一、移动WEB开发之rem适配布局
1. 移动WEB开发rem适配布局导读
2. rem单位
<!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>rem单位</title>
<style>
html {
/* font-size: 14px; */
font-size: 12px;
}
div {
font-size: 12px;
width: 15rem;
height: 15rem;
background-color: purple;
}
p {
/* 1.em是相对于父元素的文字大小来说的 */
/* 10em就是10*12=120px */
/* width: 10em;
height: 10em; */
/* 2.rem相对于 html元素字体大小来说的 */
/* 10*14=140px */
width: 10rem;
height: 10rem;
background-color: pink;
/* 3.rem的优点就是可以通过修改html里面的文字大小来改变页面中元素的大小 可以整体控制 */
}
</style>
</head>
<body>
<div>
<p></p>
</div>
</body>
</html>
3. 媒体查询语法简介
<!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>媒体查询</title>
<style>
/* 这句话的意思就是：在我们屏幕上 并且 最大的宽度是800像素 设置我们想要的样式 */
/* max-width 小于等于800 */
/* 媒体查询可以根据不同的屏幕尺寸再改变不同的样式 */
@media screen and (max-width: 800px) {
body {
background-color: pink;
}
}
@media screen and (max-width: 500px) {
body {
background-color: purple;
}
}
</style>
</head>
<body>
</body>
</html>
4. 媒体查询案例背景变色
<!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>媒体查询案例修改背景颜色</title>
<style>
/* 1.媒体查询一般按照从大到小或者从小到大的顺序来 */
/* 2.小于540px 页面的背景颜色变为蓝色 */
@media screen and (max-width: 539px) {
body {
background-color: blue;
}
}
/* 3. 540~969 我们的页面颜色改为绿色 */
/* @media screen and (min-width: 540px) and (max-width: 969px) {
body {
background-color: green;
}
} */
@media screen and (min-width: 540px) {
body {
background-color: green;
}
}
/* 4. 大于等于970 我们页面的颜色变为红色 */
@media screen and (min-width: 970px) {
body {
background-color: red;
}
}
/* 5. screen还有 and 必须带上 不能省略的 */
/* 6.我们的数字后面必须跟单位 970px 这个px 不能省略的 */
</style>
</head>
<body>
</body>
</html>
5. 媒体查询+rem实现元素动态大小变化
<!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>媒体查询+rem实现元素动态变化</title>
<style>
/* 清除内外边距 */
* {
margin: 0;
padding: 0;
}
/* 定死了
html {
font-size: 100px;
} */
/* 从小到大的顺序 */
@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;
}
</style>
</head>
<body>
<div class="top">购物车</div>
</body>
</html>
6. 媒体查询引入资源
<!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>引入资源</title>
<style>
/* 当我们屏幕大于等于 640px以上的，我们让div一行显示2个 */
/* 当我们屏幕小于640 我们让div一行显示 一个 */
/* 一个建议： 我们媒体查询最好的方法是从小到大 */
/* 引入资源就是 针对于不同的屏幕尺寸 调用不同的css文件 */
</style>
<link rel="stylesheet" href="style320.css" media="screen and (min-width: 320px)">
<link rel="stylesheet" href="style640.css" media="screen and (min-width: 640px)">
</head>
<body>
<div>1</div>
<div>2</div>
</body>
</html>
7. CSS的弊端
<!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>CSS的缺点</title>
<style>
html {
font-size: 50px;
}
img {
/* width: 82px;
height: 82px; */
/* width: 1.64rem;
height: 1.64rem; */
/* width: 82/50; */
}
div {
background-color: pink;
}
p {
background-color: pink;
}
span {
background-color: pink;
}
</style>
</head>
<body>
<div></div>
<p></p>
<span></span>
</body>
</html>
8. LESS简介以及使用变量
less介绍
<!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>less的使用</title>
<link rel="stylesheet" href="my.css">
</head>
<body>
<div>
我的颜色也是粉色
</div>
</body>
</html>
my.less
less变量
9. less编译easy less插件
less编译
easy less插件
10. less嵌套
<!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>less嵌套</title>
<style>
/* .header {}
.header a {} */
</style>
<link rel="stylesheet" href="nest.css">
</head>
<body>
<div class="header">
<a href="#">文字</a>
</div>
<div class="nav">
<div class="logo">老紫薯道山</div>
