前端学习02

1.CSS案例

1.1 内容回顾

1.1.1 搭建骨架
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>
        body{
            margin: 0;
        }
        .sub-header{
            height: 100px;
            background-color: #b0b0b0;
        }
        .container{
            width: 1128px;
            margin: 0 auto;
        }
        .sub-header .ht{
            height: 100px;
        }
        .sub-header .logo{
            width: 234px;
            float: left;
        }
        .sub-header .menu-list{
            float: left;
        }

        .sub-header .search{
            float: right;
        }
    style>
head>
<body>
<div class="sub-header">
    <div class="container">
        <div class="ht logo">1div>
        <div class="ht menu-list">2div>
        <div class="ht search">3div>
        <div class="clear:both;">div>
    div>
div>

body>
html>
1.1.2 Logo区域
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>
        body {
            margin: 0;
        }

        .sub-header {
            height: 100px;
            background-color: #b0b0b0;
        }

        .container {
            width: 1128px;
            margin: 0 auto;
        }

        .sub-header .ht {
            height: 100px;
        }

        .sub-header .logo {
            width: 234px;
            float: left;
            border: 1px solid red;
        }

        .sub-header .logo a {
            margin-top: 22px;
            display: inline-block
        }

        .sub-header .logo a img {
            height: 56px;
            width: 56px;
        }

        .sub-header .menu-list {
            float: left;
        }

        .sub-header .search {
            float: right;
        }
    style>
head>
<body>
<div class="sub-header">
    <div class="container">
        <div class="ht logo">
            
            <a href="https://www.mi.com/">
                <img src="images/logo-mi2.png" alt="">
            a>

        div>
        <div class="ht menu-list">2div>
        <div class="ht search">3div>
        <div class="clear:both;">div>
    div>
div>

body>
html>
1.1.3 菜单部分
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>
        body {
            margin: 0;
        }

        .sub-header {
            height: 100px;
        }

        .container {
            width: 1128px;
            margin: 0 auto;
        }

        .sub-header .ht {
            height: 100px;
        }

        .sub-header .logo {
            width: 234px;
            float: left;

        }

        .sub-header .logo a {
            margin-top: 22px;
            display: inline-block
        }

        .sub-header .logo a img {
            height: 56px;
            width: 56px;
        }

        .sub-header .menu-list {
            float: left;

            line-height: 100px;
        }

        .sub-header .menu-list a{
            display: inline-block;
            padding: 0 10px;
            color: #333;
            font-size: 16px;
            text-decoration: none;
        }

        .sub-header .menu-list a:hover{
            color: #ff6700;
        }

        .sub-header .search {
            float: right;
        }
    style>
head>
<body>
<div class="sub-header">
    <div class="container">
        <div class="ht logo">
            
            <a href="https://www.mi.com/">
                <img src="images/logo-mi2.png" alt="">
            a>

        div>
        <div class="ht menu-list">
            <a href="https://www.mi.com/">Xiaomi手机a>
            <a href="https://www.mi.com/">Redmi红米a>
            <a href="https://www.mi.com/">电视a>
            <a href="https://www.mi.com/">笔记本a>
            <a href="https://www.mi.com/">平板a>
        div>
        <div class="ht search">div>
        <div class="clear:both;">div>
    div>
div>

body>
html>

1.2 案例:顶部菜单 + 二级菜单

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>
        body {
            margin: 0;
        }

        .container {
            width: 1226px;
            margin: 0 auto;
        }


        .header {
            background: #333;
        }


        .header .menu {
            float: left;
            color: white;
        }

        .header .account {
            float: right;
            color: white;
        }

        .header a {
            color: #b0b0b0;
            line-height: 40px;
            display: inline-block;
            font-size: 12px;
            margin-right: 10px;

            text-decoration: none;
        }
        .header a:hover{
            color: white;
        }

        .sub-header {
            height: 100px;
        }

        .sub-header .ht {
            height: 100px;
        }

        .sub-header .logo {
            width: 234px;
            float: left;

        }

        .sub-header .logo a {
            margin-top: 22px;
            display: inline-block
        }

