目录
1. rem基础
2.媒体查询
2.1 语法规范
2.2 媒体查询+rem
2.3 引入资源（理解）
3. less基础
3.1 维护css的弊端
3.2 less介绍
3.3 less变量
3.4 less编译
3.5 less嵌套
3.6 less运算
4. rem适配方案
4.1 rem实际开发
4.2 技术使用
4.3 rem+媒体查询+less
5. 苏宁网首页案例制作
6. rem适配方案2
1. rem基础
2.媒体查询
2.1 语法规范
/* 媒体查询一般按照从大到小或从小到大的顺序 */
/* 样式具有层叠性 */
/* screen and 不能省略 */
/* 数字后面必须跟单位,and后面要跟空格 */
@media screen and (max-width:539px) {
body {
background-color: blue;
}
}
@media screen and (min-width:540px) {
body {
background-color: green;
}
}
@media screen and (min-width:970px) {
body {
background-color: red;
}
}2.2 媒体查询+rem
@media screen and (min-width:320px) {
html {
font-size: 50px;
}
}
@media screen and (min-width:640px) {
html {
font-size: 100px;
}
}
.top {
height: 1rem;
font-size: .5rem;
background-color: green;
color: #fff;
text-align: center;
line-height: 1rem;
}2.3 引入资源（理解）
<!-- 媒体查询最好从小到大写 -->
<!-- 引入资源就是针对不同屏幕尺寸,调用不同的css文件 -->
<link rel="stylesheet" href="style320.css" media="screen and (min-width:320px)">
<link rel="stylesheet" href="style640.css" media="screen and (min-width:640px)">3. less基础
3.1 维护css的弊端
3.2 less介绍
3.3 less变量
3.4 less编译
3.5 less嵌套
3.6 less运算
除法运算要加小括号才能算
4. rem适配方案
4.1 rem实际开发
4.2 技术使用
4.3 rem+媒体查询+less
5. 苏宁网首页案例制作
将样式文件导入样式文件中
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="css/normalize.css">
<link rel="stylesheet" href="css/index.css">
<title>Document</title>
</head>
<body>
<!-- 顶部搜索框 -->
<div class="search-content">
<a href="#" class="classify"></a>
<div class="search">
<form action="">
<input type="search" value="厨卫保暖季">
</form>
</div>
<a href="#" class="login">登录</a>
</div>
<!-- banner 部分 -->
<div class="banner">
<img src="upload/banner.gif" alt="">
</div>
<!-- 广告部分 -->
<div class="ad">
<a href="#"><img src="upload/ad1.gif" alt=""></a>
<a href="#"><img src="upload/ad2.gif" alt=""></a>
<a href="#"><img src="upload/ad3.gif" alt=""></a>
</div>
<!-- nav -->
<nav>
<a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
<a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
<a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
<a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
<a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
<a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
<a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
<a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
<a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
<a href="#"><img src="upload/nav1.png" alt=""><span>爆款手机</span></a>
</nav>
</body>
</html>common.less
// 设置常见屏幕尺寸，修改里面的html文字大小
a {
text-decoration: none;
}
html {
// pc端也可以打开
font-size: 50px;
}
// 本次定义划分的份数为15
@no: 15;
@media screen and (min-width: 320px) {
html {
font-size: (320px / @no);
}
}
@media screen and (min-width:360px) {
html {
font-size: (360px / @no);
}
}
// 375 iphone 678
@media screen and (min-width:375px) {
html {
font-size: (375px / @no);
}
}
@media screen and (min-width:384px) {
html {
font-size: (384px / @no);
}
}
@media screen and (min-width:400px) {
html {
font-size: (400px / @no);
}
}
@media screen and (min-width:414px) {
html {
font-size: (375px / @no);
}
}
@media screen and (min-width:424px) {
html {
font-size: (424px / @no);
}
}
@media screen and (min-width:480px) {
html {
font-size: (480x / @no);
}
}
@media screen and (min-width:540px) {
html {
font-size: (540px / @no);
}
}
@media screen and (min-width:720px) {
html {
font-size: (720px / @no);
}
}
@media screen and (min-width:750px) {
html {
font-size: (750px / @no);
}
}index.less