</div>
</body>
</html>
nest.less
11. less运算
<!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>less运算</title>
<link rel="stylesheet" href="count.css">
</head>
<body>
<div>sfa</div>
</body>
</html>
count.less
12. rem适配方案原理
rem实际开发适配方案
rem适配方案技术使用（市场主流）
13. rem最终适配方案
rem实际开发适配方案1
<!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>rem适配方案</title>
<style>
@media screen and (min-width: 320px) {
html {
font-size: 21.33px;
}
}
@media screen and (min-width: 750px) {
html {
font-size: 50px;
}
}
div {
width: 2rem;
height: 2rem;
background-color: pink;
}
/* 1. 首先我们选一套标准尺寸 750为准 */
/* 2. 我们用屏幕尺寸除以 我们划分的份数 得到了 html 里面的文字大小 但是我们知道不同屏幕下得到的文字大小是不一样的 */
/* 3. 页面元素的rem值 = 页面元素在750像素下的px值 / html 里面的文字大小 */
</style>
</head>
<body>
<div></div>
</body>
</html>
style320.css
div {
width: 100%;
height: 100px;
}
div:nth-child(1) {
background-color: pink;
}
div:nth-child(2) {
background-color: purple;
}
style640.css
div {
float: left;
width: 50%;
height: 100px;
}
div:nth-child(1) {
background-color: pink;
}
div:nth-child(2) {
background-color: purple;
}
14. 苏宁首页案例制作
苏宁网移动端首页制作步骤
（1）苏宁首页common.less制作
（2）苏宁首页import导入样式
（3）苏宁首页body样式设置
（4）苏宁首页search-content模块布局
（5）苏宁首页search-content内容布局
（6）苏宁首页search模块制作
（7）苏宁首页banner和广告模块制作
（8）苏宁首页nav部分制作
实现代码
<!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,maximum-scale=1.0,user-scalable=0" />
<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.classify -->
<a href="#" class="classify"></a>
<div class="search">
<form action="">
<input type="search" value="厨卫保暖季 每千减百">
</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模块 -->
<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
index.less
normalize.css
/*! normalize.css v5.0.0 | MIT License | github.com/necolas/normalize.css */
/**
* 1. Change the default font family in all browsers (opinionated).
* 2. Correct the line height in all browsers.
* 3. Prevent adjustments of font size after orientation changes in
* IE on Windows Phone and in iOS.
*/
/* Document
========================================================================== */
html {
font-family: sans-serif;
/* 1 */
line-height: 1.15;
/* 2 */
-ms-text-size-adjust: 100%;
/* 3 */
-webkit-text-size-adjust: 100%;
/* 3 */
}
/* Sections
========================================================================== */
/**
* Remove the margin in all browsers (opinionated).
*/
body {
margin: 0;
}
/**
* Add the correct display in IE 9-.
*/
article,
aside,
footer,
header,
nav,
section {
display: block;
}
/**
* Correct the font size and margin on `h1` elements within `section` and
* `article` contexts in Chrome, Firefox, and Safari.
*/
h1 {
font-size: 2em;
margin: 0.67em 0;
}
/* Grouping content
========================================================================== */
/**
* Add the correct display in IE 9-.
* 1. Add the correct display in IE.
*/
figcaption,
figure,
main {
/* 1 */
display: block;
}
/**
* Add the correct margin in IE 8.
*/
figure {
margin: 1em 40px;
}
/**
* 1. Add the correct box sizing in Firefox.
* 2. Show the overflow in Edge and IE.
*/
hr {
box-sizing: content-box;
/* 1 */
height: 0;
/* 1 */
overflow: visible;
/* 2 */
}
/**
* 1. Correct the inheritance and scaling of font size in all browsers.
* 2. Correct the odd `em` font sizing in all browsers.