        .sub-header .logo a img {
            height: 56px;
            width: 56px;
        }

        .sub-header .menu-list {
            float: left;

            line-height: 100px;
        }

        .sub-header .menu-list a {
            display: inline-block;
            padding: 0 10px;
            color: #333;
            font-size: 16px;
            text-decoration: none;
        }

        .sub-header .menu-list a:hover {
            color: #ff6700;
        }

        .sub-header .search {
            float: right;
        }
    style>
head>
<body>

<div class="header">
    <div class="container">
        <div class="menu">
            <a href="https://www.mi.com/">小米商城a>
            <a href="https://www.mi.com/">MIUIa>
            <a href="https://www.mi.com/">云服务a>
            <a href="https://www.mi.com/">有品a>
            <a href="https://www.mi.com/">开放平台a>
        div>
        <div class="account">
            <a href="https://www.mi.com/">登录a>
            <a href="https://www.mi.com/">注册a>
            <a href="https://www.mi.com/">消息通知a>
        div>
        <div style="clear: both">div>
    div>
div>

<div class="sub-header">
    <div class="container">
        <div class="ht logo">
            
            <a href="https://www.mi.com/">
                <img src="images/logo-mi2.png" alt="">
            a>

        div>
        <div class="ht menu-list">
            <a href="https://www.mi.com/">Xiaomi手机a>
            <a href="https://www.mi.com/">Redmi红米a>
            <a href="https://www.mi.com/">电视a>
            <a href="https://www.mi.com/">笔记本a>
            <a href="https://www.mi.com/">平板a>
        div>
        <div class="ht search">div>
        <div class="clear:both;">div>
    div>
div>


body>
html>
小结
  • a标签是行内标签,行内标签的高度、内外边距,默认无效。

  • 垂直方向居中

    • 本文 + line-height
    • 图片 + 边距
  • a标签默认有下划线。

  • 鼠标放上去之后hover

    .c1:hover{
        ...
    }
    a:hover{
        
    }
    
1.2.1 搭建骨架
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>
        body {
            margin: 0;
        }

        img {
            width: 100%;
            height: 100%;
        }

        .container {
            width: 1226px;
            margin: 0 auto;
        }


        .header {
            background: #333;
        }


        .header .menu {
            float: left;
            color: white;
        }

        .header .account {
            float: right;
            color: white;
        }

        .header a {
            color: #b0b0b0;
            line-height: 40px;
            display: inline-block;
            font-size: 12px;
            margin-right: 10px;

            text-decoration: none;
        }

        .header a:hover {
            color: white;
        }

        .sub-header {
            height: 100px;
        }

        .sub-header .ht {
            height: 100px;
        }

        .sub-header .logo {
            width: 234px;
            float: left;

        }

        .sub-header .logo a {
            margin-top: 22px;
            display: inline-block
        }

        .sub-header .logo a img {
            height: 56px;
            width: 56px;
        }

        .sub-header .menu-list {
            float: left;

            line-height: 100px;
        }

        .sub-header .menu-list a {
            display: inline-block;
            padding: 0 10px;
            color: #333;
            font-size: 16px;
            text-decoration: none;
        }

        .sub-header .menu-list a:hover {
            color: #ff6700;
        }

        .sub-header .search {
            float: right;
        }

        .slider .sd-img {
            width: 1226px;
            height: 460px;
        }

    style>
head>
<body>

<div class="header">
    <div class="container">
        <div class="menu">
            <a href="https://www.mi.com/">小米商城a>
            <a href="https://www.mi.com/">MIUIa>
            <a href="https://www.mi.com/">云服务a>
            <a href="https://www.mi.com/">有品a>
            <a href="https://www.mi.com/">开放平台a>
        div>
        <div class="account">
            <a href="https://www.mi.com/">登录a>
            <a href="https://www.mi.com/">注册a>
            <a href="https://www.mi.com/">消息通知a>
        div>
        <div style="clear: both">div>
    div>
div>

<div class="sub-header">
    <div class="container">
        <div class="ht logo">
            
