一、CSS的应用之_雪碧图
CSS Sprite也叫CSS精灵图、CSS雪碧图，是一种网页图片应用处理方式。它允许你将一个页面涉及到的所有零星图片都包含到一张大图中去
优点
- 减少图片的字节
- 减少网页的http请求，从而大大的提高页面的性能
原理
- 通过background-image引入背景图片
- 通过background-position把背景图片移动到自己需要的位置
<!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>
.icon1{
display: block;
width: 45px;
height: 70px;
background-image: url("./1.png");
background-position: -20px 1px;
}
.icon2{
display: block;
width: 55px;
height: 70px;
background-image: url("1.png");
background-position: -230px -291px;
}
.icon3{
display: block;
width: 55px;
height: 70px;
background-image: url("1.png");
background-position: -302px -291px;
}
</style>
</head>
<body>
<i class="icon1"></i>
<i class="icon2"></i>
<i class="icon3"></i>
</body>
</html>二、CSS的应用之_字体图标
我们会经常用到一些图标。但是我们在使用这些图标时，往往会遇到失真的情况，而且图片数量很多的话，页面加载就越慢。所以，我们可以使用字体图标的方式来显示图标，既解决了失真的问题，也解决了图片占用资源的问题
常用字体图标库：阿里字体图标库
优点
- 轻量性：加载速度快，减少http请求
- 灵活性：可以利用CSS设置大小颜色等
- 兼容性：网页字体支持所有现代浏览器，包括IE低版本
使用字体图标
- 注册账号并登录
- 选取图标或搜索图标
- 添加购物车
- 下载代码
- 解压完成后，把iconfont.css和iconfont.ttt文件复制到当前文件目录下
- 然后，打开demo_index.html，选择font-class引用
<!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>
<link rel="stylesheet" href="./iconfont.css">
<style>
.icon-xingbie{
font-size: 40px;
color: red;
margin: 10px;
}
.icon-xingming{
font-size: 30px;
margin: 50px;
}
.icon-nianling{
font-size: 100px;
color: greenyellow;
margin: 100px;
}
</style>
</head>
<body>
<span class="iconfont icon-xingbie"></span>
<br>
<span class="iconfont icon-xingming"></span>
<br>
<span class="iconfont icon-nianling"></span>
<br>
</body>
</html>三、CSS的应用之_滑动门
大家在网页中经常会见到这样一种导航效果,因为使用频率广泛,所以广大的程序员给它起了一个名字,叫做滑动门.
<!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>
<link rel="stylesheet" href="./iconfont.css">
<style>
*{
margin: 0;
padding: 0;
}
body{
background-color: #fff;
}
.container{
width: 234px;
height: 420px;
background-color: rgba(105,101,101,.6);
padding: 20px 0;
margin: 100px;
position: relative;
}
.container ul{
list-style-type: none;
}
.container ul li{
width: 100%;
height: 42px;
line-height: 42px;
text-align: left;
padding-left: 10px;
box-sizing: border-box;
}
.container >ul >li:hover{
background-color: #ff6700;
}
.container ul li a{
text-decoration: none;
font-size: 16px;
color: #fff;
}
.container .iconfont{
font-size: 18px;
color: #fff;
position: absolute;
right: 10px;
}
.list-box{
width: 992px;
height: 460px;
background-color: #fff;
position: absolute;
left: 234px;
top: 0;
border: 1px solid rgba(0,0,0,0.18);
box-shadow: 0px 1px 3px #e0e0e0;
box-sizing: border-box;
border-left: 0;
display: none;
}
.container ul li:hover>.list-box{
display: block;
}
.box ul li{
width: 240px;
height: 76px;
float: left;
}
.box ul li img{
width: 40px;
height: 40px;
padding-top: 20px;
}
.text{
color: rgba(0,0,0,1);
font-size: 16px;
}
.box ul li a:hover>.text{
color: #ff6700;
}
</style>
</head>
<body>
<div class="container">
<ul>
<li>
<a href="#">手机</a>
<span class="iconfont icon-jinrujiantou"></span>
<div class="list-box">
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
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<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
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</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
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<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
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<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
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<ul>
<li>
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<span class="text">Redmi 12C</span>
</a>
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</ul>
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<div class="box">
<ul>
<li>
<a href="#">
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<span class="text">Redmi 12C</span>
</a>
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</ul>
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<div class="box">
<ul>
<li>
<a href="#">
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<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
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<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
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<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
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</ul>
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<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
<a href="#">
<img src="./1.webp" alt="">
<span class="text">Redmi 12C</span>
</a>
</li>
</ul>
</div>
</div>
</li>
<li>
<a href="#">电脑</a>
<span class="iconfont icon-jinrujiantou"></span>
<div class="list-box">
<div class="box">
<ul>
<li>
<a href="#">
<img src="./2.webp" alt="">
<span class="text">小米笔记本 ProX 14</span>
</a>
</li>
</ul>
</div>
<div class="box">
<ul>
<li>
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