HTML5+CSS3前端入門教程---從0開始通過一個商城例項手把手教你學習PC端和移動端頁面開發第11章有路網移動端主頁實戰
本教程案例線上演示
免費配套視訊教程
教程配套原始碼資源
本章目標
LESS
1.什麼是less
Less 是一門 CSS 預處理語言,它擴充套件了 CSS 語言,增加了變數、Mixin、巢狀等特性。Less的語法更簡潔,可以被翻譯為CSS。
在vs code安裝less的編譯外掛
安裝外掛Easy LESS
,如下圖所示
有了這個後,可以在編輯器新建less檔案,字尾名是.less
,儲存後會自動編譯成css
2. 變數
less可以宣告變數,在其它地方直接引用。
@background-color: #ffffff; @text-color: #1A237E; p{ background-color: @background-color; color: @text-color; padding: 15px; } ul{ background-color: @background-color; } li{ color: @text-color; }
將其編譯成 CSS
程式碼如下:
p{
background-color: #ffffff;
color: #1A237E;
padding: 15px;
}
ul{
background-color: #ffffff;
}
li{
color: #1A237E;
}
現在我們要切換二者的值,也就是黑色的背景和白色的文字,我們只需要修改兩個變數的值就可以了,而不是手動的去修改每個值。
3. Mixins
Less
允許我們將常用的樣式,打包封裝到 class
或 id
選擇器中。 其它地方可以方便的引用。
#circle{ background-color: #4CAF50; border-radius: 100%; } #small-circle{ width: 50px; height: 50px; #circle } #big-circle{ width: 100px; height: 100px; #circle }
將其轉換成 CSS
程式碼如下
#circle {
background-color: #4CAF50;
border-radius: 100%;
}
#small-circle {
width: 50px;
height: 50px;
background-color: #4CAF50;
border-radius: 100%;
}
#big-circle {
width: 100px;
height: 100px;
background-color: #4CAF50;
border-radius: 100%;
}
如果只用於樣式打包,而不出現在css程式碼中,那麼請在它的後面加上括號:
#circle(){
background-color: #4CAF50;
border-radius: 100%;
}
#small-circle{
width: 50px;
height: 50px;
#circle
}
#big-circle{
width: 100px;
height: 100px;
#circle
}
此時編譯成 CSS
:
#small-circle {
width: 50px;
height: 50px;
background-color: #4CAF50;
border-radius: 100%;
}
#big-circle {
width: 100px;
height: 100px;
background-color: #4CAF50;
border-radius: 100%;
}
Mixin
另一個比較酷的功能就是它支援傳入引數,下面這個例子就為 circle
傳入一個指定寬高的引數,預設是 25px。 這將建立一個 25×25的小圓和一個 100×100 的大圓。
#circle(@size: 25px){
background-color: #4CAF50;
border-radius: 100%;
width: @size;
height: @size;
}
#small-circle{
#circle
}
#big-circle{
#circle(100px)
}
轉換成 CSS
:
#small-circle {
background-color: #4CAF50;
border-radius: 100%;
width: 25px;
height: 25px;
}
#big-circle {
background-color: #4CAF50;
border-radius: 100%;
width: 100px;
height: 100px;
}
4. 巢狀
巢狀可用於以與頁面的HTML結構相匹配的方式構造樣式表,同時減少了衝突的機會。下面是一個無序列表的例子。
ul{
background-color: #03A9F4;
padding: 10px;
list-style: none;
li{
background-color: #fff;
border-radius: 3px;
margin: 10px 0;
}
}
編譯成 CSS
程式碼:
ul {
background-color: #03A9F4;
padding: 10px;
list-style: none;
}
ul li {
background-color: #fff;
border-radius: 3px;
margin: 10px 0;
}
就像在其它高階語言中一樣, Less
的變數根據範圍接受它們的值。如果在指定範圍內沒有關於變數值的宣告, less
會一直往上查詢,直至找到離它最近的宣告。
回到 CSS
中來,我們的 li
標籤將有白色的文字,如果我們在 ul
標籤中宣告 @text-color
規則。
@text-color: #000000;
ul{
@text-color: #fff;
background-color: #03A9F4;
padding: 10px;
list-style: none;
li{
color: @text-color;
border-radius: 3px;
margin: 10px 0;
}
}
編譯生成的 CSS
程式碼如下:
ul {
background-color: #03A9F4;
padding: 10px;
list-style: none;
}
ul li {
color: #ffffff;
border-radius: 3px;
margin: 10px 0;
}
5. 運算
你可以對數值和顏色進行基本的數學運算。比如說我們想要兩個緊鄰的 div
標籤,第二個標籤是第一個標籤的兩倍寬並且擁有不同的背景色。
@div-width: 100px;
@color: #03A9F4;
div{
height: 50px;
display: inline-block;
}
#left{
width: @div-width;
background-color: @color;
}
#right{
width: @div-width * 2;
background-color: @color;
}
編譯成 CSS
如下:
div {
height: 50px;
display: inline-block;
}
#left {
width: 100px;