*/
pre {
font-family: monospace, monospace;
/* 1 */
font-size: 1em;
/* 2 */
}
/* Text-level semantics
========================================================================== */
/**
* 1. Remove the gray background on active links in IE 10.
* 2. Remove gaps in links underline in iOS 8+ and Safari 8+.
*/
a {
background-color: transparent;
/* 1 */
-webkit-text-decoration-skip: objects;
/* 2 */
}
/**
* Remove the outline on focused links when they are also active or hovered
* in all browsers (opinionated).
*/
a:active,
a:hover {
outline-width: 0;
}
/**
* 1. Remove the bottom border in Firefox 39-.
* 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
*/
abbr[title] {
border-bottom: none;
/* 1 */
text-decoration: underline;
/* 2 */
text-decoration: underline dotted;
/* 2 */
}
/**
* Prevent the duplicate application of `bolder` by the next rule in Safari 6.
*/
b,
strong {
font-weight: inherit;
}
/**
* Add the correct font weight in Chrome, Edge, and Safari.
*/
b,
strong {
font-weight: bolder;
}
/**
* 1. Correct the inheritance and scaling of font size in all browsers.
* 2. Correct the odd `em` font sizing in all browsers.
*/
code,
kbd,
samp {
font-family: monospace, monospace;
/* 1 */
font-size: 1em;
/* 2 */
}
/**
* Add the correct font style in Android 4.3-.
*/
dfn {
font-style: italic;
}
/**
* Add the correct background and color in IE 9-.
*/
mark {
background-color: #ff0;
color: #000;
}
/**
* Add the correct font size in all browsers.
*/
small {
font-size: 80%;
}
/**
* Prevent `sub` and `sup` elements from affecting the line height in
* all browsers.
*/
sub,
sup {
font-size: 75%;
line-height: 0;
position: relative;
vertical-align: baseline;
}
sub {
bottom: -0.25em;
}
sup {
top: -0.5em;
}
/* Embedded content
========================================================================== */
/**
* Add the correct display in IE 9-.
*/
audio,
video {
display: inline-block;
}
/**
* Add the correct display in iOS 4-7.
*/
audio:not([controls]) {
display: none;
height: 0;
}
/**
* Remove the border on images inside links in IE 10-.
*/
img {
border-style: none;
}
/**
* Hide the overflow in IE.
*/
svg:not(:root) {
overflow: hidden;
}
/* Forms
========================================================================== */
/**
* 1. Change the font styles in all browsers (opinionated).
* 2. Remove the margin in Firefox and Safari.
*/
button,
input,
optgroup,
select,
textarea {
font-family: sans-serif;
/* 1 */
font-size: 100%;
/* 1 */
line-height: 1.15;
/* 1 */
margin: 0;
/* 2 */
}
/**
* Show the overflow in IE.
* 1. Show the overflow in Edge.
*/
button,
input {
/* 1 */
overflow: visible;
}
/**
* Remove the inheritance of text transform in Edge, Firefox, and IE.
* 1. Remove the inheritance of text transform in Firefox.
*/
button,
select {
/* 1 */
text-transform: none;
}
/**
* 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
* controls in Android 4.
* 2. Correct the inability to style clickable types in iOS and Safari.
*/
button,
html [type="button"],
/* 1 */
[type="reset"],
[type="submit"] {
-webkit-appearance: button;
/* 2 */
}
/**
* Remove the inner border and padding in Firefox.
*/
button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
border-style: none;
padding: 0;
}
/**
* Restore the focus styles unset by the previous rule.
*/
button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
outline: 1px dotted ButtonText;
}
/**
* Change the border, margin, and padding in all browsers (opinionated).
*/
fieldset {
border: 1px solid #c0c0c0;
margin: 0 2px;
padding: 0.35em 0.625em 0.75em;
}
/**
* 1. Correct the text wrapping in Edge and IE.
* 2. Correct the color inheritance from `fieldset` elements in IE.
* 3. Remove the padding so developers are not caught out when they zero out
* `fieldset` elements in all browsers.