            <a href="https://www.mi.com/">
                <img src="images/logo-mi2.png" alt="">
            a>

        div>
        <div class="ht menu-list">
            <a href="https://www.mi.com/">Xiaomi手机a>
            <a href="https://www.mi.com/">Redmi红米a>
            <a href="https://www.mi.com/">电视a>
            <a href="https://www.mi.com/">笔记本a>
            <a href="https://www.mi.com/">平板a>
        div>
        <div class="ht search">div>
        <div class="clear:both;">div>
    div>
div>

<div class="slider">
    <div class="container">
        <div class="sd-img">
            <img src="images/b1.jpeg" alt="">
        div>
    div>
div>


<div class="news">
    <div class="container">
        <div class="channel">div>
        <div class="list-item">div>
        <div class="list-item">div>
        <div class="list-item">div>
    div>
div>


body>
html>
1.2.2 案例的实现
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>
        body {
            margin: 0;
        }

        img {
            width: 100%;
            height: 100%;
        }

        .left {
            float: left;
        }

        .container {
            width: 1226px;
            margin: 0 auto;
        }


        .header {
            background: #333;
        }


        .header .menu {
            float: left;
            color: white;
        }

        .header .account {
            float: right;
            color: white;
        }

        .header a {
            color: #b0b0b0;
            line-height: 40px;
            display: inline-block;
            font-size: 12px;
            margin-right: 10px;

            text-decoration: none;
        }

        .header a:hover {
            color: white;
        }

        .sub-header {
            height: 100px;
        }

        .sub-header .ht {
            height: 100px;
        }

        .sub-header .logo {
            width: 234px;
            float: left;

        }

        .sub-header .logo a {
            margin-top: 22px;
            display: inline-block
        }

        .sub-header .logo a img {
            height: 56px;
            width: 56px;
        }

        .sub-header .menu-list {
            float: left;

            line-height: 100px;
        }

        .sub-header .menu-list a {
            display: inline-block;
            padding: 0 10px;
            color: #333;
            font-size: 16px;
            text-decoration: none;
        }

        .sub-header .menu-list a:hover {
            color: #ff6700;
        }

        .sub-header .search {
            float: right;
        }

        .slider .sd-img {
            width: 1226px;
            height: 460px;
        }

        .news{
            margin-top: 14px;
        }

        .news .channel {
            width: 228px;
            height: 164px;
            background-color: #5f5750;
            padding: 3px;
        }

        .news .channel .item {
            height: 82px;
            width: 76px;
            float: left;
            text-align: center;
        }
        .news .channel .item a{
            display: inline-block;
            font-size: 12px;
            padding-top: 18px;
            color: #fff;
            text-decoration: none;

            opacity: 0.7;
        }
        .news .channel .item a:hover{
            opacity: 1;
        }
        .news .channel .item  img{
            height: 24px;
            width: 24px;
            display: block;
            margin: 0 auto 4px;

        }

        .news .list-item {
            width: 316px;
            height: 170px;
        }

    style>
head>
<body>

<div class="header">
    <div class="container">
        <div class="menu">
            <a href="https://www.mi.com/">小米商城a>
            <a href="https://www.mi.com/">MIUIa>
            <a href="https://www.mi.com/">云服务a>
            <a href="https://www.mi.com/">有品a>
            <a href="https://www.mi.com/">开放平台a>
        div>
        <div class="account">
            <a href="https://www.mi.com/">登录a>
            <a href="https://www.mi.com/">注册a>
            <a href="https://www.mi.com/">消息通知a>
        div>
        <div style="clear: both">div>
    div>
div>

<div class="sub-header">
    <div class="container">
        <div class="ht logo">
            
            <a href="https://www.mi.com/">
                <img src="images/logo-mi2.png" alt="">
            a>

        div>
        <div class="ht menu-list">
            <a href="https://www.mi.com/">Xiaomi手机a>
            <a href="https://www.mi.com/">Redmi红米a>
            <a href="https://www.mi.com/">电视a>
            <a href="https://www.mi.com/">笔记本a>
            <a href="https://www.mi.com/">平板a>
        div>
        <div class="ht search">div>
        <div class="clear:both;">div>
    div>
div>

