backTop = document.querySelector('#backTop')
backTop.addEventListener('click', function () {
// 可读写
// document.documentElement.scrollTop = 0
// 另外一种方法:window.scrollTo(x, y)
// 它们的区别是一个是属性赋值,一个是方法赋值的形式。scrollTo可以x轴滚动也可以y轴滚动
// window.scrollTo(200, 0)
// window.scrollTo(0, 200)
window.scrollTo(0, 0)
})
</script>
</body>
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- 页面尺寸事件
<!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>页面尺寸事件</title>
<style>
div {
display: inline-block;
/* width: 200px; */
height: 200px;
background-color: pink;
/* 检测宽高的时候包括padding,不包括border */
padding: 10px;
border: 20px solid red;
}
</style>
</head>
<body>
<div>dsodhofhq'qp[qjfg[gjq[j[j[hj['h['</div>
<script>
// 新属性:clientwidth,clientheight 获取元素可见部分的宽高
// 返回的数字型
const div = document.querySelector('div')
console.log(div.clientWidth)
// resize 浏览器窗口大小发生变化的时候触发的事件
window.addEventListener('resize', function () {
console.log(1)
})
</script>
</body>
</html>
4.元素尺寸与位置
这样就能得到距离左侧,顶部的距离了。(靠自己算算不准,所以采用js更加靠谱)
学了offset之后,页面滚动大于300px再显示就不科学了,我们要让它在出现那个盒子顶部之后就开始显示导航栏 这样一来这个盒子上面的盒子再加或者再减都没有影响了
不用console.log直接在控制台检测效果也行
电梯导航改动的相关代码
因为-80~0有过渡效果,所以是滑下来的
知道需求之后,我们来写js,手动的把.header的top改成-80px,滚动到秒杀模块的时候就可以让它显示了
<!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>仿新浪固定头部</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
// 页面被卷去的头部 >= 秒杀模块的位置 offsetTop
const n = document.documentElement.scrollTop
/* if (n >= sk.offsetTop) {
header.style.top = 0
} else {
// css一定要带单位,样式这些,我们说过 acrollTop这些可以不用带单位
header.style.top = '-80px'
} */
// 三元表达式更加简洁 先算赋值符号右边的
header.style.top = n >= sk.offsetTop ? 0 : '-80px'
})
</script>
</body>
</html>
blibli导航滑动案例
核心思想:对红色线盒子采用定位的方式定位到首页,动画盒子下面,他是一个单独的盒子,故它可以单独移动,通过给红色线盒子给个transform里面的translate来实现滑动。当点完之后,红色的盒子移动到链接的位置。接下来是移动多少距离的问题,我们可以通过offsetLeft获取盒子距离左侧的距离,我们把这个距离给盒子trasform里面的translate就可以在点击之后跟着过来了。同时我们给它添加一个过渡效果,就可以慢慢过来了,再给每一个小链接绑定一个点击事件。
要获得所有的a链接,所以要用到我们的事件委托,tabs-list是a的父级,把a的点击事件委托给它的父亲就行了。
<!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>bilibili-干杯~~~</title>
<!-- 引入favicon图标 -->
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
<!-- 引入css文件 -->
<link rel="stylesheet" href="./css/index.css">
<!-- 引入字体图标文件 -->
<link rel="stylesheet" href="./fonts/iconfont.css">
</head>
<body>
<!-- 头部模块 -->
<header class="suspension">
<div class="m-navbar">
<!-- logo -->
<a href="#" class="logo">
<i class="iconfont Navbar_logo"></i>
</a>
<!-- 右侧 -->
<div class="right">
<a href="#" class="search">
<i class="iconfont ic_search_tab"></i>
</a>
<a href="#" class="face">
<img src="./images/login.png" alt="">
</a>
<div class="app-btn">
<img src="./images/download.png" alt="">
</div>
</div>
</div>
<div class="channel-menu">
<div class="tabs">
<!-- 很宽的盒子 -->
<div class="tabs-list">
<a href="#">首页</a>
<a href="#">动画</a>
<a href="#">番剧</a>
<a href="#">果蔬</a>
<a href="#">音乐</a>
<a href="#">舞蹈</a>
<a href="#">鬼畜</a>
<a href="#">吹鬼</a>
<!-- 红色线 -->
<div class="line"></div>
</div>
</div>
<div class="after">
<i class="iconfont general_pulldown_s"></i>
</div>
</div>
</header>
<!-- 主体部分 -->
<div class="m-home">