background-color: #03a9f4;
}
#right {
width: 200px;
background-color: #03a9f4;
}
vw單位
vw是css的一個屬性,和px,rem等類似,屬於長度單位。
在瀏覽器中, 1 vw = viewport 的寬度 /100
根據這個特性,vw 可以幫助我們實現移動端自適應佈局,其優點在於所見即所得,甚至優於rem,因為完全不用使用額外的計算。
推薦和sass、less這種css預處理語言一起使用,因為其可以定義變數及函式,會在使用vw上提供巨大幫助。
@vv:7.5vw;
.circle{
width: 100/@vv;
height: 100/@vv;
border: 1px solid red;
border-radius: 50%;
font-size: 16/@vv;
text-align: center;
line-height: 100/@vv;
}
header.clear{
width: 100%;
height: 80/@vv;
font-size: 42/@vv;
background: #ededed;
line-height: 80/@vv;
text-align: center;
}
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>vw佈局練習</title>
<link href="less/style.css" rel="stylesheet" type="text/css">
</head>
<body>
<header class="clear">
這是header
</header>
<div class="circle">
circle
</div>
</body>
</html>
下面三張圖分別是在iphone 6|7|8 和ihone 6P|7P|8P 以及ipad Pro中的表現
原理
以設計稿為750為例,假設viewport代表視窗寬度
750 => viewport
7.5 => viewport/100
//得到
1vw => 7.5
// 元素list 寬為300px
300 => 300/7.5 vw
//得到
@vv = 7.5vw
300 => 300/@vv
阿里圖示庫iconfont使用
話不多說 進入官網 https://www.iconfont.cn/
搜尋你想要的 ,比如【我的】
出來以後加入購物車
點選購物車
點選新增至專案 這時你如果沒登入的話 ,會讓你登陸隨便選擇一個登陸方式比如 github
登陸成功之後你可以選擇新建也可以選擇老的專案
確定好之後會是這樣一個頁面,然後下載至本地
下載後解壓會是一些這樣的檔案
然後像我這樣把字型檔案和css檔案拿到你的專案裡
看下效果
移動端首頁製作
頂部搜尋框
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="iconfont/iconfont.css">
<link rel="stylesheet" href="less/style.css">
</head>
<body>
<div class="com-header-area">
<div class="search-box">
<span class="iconfont icon-sousuo"></span>
<input type="text" placeholder="書名、作者、出版社、ISBN、文具">
</div>
</div>
</body>
</html>
less
@vv:3.75vw;
/*預設樣式重置(css reset)*/
*{
margin: 0;
font-size: 12/@vv; /* 中文字型大小的最小值 */
/* font-family: xx; 也可以設定字型 */
}
ol,ul {
list-style: none; /* 去除列表樣式 */
padding: 0;
margin: 0;
}
a {
color: #464646;
text-decoration: none;
}
a:hover {
color: #f60;
text-decoration: underline;
}
.com-header-area{
background-color: #f0f0f0;
padding: 6/@vv 10/@vv;
.search-box{
background-color: #fff;
display: flex;
align-items: center;
input{
border: 0;
padding: 6/@vv 0;
width: 100%;
}
span{
font-size: 12/@vv;
}
}
}
熱門搜尋
html
<div class="com-content">
<ul class="hot-search">
<li class="hot">熱門搜尋:</li>
<li><a href="#">高等數學</a></li>
<li><a href="#">高等數學</a></li>
<li><a href="#">高等數學</a></li>
<li><a href="#">高等數學</a></li>
</ul>
</div>
css
.com-content{
background-color:#e1e5ee;
.hot-search{
display: flex;
align-items: center;
background-color: #fff;
padding: 2/@vv;
li{
margin: 0 4/@vv;
&.hot{
color: orange;
}
a{
color: #ccc;
}
}
}
}
輪播圖
html
<div class="slide">
<img src="img/slide.jpg">
</div>
css
.slide {
img {
width : 375/@vv;
height: 187.5/@vv;
}
}
保證條款
html
<div class="guarantee-g">
<span class="guarantee-span"><span class="check">√</span>保證正品</span>
<span class="guarantee-span"><span class="check">√</span>保證低價</span>
<span class="guarantee-span"><span class="check">√</span>24小時發貨</span>
<span class="guarantee-span"><span class="check">√</span>無理由退貨</span>
</div>
css
.guarantee-g {
display : flex;
justify-content: center;
background : #fff;
.guarantee-span {
margin : 6/@vv;
.check {
color: red;
}
}
}
五大模組
html
<div class="tab">
<a href="#"><img src="img/classify.jpg">分類搜尋</a>