<div class="slider">
    <div class="container">
        <div class="sd-img">
            <img src="images/b1.jpeg" alt="">
        div>
    div>
div>


<div class="news">
    <div class="container">
        <div class="channel left">
            <div class="item">
                <a href="https://www.mi.com/">
                    <img src="images/v1.png" alt="">
                    <span>保障服务span>
                a>
            div>
           <div class="item">
                <a href="https://www.mi.com/">
                    <img src="images/v1.png" alt="">
                    <span>保障服务span>
                a>
            div>
            <div class="item">
                <a href="https://www.mi.com/">
                    <img src="images/v1.png" alt="">
                    <span>保障服务span>
                a>
            div>
            <div class="item">
                <a href="https://www.mi.com/">
                    <img src="images/v1.png" alt="">
                    <span>保障服务span>
                a>
            div>
            <div class="item">
                <a href="https://www.mi.com/">
                    <img src="images/v1.png" alt="">
                    <span>保障服务span>
                a>
            div>
            <div class="item">
                <a href="https://www.mi.com/">
                    <img src="images/v1.png" alt="">
                    <span>保障服务span>
                a>
            div>
            <div class="clear:both">div>
        div>
        <div class="list-item left" style="margin-left: 14px">
            <img src="images/w1.jpeg"/>
        div>
        <div class="list-item left" style="margin-left: 15px">
            <img src="images/w2.jpeg"/>
        div>
        <div class="list-item left" style="margin-left: 15px">
            <img src="images/w3.jpeg"/>
        div>
        <div class="clear:both">div>
    div>
div>


body>
html>
小结
  • 设置透明度

    opacity:0.5;    /* 0 ~ 1 */
    

2. CSS知识点

2.1 hover(伪类)

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>
        .c1 {
            color: red;
            font-size: 18px;
        }

        .c1:hover {
            color: green;
            font-size: 50px;
        }

        .c2 {
            height: 300px;
            width: 500px;
            border: 3px solid red;
        }

        .c2:hover {
            border: 3px solid green;
        }

        .download {
            display: none;
        }

        .app:hover .download {
            display: block;
        }
        .app:hover .title{
            color: red;
        }
    style>
head>
<body>
<div class="c1">联通div>
<div class="c2">广西div>

<div class="app">
    <div class="title">下载APPdiv>
    <div class="download">
        <img src="images/qcode.png" alt="">
    div>
div>

body>
html>

2.2 after(伪类)

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>
        .c1:after{
            content: "大帅哥";
        }
    style>
head>
<body>
    <div class="c1">吴阳军div>
    <div class="c1">梁吉宁div>
body>
html>

很重要的应用:

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>
        .clearfix:after{
            content: "";
            display: block;
            clear: both;
        }
        .item{
            float: left;
        }

    style>
head>
<body>
    <div class="clearfix">
        <div class="item">1div>
        <div class="item">2div>
        <div class="item">3div>
    div>
body>
html>

2.3 position

  • fixed
  • relative
  • absolute
1. fixed

固定在窗口的某个位置。

案例:返回顶部
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>

        .back{
            position: fixed;
            width: 60px;
            height: 60px;
            border: 1px solid red;

            right: 10px;
            bottom: 50px;
        }
    style>
head>
<body>

<div style="height: 1000px;background-color: #5f5750">div>

<div class="back">div>


body>
html>
案例:对话框
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>
        body {
            margin: 0;
        }

        .dialog {
            position: fixed;
            height: 300px;
            width: 500px;
            background-color: white;

            left: 0;
            right: 0;
            margin: 0 auto;

            top: 200px;

            z-index: 1000;
        }

        .mask {
            background-color: black;
            position: fixed;
            left: 0;
            right: 0;
            top: 0;
            bottom: 0;
            opacity: 0.7;
            z-index: 999;
        }
    style>
head>
<body>


<div style="height: 1000px">asdfasdfasddiv>


<div class="mask">div>
<div class="dialog">div>


body>
html>
2. relative和absolute
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>