<div class="video-list">
<a href="#" class="video-item">
<div class="card">
<img src="./images/dog.jpg@480w_270h_1c" alt="">
<!-- 播放量 -->
<div class="count">
<span>
<i class="iconfont icon_shipin_bofangshu"></i>
播放量
</span>
<span>
<i class="iconfont icon_shipin_danmushu"></i>
评论数
</span>
</div>
</div>
<p class="title ellipsis-2">
315晚会能不能曝光下智能电视?N重广告、套娃会员、操作反人类,当代年轻人是怎么被智能电视逼疯的?【商业B面&牛顿】
</p>
</a>
<a href="#" class="video-item">
<div class="card">
<img src="./images/dog.jpg@480w_270h_1c" alt="">
<!-- 播放量 -->
<div class="count">
<span>
<i class="iconfont icon_shipin_bofangshu"></i>
播放量
</span>
<span>
<i class="iconfont icon_shipin_danmushu"></i>
评论数
</span>
</div>
</div>
<p class="title ellipsis-2">
315晚会能不能曝光下智能电视?N重广告、套娃会员、操作反人类,当代年轻人是怎么被智能电视逼疯的?【商业B面&牛顿】
</p>
</a>
<a href="#" class="video-item">
<div class="card">
<img src="./images/dog.jpg@480w_270h_1c" alt="">
<!-- 播放量 -->
<div class="count">
<span>
<i class="iconfont icon_shipin_bofangshu"></i>
播放量
</span>
<span>
<i class="iconfont icon_shipin_danmushu"></i>
评论数
</span>
</div>
</div>
<p class="title ellipsis-2">
315晚会能不能曝光下智能电视?N重广告、套娃会员、操作反人类,当代年轻人是怎么被智能电视逼疯的?【商业B面&牛顿】
</p>
</a>
<a href="#" class="video-item">
<div class="card">
<img src="./images/dog.jpg@480w_270h_1c" alt="">
<!-- 播放量 -->
<div class="count">
<span>
<i class="iconfont icon_shipin_bofangshu"></i>
播放量
</span>
<span>
<i class="iconfont icon_shipin_danmushu"></i>
评论数
</span>
</div>
</div>
<p class="title ellipsis-2">
315晚会能不能曝光下电视?
</p>
</a>
<a href="#" class="video-item">
<div class="card">
<img src="./images/dog.jpg@480w_270h_1c" alt="">
<!-- 播放量 -->
<div class="count">
<span>
<i class="iconfont icon_shipin_bofangshu"></i>
播放量
</span>
<span>
<i class="iconfont icon_shipin_danmushu"></i>
评论数
</span>
</div>
</div>
<p class="title ellipsis-2">
315晚会能不能曝光下智能电视?N重广告、套娃会员、操作反人类,当代年轻人是怎么被智能电视逼疯的?【商业B面&牛顿】
</p>
</a>
<a href="#" class="video-item">
<div class="card">
<img src="./images/dog.jpg@480w_270h_1c" alt="">
<!-- 播放量 -->
<div class="count">
<span>
<i class="iconfont icon_shipin_bofangshu"></i>
播放量
</span>
<span>
<i class="iconfont icon_shipin_danmushu"></i>
评论数
</span>
</div>
</div>
<p class="title ellipsis-2">
315晚会能不能曝光下智能电视?N重广告、套娃会员、操作反人类,当代年轻人是怎么被智能电视逼疯的?【商业B面&牛顿】
</p>
</a>
<a href="#" class="video-item">
<div class="card">
<img src="./images/dog.jpg@480w_270h_1c" alt="">
<!-- 播放量 -->
<div class="count">
<span>
<i class="iconfont icon_shipin_bofangshu"></i>
播放量
</span>
<span>
<i class="iconfont icon_shipin_danmushu"></i>
评论数
</span>
</div>
</div>
<p class="title ellipsis-2">
315晚会能不能曝光下智能电视?N重广告、套娃会员、操作反人类,当代年轻人是怎么被智能电视逼疯的?【商业B面&牛顿】
</p>
</a>
<a href="#" class="video-item">
<div class="card">
<img src="./images/dog.jpg@480w_270h_1c" alt="">
<!-- 播放量 -->
<div class="count">
<span>
<i class="iconfont icon_shipin_bofangshu"></i>
播放量
</span>
<span>
<i class="iconfont icon_shipin_danmushu"></i>
评论数
</span>
</div>
</div>
<p class="title ellipsis-2">
315晚会能不能曝光下智能电视?N重广告、套娃会员、操作反人类,当代年轻人是怎么被智能电视逼疯的?【商业B面&牛顿】
</p>
</a>
<a href="#" class="video-item">
<div class="card">