<a href="#"><img src="img/classify.jpg">分類搜尋</a>
<a href="#"><img src="img/classify.jpg">分類搜尋</a>
<a href="#"><img src="img/classify.jpg">分類搜尋</a>
<a href="#"><img src="img/classify.jpg">分類搜尋</a>
</div>
css
.tab {
display : flex;
justify-content: space-around;
background : #fff;
a {
display : flex;
flex-direction: column;
align-items : center;
padding : 6/@vv;
img {
width : 26/@vv;
height: 26/@vv;
}
}
}
中欄廣告
html
<div class="bookList">
<div>
<a href="#"><img style="width:100%;" src="img/ico_index.gif"></a>
</div>
</div>
推薦圖書
html
<div class="bookList">
<div>
<a href="#"><img style="width:100%;" src="img/ico_index.gif"></a>
</div>
<div class="book-items">
<div class="item">
<span class=book_recommend>推薦圖書</span>
<span class="left-arrow">您喜歡的都在這裡</span>
<a class="span-more">更多</a>
</div>
</div>
</div>
css
.book-items {
background: #fff;
color : #757070;
.item {
line-height: 42/@vv;
display : flex;
font-weight: bold;
.book_recommend {
font-size : 14/@vv;
margin-left: 14/@vv;
}
.left-arrow {
margin-left: 20/@vv;
}
a {
margin-left : auto;
margin-right: 20/@vv;
}
}
}
推薦圖書列表
html
<div class="list-recommend">
<ul>
<li>
<a href="#">
<div class="book-img">
<img alt="阿彌陀佛麼麼噠" src="img/book.jpg">
</div>
<div class="bookName">阿彌陀佛麼麼噠</div>
<div class="price">
<span>有路價 ¥15.00</span>
</div>
<div class="priceVip">
<span>VIP價 ¥14.30</span>
</div>
</a>
</li>
<li><a href="#">
<div class="book-img"><img alt="乖.摸摸頭" src="img/book.jpg"></div>
<div class="bookName">乖.摸摸頭</div>
<div class="price">
<span>有路價 ¥14.00</span>
</div>
<div class="priceVip">
<span>VIP價 ¥13.30</span>
</div>
</a></li>
<li><a href="#">
<div class="book-img"><img alt="好嗎好的" src="img/book.jpg"></div>
<div class="bookName">好嗎好的</div>
<div class="price">
<span>有路價 ¥15.00</span>
</div>
<div class="priceVip">
<span>VIP價 ¥14.30</span>
</div>
</a></li>
</ul>
</div>
css
.list-recommend ul {
display: flex;
li {
display : flex;
flex-direction: column;
align-items: center;
flex : 1;
img {
max-width : 80/@vv;
margin-bottom: 10/@vv;
}
.priceVip {
color: #f28181;
}
}
}
換一換
html
<div class="book-refresh">
<a class="a_recommend_change" href="#"><span>換一換</span></a>
</div>
css
.book-refresh {
display : flex;
justify-content: center;
line-height : 40/@vv;
}
特色教材
html
<div class="book-items">
<div class="item">
<span class=book_recommend>特色教材</span>
<span class="left-arrow">大學裡受歡迎的書</span>
</div>
</div>
特色教材列表
html
<div class="bookInfo">
<ul>
<li class="bi_li">
<div class="bi-l">
<img src="img/car.jpg" alt="汽車理論(第5版)">
</div>
<div class="bi-r">
<a href="/#">
<div class="name">汽車理論(第5版)</div>
</a>
<div class="author">餘志生</div>
<div class="price">
<span>有路價:</span>
<span>¥14.00</span>
<span>39折</span>
</div>
<div class="price priceVip">
<span>VIP 價:</span>
<span class="Vip">
¥13.30
</span>
<span>37折</span></div>
<div class="price">
<span>團購價:</span>
<span>
¥11.20
</span>
<span>31折</span></div>
</div>
</li>
<li class="bi_li">
<div class="bi-l">
<img src="img/car.jpg" alt="汽車理論(第5版)">
</div>
<div class="bi-r">
<a href="/#">
<div class="name">汽車理論(第5版)</div>
</a>
<div class="author">餘志生</div>
<div class="price">
<span>有路價:</span>
<span>¥14.00</span>
<span>39折</span>
</div>
<div class="price priceVip">