        .c1{
            height: 300px;
            width: 500px;
            border: 1px solid red;
            margin: 100px;

            position: relative;
        }
        .c1 .c2{
            height: 59px;
            width: 59px;
            background-color: #00FF7F;

            position: absolute;
            right: 20px;
            bottom: 10px;
        }
    style>
head>
<body>
    <div class="c1">

        <div class="c2">div>

    div>
body>
html>
案例:小米商城下载app
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>
        body {
            margin: 0;
        }

        img {
            width: 100%;
            height: 100%;
        }

        .left {
            float: left;
        }

        .container {
            width: 1226px;
            margin: 0 auto;
        }


        .header {
            background: #333;
        }


        .header .menu {
            float: left;
            color: white;
        }

        .header .account {
            float: right;
            color: white;
        }

        .header a {
            color: #b0b0b0;
            line-height: 40px;
            display: inline-block;
            font-size: 12px;
            margin-right: 10px;

            text-decoration: none;
        }

        .header a:hover {
            color: white;
        }

        .sub-header {
            height: 100px;
        }

        .sub-header .ht {
            height: 100px;
        }

        .sub-header .logo {
            width: 234px;
            float: left;

        }

        .sub-header .logo a {
            margin-top: 22px;
            display: inline-block
        }

        .sub-header .logo a img {
            height: 56px;
            width: 56px;
        }

        .sub-header .menu-list {
            float: left;

            line-height: 100px;
        }

        .sub-header .menu-list a {
            display: inline-block;
            padding: 0 10px;
            color: #333;
            font-size: 16px;
            text-decoration: none;
        }

        .sub-header .menu-list a:hover {
            color: #ff6700;
        }

        .sub-header .search {
            float: right;
        }

        .slider .sd-img {
            width: 1226px;
            height: 460px;
        }

        .news {
            margin-top: 14px;
        }

        .news .channel {
            width: 228px;
            height: 164px;
            background-color: #5f5750;
            padding: 3px;
        }

        .news .channel .item {
            height: 82px;
            width: 76px;
            float: left;
            text-align: center;
        }

        .news .channel .item a {
            display: inline-block;
            font-size: 12px;
            padding-top: 18px;
            color: #fff;
            text-decoration: none;

            opacity: 0.7;
        }

        .news .channel .item a:hover {
            opacity: 1;
        }

        .news .channel .item img {
            height: 24px;
            width: 24px;
            display: block;
            margin: 0 auto 4px;

        }

        .news .list-item {
            width: 316px;
            height: 170px;
        }

        .app {
            position: relative
        }

        .app .download {
            position: absolute;
            height: 100px;
            width: 100px;
            display: none;
        }
        .app:hover .download{
            display: block;
        }
    style>
head>
<body>

<div class="header">
    <div class="container">
        <div class="menu">
            <a href="https://www.mi.com/">小米商城a>
            <a href="https://www.mi.com/">MIUIa>
            <a href="https://www.mi.com/">云服务a>
            <a href="https://www.mi.com/">云服务a>
            <a href="https://www.mi.com/" class="app">下载app
                <div class="download">
                    <img src="images/qcode.png" alt="">
                div>
            a>
            <a href="https://www.mi.com/">云服务a>
            <a href="https://www.mi.com/">云服务a>
            <a href="https://www.mi.com/">有品a>
            <a href="https://www.mi.com/">开放平台a>
        div>
        <div class="account">
            <a href="https://www.mi.com/">登录a>
            <a href="https://www.mi.com/">注册a>
            <a href="https://www.mi.com/">消息通知a>
        div>
        <div style="clear: both">div>
    div>
div>

<div class="sub-header">
    <div class="container">
        <div class="ht logo">
            
            <a href="https://www.mi.com/">
                <img src="images/logo-mi2.png" alt="">
            a>

        div>
        <div class="ht menu-list">
            <a href="https://www.mi.com/">Xiaomi手机a>
            <a href="https://www.mi.com/">Redmi红米a>
            <a href="https://www.mi.com/">电视a>
            <a href="https://www.mi.com/">笔记本a>
            <a href="https://www.mi.com/">平板a>
        div>
        <div class="ht search">div>
        <div class="clear:both;">div>
    div>
div>