<img src="./images/dog.jpg@480w_270h_1c" alt="">
<!-- 播放量 -->
<div class="count">
<span>
<i class="iconfont icon_shipin_bofangshu"></i>
播放量
</span>
<span>
<i class="iconfont icon_shipin_danmushu"></i>
评论数
</span>
</div>
</div>
<p class="title ellipsis-2">
315晚会能不能曝光下智能电视?N重广告、套娃会员、操作反人类,当代年轻人是怎么被智能电视逼疯的?【商业B面&牛顿】
</p>
</a>
<a href="#" class="video-item">
<div class="card">
<img src="./images/dog.jpg@480w_270h_1c" alt="">
<!-- 播放量 -->
<div class="count">
<span>
<i class="iconfont icon_shipin_bofangshu"></i>
播放量
</span>
<span>
<i class="iconfont icon_shipin_danmushu"></i>
评论数
</span>
</div>
</div>
<p class="title ellipsis-2">
315晚会能不能曝光下智能电视?N重广告、套娃会员、操作反人类,当代年轻人是怎么被智能电视逼疯的?【商业B面&牛顿】
</p>
</a>
<a href="#" class="video-item">
<div class="card">
<img src="./images/dog.jpg@480w_270h_1c" alt="">
<!-- 播放量 -->
<div class="count">
<span>
<i class="iconfont icon_shipin_bofangshu"></i>
播放量
</span>
<span>
<i class="iconfont icon_shipin_danmushu"></i>
评论数
</span>
</div>
</div>
<p class="title ellipsis-2">
315晚会能不能曝光下智能电视?N重广告、套娃会员、操作反人类,当代年轻人是怎么被智能电视逼疯的?【商业B面&牛顿】
</p>
</a>
</div>
</div>
<!-- 底部模块 -->
<footer class="app">
<div class="btn-app">
<i class="iconfont Navbar_logo"></i>
打开App,看你感兴趣的视频
</div>
</footer>
<script>
// 1. 事件委托的方法 获取父元素 tabs-list
const list = document.querySelector('.tabs-list')
const line = document.querySelector('.line')
// 2. 给a注册事件
list.addEventListener('click', function (e) {
// 判断点击的是a 只有点击了A 才有触发效果
if (e.target.tagName === 'A') {
// console.log(11)
// 当前元素是谁 ? e.target
// 得到当前点击元素的位置
// 得到当前的链接的 offsetLeft
// console.log(e.target.offsetLeft)
// 让line盒子来进行移动
// 只动X轴就行了,因为Y轴不需要动
line.style.transform = `translateX(100px)`
// 把我们点击的a链接盒子的位置 然后移动
line.style.transform = `translateX(${e.target.offsetLeft}px)`
// transform移动的时候可以添加过渡效果 谁做动画给谁加过渡 transition 当时是在index.less里面写的
}
})
</script>
</body>
</html>
另外一个获取元素大小和尺寸的方法
这个方法和offset的区别:offset是针对的整个页面,而getBoundingClientRect()是针对的视口,它会随着页面下拉而改变四个位置的坐标,但是offset针对的真个页面,它不会随着下拉而改变坐标。
<!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>获取元素大小和位置的另外一个方法</title>
<style>
body {
height: 2000px;
}
div {
width: 200px;
height: 200px;
background-color: pink;
margin: 100px;
}
</style>
</head>
<body>
<div></div>
<script>
const div = document.querySelector('div')
// 打开之后能得到一个对象,对象里面有宽高,还有上下左右四个位置
console.log(div.getBoundingClientRect())
</script>
</body>
</html>
5.综合案例
console.log(e.target.dataset)
console.log(e.target.dataset.name)
要想点击之后,页面是滑动过去的,而不是一下子跳过去的,只用在css上面添加一句话就行
<!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 -->
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吃这些美食才不算辜负自己
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吃这些美食才不算辜负自己
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<script>
// 1. 第一大模块,页面滑动可以显示和隐藏
// 为了防止变量污染 自适应函数 (function(){剪切的内容})();
(function () {
// 获取元素
const elevator = document.querySelector('.xtx-elevator')
// 1.当页面滚动大于300像素,就显示 电梯导航
// -------- 学了offset之后,页面滚动大于300px再显示就不科学了,我们要让它在出现那个盒子顶部之后就开始显示导航栏 这样一来这个盒子上面的盒子再加或者再减都没有影响了
const xtx_entry = document.querySelector('.xtx_entry')