<span>VIP 價:</span>
<span class="Vip">
¥13.30
</span>
<span>37折</span></div>
<div class="price">
<span>團購價:</span>
<span>
¥11.20
</span>
<span>31折</span></div>
</div>
</li>
<li class="bi_li">
<div class="bi-l">
<img src="img/car.jpg" alt="汽車理論(第5版)">
</div>
<div class="bi-r">
<a href="/#">
<div class="name">汽車理論(第5版)</div>
</a>
<div class="author">餘志生</div>
<div class="price">
<span>有路價:</span>
<span>¥14.00</span>
<span>39折</span>
</div>
<div class="price priceVip">
<span>VIP 價:</span>
<span class="Vip">
¥13.30
</span>
<span>37折</span></div>
<div class="price">
<span>團購價:</span>
<span>
¥11.20
</span>
<span>31折</span></div>
</div>
</li>
</ul>
</div>
css
.bookInfo {
font-size: 14/@vv;
.bi_li {
display: flex;
padding: 10 / @vv;
align-items: center;
.bi-l img {
max-height: 90 / @vv;
width: 80 / @vv;
}
.bi-r {
margin-left: 12 / @vv;
.priceVip {
color: #f28181;
}
.price {
display: flex;
line-height: 14 / @vv;
span {
flex: 1 1 auto;
margin-left: 6 / @vv;
}
span:first-child {
margin-left: 0;
}
span:last-child {
color: #f28181;
border-color: #f28181;
display: flex;
align-items: center;
padding: 0 6 / @vv;
font-weight: 400;
border: 0.5/ @vv solid #f28181;
border-radius: 4 / @vv;
}
}
}
}
}
底部導航
html
<div class="footer_nav">
<div class="footer-tab">
<a class="footer_nav_a" href="#"><i class="iconfont icon-fangdajing"></i>首頁</a>
<a class="footer_nav_a" href="#"><i class="iconfont icon-fangdajing"></i>我要賣書</a>
<a class="footer_nav_a" href="#"><i class="iconfont icon-fangdajing"></i>購物車</a>
<a class="footer_nav_a" href="#"><i class="iconfont icon-fangdajing"></i>我的有路</a>
</div>
</div>
css
.footer_nav {
width : 100%;
position : fixed;
bottom : 0;
background-color: #fcfcfc;
z-index : 99;
.footer-tab {
display : flex;
justify-content: space-between;
a {
height : 50/@vv;
display : flex;
flex-direction: column;
justify-content: center;
align-items : center;
flex : 1;
.icon-fangdajing{
font-size: 26/@vv;
}
}
}
}
完整程式碼
html
<!DOCTYPE html>
<html lang="en">
<head>
<meta
charset="UTF-8"
content="width=device-width, minimum-scale=1.0,initial-scale=1.0, maximum-scale=1.0, user-scalable=no"
id="viewport"
name="viewport"
/>
<title>Title</title>
<link href="iconfont/iconfont.css" rel="stylesheet" />
<link href="less/style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="com-header-area">
<div class="search-box">
<span class="iconfont icon-sousuo"></span>
<input
type="text"
placeholder="書名、作者、出版社、ISBN、文具"
value=""
/>
</div>
</div>
<div class="com-content">
<div class="hot-search">
<ul>
<li><span class="hot">熱門搜尋:</span></li>
<li><a>高等數學</a></li>
<li><a>高等數學</a></li>
<li><a>高等數學</a></li>
<li><a>高等數學</a></li>
</ul>
</div>
<div class="slide">
<img src="img/slide.jpg">
</div>
<div class="guarantee-g">
<span class="guarantee-span"><span class="check">√</span>保證正品</span>
<span class="guarantee-span"><span class="check">√</span>保證低價</span>
<span class="guarantee-span"><span class="check">√</span>24小時發貨</span>
<span class="guarantee-span"><span class="check">√</span>無理由退貨</span>
</div>
<div class="tab">
<a href="#"><img src="img/classify.jpg">分類搜尋</a>
<a href="#"><img src="img/classify.jpg">分類搜尋</a>