<div class="slider">
    <div class="container">
        <div class="sd-img">
            <img src="images/b1.jpeg" alt="">
        div>
    div>
div>


<div class="news">
    <div class="container">
        <div class="channel left">
            <div class="item">
                <a href="https://www.mi.com/">
                    <img src="images/v1.png" alt="">
                    <span>保障服务span>
                a>
            div>
            <div class="item">
                <a href="https://www.mi.com/">
                    <img src="images/v1.png" alt="">
                    <span>保障服务span>
                a>
            div>
            <div class="item">
                <a href="https://www.mi.com/">
                    <img src="images/v1.png" alt="">
                    <span>保障服务span>
                a>
            div>
            <div class="item">
                <a href="https://www.mi.com/">
                    <img src="images/v1.png" alt="">
                    <span>保障服务span>
                a>
            div>
            <div class="item">
                <a href="https://www.mi.com/">
                    <img src="images/v1.png" alt="">
                    <span>保障服务span>
                a>
            div>
            <div class="item">
                <a href="https://www.mi.com/">
                    <img src="images/v1.png" alt="">
                    <span>保障服务span>
                a>
            div>
            <div class="clear:both">div>
        div>
        <div class="list-item left" style="margin-left: 14px">
            <img src="images/w1.jpeg"/>
        div>
        <div class="list-item left" style="margin-left: 15px">
            <img src="images/w2.jpeg"/>
        div>
        <div class="list-item left" style="margin-left: 15px">
            <img src="images/w3.jpeg"/>
        div>
        <div class="clear:both">div>
    div>
div>


body>
html>

2.4 border

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>

        .c1{
            height: 300px;
            width: 500px;
            border: 1px solid red;
            border-left: 3px solid #00FF7F;
            margin: 100px;
        }

    style>
head>
<body>
    <div class="c1">div>
body>
html>

透明色:

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>

        .c1{
            height: 50px;
            width: 500px;
            margin: 100px;
            background-color: #5f5750;
            border-left: 2px solid transparent;
        }

        .c1:hover{
            border-left: 2px solid red;
        }

    style>
head>
<body>
    <div class="c1">菜单div>
body>
html>

2.5 背景色

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <style>

        .c1{
            height: 50px;
            width: 500px;
            margin: 100px;
            background-color: #5f5750;
        }


    style>
head>
<body>
    <div class="c1">菜单div>
body>
html>

注意:以上不是所有的CSS样式。

3.BootStrap

是别人帮我们已写好的CSS样式,我们如果想要使用这个BootStrap:

  • 下载BootStrap
  • 使用
    • 在页面上引入BootStrap
    • 编写HTML时,按照BootStrap的规定来编写 + 自定制。

3.1 初识

https://v3.bootcss.com/

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    
    <link rel="stylesheet" href="static/plugins/bootstrap-3.4.1/css/bootstrap.css">

    
    
head>
<body>

    <input type="button" value="提交" />

    <input type="button" value="提交" class="btn btn-primary" />
    <input type="button" value="提交" class="btn btn-success" />
    <input type="button" value="提交" class="btn btn-danger" />
    <input type="button" value="提交" class="btn btn-danger btn-xs" />

body>
html>

3.2 导航

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <link rel="stylesheet" href="static/plugins/bootstrap-3.4.1/css/bootstrap.css">
    <style>
        .navbar {
            border-radius: 0;
        }
    style>
head>
<body>

<div class="navbar navbar-default">
    <div class="container-fluid">
        
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse"
                    data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <span class="sr-only">Toggle navigationspan>
                <span class="icon-bar">span>
                <span class="icon-bar">span>
                <span class="icon-bar">span>
            button>
            <a class="navbar-brand" href="#">中国联通a>
        div>