*/
legend {
box-sizing: border-box;
/* 1 */
color: inherit;
/* 2 */
display: table;
/* 1 */
max-width: 100%;
/* 1 */
padding: 0;
/* 3 */
white-space: normal;
/* 1 */
}
/**
* 1. Add the correct display in IE 9-.
* 2. Add the correct vertical alignment in Chrome, Firefox, and Opera.
*/
progress {
display: inline-block;
/* 1 */
vertical-align: baseline;
/* 2 */
}
/**
* Remove the default vertical scrollbar in IE.
*/
textarea {
overflow: auto;
}
/**
* 1. Add the correct box sizing in IE 10-.
* 2. Remove the padding in IE 10-.
*/
[type="checkbox"],
[type="radio"] {
box-sizing: border-box;
/* 1 */
padding: 0;
/* 2 */
}
/**
* Correct the cursor style of increment and decrement buttons in Chrome.
*/
[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
height: auto;
}
/**
* 1. Correct the odd appearance in Chrome and Safari.
* 2. Correct the outline style in Safari.
*/
[type="search"] {
-webkit-appearance: textfield;
/* 1 */
outline-offset: -2px;
/* 2 */
}
/**
* Remove the inner padding and cancel buttons in Chrome and Safari on macOS.
*/
[type="search"]::-webkit-search-cancel-button,
[type="search"]::-webkit-search-decoration {
-webkit-appearance: none;
}
/**
* 1. Correct the inability to style clickable types in iOS and Safari.
* 2. Change font properties to `inherit` in Safari.
*/
::-webkit-file-upload-button {
-webkit-appearance: button;
/* 1 */
font: inherit;
/* 2 */
}
/* Interactive
========================================================================== */
/*
* Add the correct display in IE 9-.
* 1. Add the correct display in Edge, IE, and Firefox.
*/
details,
/* 1 */
menu {
display: block;
}
/*
* Add the correct display in all browsers.
*/
summary {
display: list-item;
}
/* Scripting
========================================================================== */
/**
* Add the correct display in IE 9-.
*/
canvas {
display: inline-block;
}
/**
* Add the correct display in IE.
*/
template {
display: none;
}
/* Hidden
========================================================================== */
/**
* Add the correct display in IE 10-.
*/
[hidden] {
display: none;
}
rem适配方案2
头部制作
<!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, user-scalable=no,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0">
<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="电脑超级品牌日">
</form>
</div>
<a href="#" class="login">登录</a>
</div>
</body>
</html>
normalize.css
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;
/* 因为大部分链接都是25px */
font-size: .3333rem;
}
/* 这个插件默认的html文字大小 cssroot 16px (1rem)*/
/* 修改插件里面默认的文字大小 */
/* img {
width: 5.125rem;
height: 4rem;
width: 1rem;
width: 1.0933rem;
height: 1rem;
} */
/* 如果我们的屏幕超过了 750px 那么我们就把它限定死 不让页面超过750px */
@media screen and (min-width: 750px) {
html {
font-size: 75px !important;
}
}
/* search-content */
/* 发现和屏幕一样宽 因为flexible是根据当前屏幕来划分的，它会给我们自动生成一个html里面的文字大小 */
.search-content {
display: flex;
position: fixed;
top: 0;
left: 50%;
transform: translateX(-50%);
width: 10rem;
height: 1.1733rem;
background-color: #FFC001;
}
.classify {
width: .5867rem;
height: .9333rem;
/* background-color: pink; */
margin: .1467rem .3333rem .1333rem;
background: url(../images/classify.png) no-repeat;
background-size: .5867rem .9333rem;
}
.search {
flex: 1;
/* background-color: purple; */
}
.search input {
/* 去掉边框 */
outline: none;
border: 0;
width: 100%;
height: .88rem;
font-size: .3333rem;
background-color: #FFF2CC;
margin-top: .1333rem;
border-radius: .44rem;
color: #757575;
padding-left: .7333rem;
}
.login {
width: 1rem;
height: .9333rem;
margin: .1333rem;
/* background-color: pink; */
color: #fff;
text-align: center;
line-height: .9333rem;
font-size: .3333rem;
}
js: flexible.js
扫一扫
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