// 将样式文件导入样式文件中
@import "common";
body {
min-width: 320px;
width: 15rem;
margin: 0 auto;
line-height: 1.5;
font-family: Arial, Helvetica, sans-serif;
background: #f2f2f2;
}
// search-content
@baseFont: 50rem;
.search-content {
display: flex;
position: fixed;
top: 0;
left: 50%;
transform: translate(-50%);
width: 15rem;
height: (88rem / @baseFont);
background-color: #ffcc01;
.classify {
width: (44 / @baseFont);
height: (70 / @baseFont);
background: url(../images/classify.png);
background-size: (44 / @baseFont) (70 / @baseFont);
margin: (11 / @baseFont) (25 / @baseFont) (7 / @baseFont) (24 / @baseFont);
}
.search {
flex: 1;
input {
// 去掉输入时的边框效果
outline: none;
width: 100%;
border: 0;
height: (66 / @baseFont);
border-radius: (33 / @baseFont);
background-color: #fff2cc;
margin-top: (12 / @baseFont);
font-size: (25 / @baseFont);
color: #757575;
padding-left: (55 / @baseFont);
}
}
.login {
width: (75 / @baseFont);
height: (70 / @baseFont);
margin: (10 / @baseFont);
font-size: (25 / @baseFont);
text-align: center;
color: #fff;
line-height: (70 / @baseFont);
}
}
// banner
.banner {
width: (750 / @baseFont);
height: (368 / @baseFont);
img {
width: 100%;
height: 100%;
}
}
// ad
.ad {
display: flex;
a {
flex: 1;
img {
width: 100%;
}
}
}
// nav
nav {
width: (750 / @baseFont);
a {
float: left;
width: (150 / @baseFont);
height: (140 / @baseFont);
text-align: center;
img {
display: block;
width: (82 / @baseFont);
height: (82 / @baseFont);
margin: (10 / @baseFont) auto 0;
}
span {
display: block;
font-size: (25 / @baseFont);
color: #333;
margin-top: 5px;
}
}
}6. rem适配方案2
flexible.js + rem
插件 cssrem 可以将px转换成rem；
这个插件默认的html文字大小 cssroot 16px；
在设置中搜索设置 cssroot ，将工作区的font size 设置为想要的。
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no,initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="css/normalize.css">
<link rel="stylesheet" href="css/index.css">
<!-- 引入我们的flexible.js 文件 -->
<script src="js/flexible.js"></script>
<title>Document</title>
</head>
<body>
<div class="search-content">
<a href="#" class="classify"></a>
<div class="search">
<form action="">
<input type="search" value="rem适配方案2很开心哦">
</form>
</div>
<a href="#" class="login">登录</a>
</div>
</body>
</html>index.css
body {
min-width: 320px;
max-width: 750px;
/* flexible 给我们划分了 10 等份 */
width: 10rem;
margin: 0 auto;
line-height: 1.5;
font-family: Arial, Helvetica;
background: #f2f2f2;
}
a {
text-decoration: none;
font-size: .333333rem;
}
/* 这个插件默认的html文字大小 cssroot 16px */
/*
img {
width: 5.125rem;
height: 4rem;
width: 1rem;
width: 1.093333rem;
height: 1rem;
} */
/* 如果我们的屏幕超过了 750px 那么我们就按照 750设计稿来走 不会让我们页面超过750px */
@media screen and (min-width: 750px) {
html {
font-size: 75px !important;
}
}
/* search-content */
.search-content {
display: flex;
position: fixed;
top: 0;
left: 50%;
transform: translateX(-50%);
width: 10rem;
height: 1.173333rem;
background-color: #FFC001;
}
.classify {
width: .586667rem;
height: .933333rem;
margin: .146667rem .333333rem .133333rem;
background: url(../images/classify.png) no-repeat;
background-size: .586667rem .933333rem;
}
.search {
flex: 1;
}
.search input {
outline: none;
border: 0;
width: 100%;
height: .88rem;
font-size: .333333rem;
background-color: #FFF2CC;
margin-top: .133333rem;
border-radius: .44rem;
color: #757575;
padding-left: .733333rem;
}
.login {
width: 1rem;
height: .933333rem;
margin: .133333rem;
color: #fff;
text-align: center;
line-height: .933333rem;
font-size: .333333rem;
}