        
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav">
                <li class="active"><a href="#">Link <span class="sr-only">(current)span>a>li>
                <li><a href="#">广西a>li>
                <li><a href="#">上海a>li>
                <li><a href="#">神州a>li>
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true"
                       aria-expanded="false">Dropdown <span class="caret">span>a>
                    <ul class="dropdown-menu">
                        <li><a href="#">四川a>li>
                        <li><a href="#">上海a>li>
                        <li><a href="#">Something else herea>li>
                        <li role="separator" class="divider">li>
                        <li><a href="#">Separated linka>li>
                        <li role="separator" class="divider">li>
                        <li><a href="#">One more separated linka>li>
                    ul>
                li>
            ul>
            <form class="navbar-form navbar-left">
                <div class="form-group">
                    <input type="text" class="form-control" placeholder="Search">
                div>
                <button type="submit" class="btn btn-default">Submitbutton>
            form>
            <ul class="nav navbar-nav navbar-right">
                <li><a href="#">登录a>li>
                <li><a href="#">注册a>li>
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true"
                       aria-expanded="false">Dropdown <span class="caret">span>a>
                    <ul class="dropdown-menu">
                        <li><a href="#">Actiona>li>
                        <li><a href="#">Another actiona>li>
                        <li><a href="#">Something else herea>li>
                        <li role="separator" class="divider">li>
                        <li><a href="#">Separated linka>li>
                    ul>
                li>
            ul>
        div>
    div>
div>


body>
html>

3.3 栅格系统

https://v3.bootcss.com/css/#grid

  • 把整体划分为了12格

  • 分类

    • 响应式,根据屏幕宽度不同

      .col-lg-   1170px
      .col-md-   970px
      .col-sm-   750px
      
    • 非响应式

      1
      2
    • 列偏移

    DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Titletitle>
        <link rel="stylesheet" href="static/plugins/bootstrap-3.4.1/css/bootstrap.css">
    head>
    <body>
        <div>
            <div class="col-sm-offset-2 col-sm-6" style="background-color: green">2div>
        div>
    body>
    html>
    

3.4 container

<div class="container-fluid">
    <div class="col-sm-9">左边div>
    <div class="col-sm-3">右边div>
div>
<div class="container">
    <div class="col-sm-9">左边div>
    <div class="col-sm-3">右边div>
div>

3.5 面板

<div class="panel panel-default">
  <div class="panel-heading">Panel heading without titlediv>
  <div class="panel-body">
    Panel content
  div>
div>
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <link rel="stylesheet" href="static/plugins/bootstrap-3.4.1/css/bootstrap.css">
    <style>
        .account {
            width: 400px;
            border: 1px solid #dddddd;
            border-radius: 5px;
            box-shadow: 5px 5px 20px #aaa;

            margin-left: auto;
            margin-right: auto;
            margin-top: 100px;
            padding: 20px 40px;
        }

        .account h2 {
            margin-top: 10px;
            text-align: center;
        }
    style>
head>
<body>
<div class="account">
    <h2>用户登录h2>
    <form>
        <div class="form-group">
            <label for="exampleInputEmail1">用户名label>
            <input type="email" class="form-control" id="exampleInputEmail1" placeholder="用户名">
        div>
        <div class="form-group">
            <label for="exampleInputPassword1">密码label>
            <input type="password" class="form-control" id="exampleInputPassword1" placeholder="密码">
        div>

        <input type="submit" value="登 录" class="btn btn-primary">
    form>
div>
body>
html>

案例:后台管理

  • 导航
  • 新建,按钮。
  • 表格,
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <link rel="stylesheet" href="static/plugins/bootstrap-3.4.1/css/bootstrap.css">
    <style>
        .navbar {
            border-radius: 0;
        }
    style>
head>
<body>
<div class="navbar navbar-default">
    <div class="container">

        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse"
                    data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <span class="sr-only">Toggle navigationspan>
                <span class="icon-bar">span>
                <span class="icon-bar">span>
                <span class="icon-bar">span>
            button>

            <a class="navbar-brand" href="#">中国联通xx系统a>
        div>

        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav">
                <li><a href="#">广西a>li>
                <li><a href="#">上海a>li>
            ul>
            <ul class="nav navbar-nav navbar-right">
                <li><a href="#">登录a>li>
                <li><a href="#">注册a>li>
            ul>
        div>

    div>
div>

<div class="container">
    <div>
        <input type="button" value="新 建" class="btn btn-primary"/>
    div>