<a href="#"><img src="img/classify.jpg">分類搜尋</a>
<a href="#"><img src="img/classify.jpg">分類搜尋</a>
<a href="#"><img src="img/classify.jpg">分類搜尋</a>
</div>
<div class="bookList">
<div>
<a href="#"><img style="width:100%;" src="img/ico_index.gif"></a>
</div>
<div class="book-items">
<div class="item">
<span class=book_recommend>推薦圖書</span>
<span class="left-arrow">您喜歡的都在這裡</span>
<a class="span-more">更多</a>
</div>
<div class="list-recommend">
<ul>
<li>
<a href="#">
<div class="book-img">
<img alt="阿彌陀佛麼麼噠" src="img/book.jpg">
</div>
<div class="bookName nape">阿彌陀佛麼麼噠</div>
<div class="price nape cost">
<span>有路價 ¥15.00</span>
</div>
<div class="priceVip nape cost">
<span>VIP價 ¥14.30</span>
</div>
</a>
</li>
<li><a href="#">
<div class="book-img"><img alt="乖.摸摸頭" src="img/book.jpg"></div>
<div class="bookName nape">乖.摸摸頭</div>
<div class="price nape cost">
<span>有路價 ¥14.00</span>
</div>
<div class="priceVip nape cost">
<span>VIP價 ¥13.30</span>
</div>
</a></li>
<li><a href="#">
<div class="book-img"><img alt="好嗎好的" src="img/book.jpg"></div>
<div class="bookName nape">好嗎好的</div>
<div class="price nape cost">
<span>有路價 ¥15.00</span>
</div>
<div class="priceVip nape cost">
<span>VIP價 ¥14.30</span>
</div>
</a></li>
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<a class="a_recommend_change" href="#"><span>換一換</span></a>
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<span class=book_recommend>特色教材</span>
<span class="left-arrow">大學裡受歡迎的書</span>
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<ul>
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<img src="img/car.jpg" alt="汽車理論(第5版)">
</div>
<div class="bi-r">
<a href="/#">
<div class="name">汽車理論(第5版)</div>
</a>
<div class="author">餘志生</div>
<div class="price">
<span>有路價:</span>
<span>¥14.00</span>
<span class="discount">39折</span>
</div>
<div class="price priceVip">
<span>VIP 價:</span>
<span class="Vip">
¥13.30
</span>
<span class="discount">37折</span></div>
<div class="price">
<span>團購價:</span>
<span>
¥11.20
</span>
<span class="discount">31折</span></div>
</div>
</li>
<li class="bi_li">
<div class="bi-l">
<img src="img/car.jpg" alt="汽車理論(第5版)">
</div>
<div class="bi-r">
<a href="/#">
<div class="name">汽車理論(第5版)</div>
</a>
<div class="author">餘志生</div>
<div class="price">
<span>有路價:</span>
<span>¥14.00</span>
<span class="discount">39折</span>
</div>
<div class="price priceVip">
<span>VIP 價:</span>
<span class="Vip">
¥13.30
</span>
<span class="discount">37折</span></div>
<div class="price">
<span>團購價:</span>
<span>
¥11.20
</span>
<span class="discount">31折</span></div>
</div>
</li>
<li class="bi_li">
<div class="bi-l">
<img src="img/car.jpg" alt="汽車理論(第5版)">
</div>
<div class="bi-r">
<a href="/#">
<div class="name">汽車理論(第5版)</div>
</a>
<div class="author">餘志生</div>
<div class="price">
<span>有路價:</span>
<span>¥14.00</span>
<span class="discount">39折</span>
</div>
<div class="price priceVip">
<span>VIP 價:</span>
<span class="Vip">
¥13.30
</span>
<span class="discount">37折</span></div>
<div class="price">
<span>團購價:</span>
<span>
¥11.20
</span>
<span class="discount">31折</span></div>
</div>
</li>
</ul>
</div>
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