// 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) {
// opacity里面肯定添加了transition,淡入淡出效果
elevator.style.opacity = 1
} else {
elevator.style.opacity = 0
} */
// 三元运算符
// elevator.style.opacity = n >= 300 ? 1 : 0
// 这里就不用300了,改为entry.offsetTop,程序就更加自由了,不用担心盒子的上移或者下移,是自动检测的
elevator.style.opacity = n >= xtx_entry.offsetTop ? 1 : 0
})
// 点击返回页面顶部
// 和上面的滚动没有关系
const backTop = document.querySelector('#backTop')
backTop.addEventListener('click', function () {
// 可读写
// document.documentElement.scrollTop = 0
// 另外一种方法:window.scrollTo(x, y)
// 它们的区别是一个是属性赋值,一个是方法赋值的形式。scrollTo可以x轴滚动也可以y轴滚动
// window.scrollTo(200, 0)
// window.scrollTo(0, 200)
window.scrollTo(0, 0)
})
})();
// 第二第三个模块一起都放到另外一个执行函数里面
// 因为点击和滚动都有一样的效果
(function () {
// 2.(第二个模块)点击页面可以滑动
// 有很多小li,循环绑定很麻烦,所以我们用事件委托,获取父元素,绑定事件
const list = document.querySelector('.xtx-elevator-list')
list.addEventListener('click', function (e) {
// console.log(11);
// 在 'A'后面添加 && e.target.dataset.name 是因为点击 顶部 后会报错,而且返回顶部之后向下滑动高亮没有消失 解决办法就是 发现顶部和另外4个小a的区别是 另外4个小a具有自定义属性而 顶部 没有 所以通过选出自定义属性名的方式将 顶部 排除在外 e.target.dataset.name能获取自定义属性名的时候就为真 获得自定义属性名为null的时候就为假 (字符串除了空其它的全为真)
if (e.target.tagName === 'A' && e.target.dataset.name) {
// 排他思想
/* // 按照以前的做法: 先移除原来的类active 再在点击的a上面添加active
// 这样的做法会报错,因为它跟之前的不一样,这个一开始没有固定选定一个a添加active,所以一开始获取active的时候会显示无法获取 active
// document.querySelector('.xtx-elevator-list .active').classList.remove('active') */
// 先移除原来的类active
// 先获取这个带有active的对象
const old = document.querySelector('.xtx-elevator-list .active')
// console.log(old)
// 判断
// 如果存在就返回这个类名然后移除,如果不存在则返回null,if (old)就为假,就不执行后面的,不会报错
// 一句话可以不用写大括号
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)
// 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_new}`))
// 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(new, popular等) 添加 active 类
window.addEventListener('scroll', function () {
// 3.1 先移除类 直接复制粘贴
// 先获取这个带有active的对象
const old = document.querySelector('.xtx-elevator-list .active')
// console.log(old)
// 判断
// 如果存在就返回这个类名然后移除,如果不存在则返回null,if (old)就为假,就不执行后面的,不会报错
// 一句话可以不用写大括号
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
// 关键字不能作为变量名 new不能作为变量名
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')
// 这个没做赋值,如果赋值这样写是错的,没做赋值,比较是没问题的
const n = document.documentElement.scrollTop
if (n >= news.offsetTop && n < popular.offsetTop) {
// 选择第一个盒子
// 这个 "" 可以省略 属性选择器有中括号
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')
// 这个页面已经没有其他内容了,就用else也行,但是if else更严谨
}
})
})();
</script>
</body>
</html>
属性选择器复习
<!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>属性选择器复习</title>
<style>
/* input[value] {
color: red;
} */
/* 如果两个都没有value */
input[type=text] {
color: red;
}
</style>
</head>
<body>
<input type="text" value="223" data-id="0" data-name="andy">
<input type="password">
<script>
const input = document.querySelector('input[value')
// console.log(input)
console.log(input.dataset) // 自定义属性集合 得到一个对象
console.log(input.dataset.name) // 自定义属性集合
</script>
</body>
</html>
作业里面用的是根据索引号来进行匹配,这样做不严谨,如果中间再增添大盒子就会乱,像电梯导航这样根据自定义属性匹配大盒子的方法是科学的(通过名字找大盒子)