    <div style="margin-top: 20px">
        <table class="table table-bordered table-hover">
            <thead>
            <tr>
                <th>#th>
                <th>First Nameth>
                <th>Last Nameth>
                <th>Usernameth>
            tr>
            thead>
            <tbody>
            <tr>
                <th scope="row">1th>
                <td>Marktd>
                <td>Ottotd>
                <td>@mdotd>
            tr>
            <tr>
                <th scope="row">2th>
                <td>Jacobtd>
                <td>Thorntontd>
                <td>@fattd>
            tr>
            <tr>
                <th scope="row">3th>
                <td>Larrytd>
                <td>the Birdtd>
                <td>@twittertd>
            tr>
            tbody>
        table>
    div>

div>


body>
html>

案例:后台管理+面板

DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Titletitle>
    <link rel="stylesheet" href="static/plugins/bootstrap-3.4.1/css/bootstrap.css">
    <style>
        .navbar {
            border-radius: 0;
        }
    style>
head>
<body>
<div class="navbar navbar-default">
    <div class="container">

        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse"
                    data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <span class="sr-only">Toggle navigationspan>
                <span class="icon-bar">span>
                <span class="icon-bar">span>
                <span class="icon-bar">span>
            button>

            <a class="navbar-brand" href="#">中国联通xx系统a>
        div>

        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav">
                <li><a href="#">广西a>li>
                <li><a href="#">上海a>li>
            ul>
            <ul class="nav navbar-nav navbar-right">
                <li><a href="#">登录a>li>
                <li><a href="#">注册a>li>
            ul>
        div>

    div>
div>

<div class="container">
    <div class="panel panel-default">
        <div class="panel-heading">表单区域div>
        <div class="panel-body">
            <form class="form-inline">
                <div class="form-group">
                    <label class="sr-only" for="exampleInputEmail3">Email addresslabel>
                    <input type="email" class="form-control" id="exampleInputEmail3" placeholder="Email">
                div>
                <div class="form-group">
                    <label class="sr-only" for="exampleInputPassword3">Passwordlabel>
                    <input type="password" class="form-control" id="exampleInputPassword3" placeholder="Password">
                div>
                <button type="submit" class="btn btn-success">保 存button>
            form>
        div>
    div>

    <div class="panel panel-default">
        <div class="panel-heading">数据列表div>
        

        <table class="table table-bordered table-hover">
            <thead>
            <tr>
                <th>#th>
                <th>First Nameth>
                <th>Last Nameth>
                <th>操作th>
            tr>
            thead>
            <tbody>
            <tr>
                <th scope="row">1th>
                <td>Marktd>
                <td>Ottotd>
                <td>
                    <a class="btn btn-primary btn-xs">编辑a>
                    <a class="btn btn-danger btn-xs">删除a>
                td>
            tr>
            <tr>
                <th scope="row">2th>
                <td>Jacobtd>
                <td>Thorntontd>
                <td>
                    <a class="btn btn-primary btn-xs">编辑a>
                    <a class="btn btn-danger btn-xs">删除a>
                td>
            tr>
            <tr>
                <th scope="row">3th>
                <td>Larrytd>
                <td>the Birdtd>
                <td>
                    <a class="btn btn-primary btn-xs">编辑a>
                    <a class="btn btn-danger btn-xs">删除a>
                td>
            tr>
            tbody>
        table>

    div>
    <ul class="pagination">
        <li class="disabled"><a href="#" aria-label="Previous"><span aria-hidden="true">«span>a>li>
        <li class="active"><a href="#">1 <span class="sr-only">(current)span>a>li>
        <li><a href="#">2a>li>
        <li><a href="#">3a>li>
        <li><a href="#">4a>li>
        <li><a href="#">5a>li>
        <li><a href="#" aria-label="Next"><span aria-hidden="true">»span>a>li>
    ul>

div>


body>
html>

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