一、今天要讲的是Bootstrap前端开发框架的几个组件
1、组件:轮播-Carousel
轮播组件就是将几张同等大小的大图，按照顺序依次播放。
2、组件:列表组-List group
列表组是灵活又强大的组件，不仅能用于显示一组简单的元素，还能用于复杂的定制的内容。列表组可以用来制作列表清单、垂直导航等效果，也可以配合其他的组件制作出更漂亮的组件。
3、页面内容；画像-Figure
就是给图片添加.img-fluid样式，或定义max-width:100%、height:auto样式，即可赋予响应式特性，图片大小会随着父元素大小同步缩放。.img-thumbnail添加边框样式。
4、组件：表单-Forms
bootstrap中表单布局分为两种：堆叠表单(垂直方向)、内联表单(水平方向)
使用堆叠表单：案列：实现登录&注册界面
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>案例5：实现登录&注册页面</title>
<!-- 支持手机端 -->
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<!-- 移入Bootstrap的CSS -->
<link rel="stylesheet" type="text/css" href="css/bootstrap.css" />
<style type="text/css">
form {
width: 300px;
/* 宽度 */
text-align: center;
/* 内容水平居中 */
/* 让左右自适应 */
margin-left: auto;
margin-right: auto;
margin-top: 100px;
}
form button {
width: 300px;/* 宽度 */
margin-bottom: 20px;/* 下间距 */
}
form h2{
margin-bottom: 20px;/* 下间距 */
}
</style>
</head>
<body>
<form>
<h2>用户注册</h2>
<div class="form-group">
<input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
</div>
<div class="form-group">
<input type="password" class="form-control" id="exampleInputPassword1">
</div>
<div class="form-group form-check">
<input type="checkbox" class="form-check-input" id="exampleCheck1">
<label class="form-check-label" for="exampleCheck1">Remake me</label>
</div>
<button type="submit" class="btn btn-primary">注册</button>
<div class="form-group ">
<label class="form-check-label" for="exampleCheck1">©2017-2022</label>
</div>
</form>
<!-- 分别引入jQuery和Bootstrap -->
<script type="text/javascript" src="js/jquery-3.3.1.js"></script>
<script type="text/javascript" src="js/bootstrap.js"></script>
</body>
</html>
效果如下:
5、栅格系统-Grid system
概念：Bootstrap提供了一套响应式、移动设备优先的流式网格系统
特点：会随着屏幕或视口(viewport)尺寸的增加，系统会自动分为最多12列
代码如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>案例4：首页整合</title>
<!-- 引入Bootstrap的样式-->
<link rel="stylesheet" type="text/css" href="css/bootstrap.css" />
<style>
.navbar-collapse{
flex-grow: 0;/* 固定容器中 1代表弹性过大占用父容器剩余空间 0代表不占用 */
}
.form-group{
width: 300px;/* 宽度 */
margin-left: auto;/* 左间距自适应 自动 */
margin-right: auto;/* 右间距自适应 自动 */
margin-top: 31px;/* 100-38=62/2=31px 居中*/
}
.ss{
height: 100px;/* 高度 */
margin-top: 30px;/* 上间距 */
background-color: #DCDCDC;/* 背景颜色 */
}
/* 画像*/
.figure{
text-align: center;/* 文字居中 */
margin-top: 20px;/* 上间距 */
}
.list-group,#carouselExampleIndicators{
margin-top: 30px;/* 上间距 */
}
/*指示灯样式 */
.carousel-indicators li{
background-color: blue;
}
.xxx{
margin-top: 30px;/* 上间距 */
background-image: url(img/title_bj.png);/* 背景图片 */
background-repeat: no-repeat;/* 不平铺 */
color: white;/* 字体颜色 */
font-size: 18px;/* 字体大小 */
padding-left: 20px;/* 左内间距 */
}
</style>
</head>
<body>
<!-- 导航区域条组件 -->
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<div class="container">
<a class="navbar-brand" href="#">您好，欢迎来到欧阳老狗的逆袭书店</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav"
aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">首页 <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">登录</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">注册</a>
</li>
<li class="nav-item">
<a class="nav-link " href="#">我的购物车</a>
</li>
</ul>
</div>
</div>
</nav>
<!-- 栅格搭建主页框架 -->
<div class="container">
<!-- 第一行： 1列:搜索区域 -->
<div class="row ss">
<div class="col">
<!--搜索区域 -->
<form>
<div class="form-group">
<!-- 输入框组合-->
<div class="input-group mb-3">
<input type="text" class="form-control" placeholder="书籍关键字" aria-label="Recipient's username" aria-describedby="button-addon2">
<div class="input-group-append">
<button class="btn btn-primary" type="button" id="button-addon2">查询</button>
</div>
</div>
</div>
</form>
</div>
</div>
<!-- 第二行-->
<div class="row">
<div class="col-3" >
<!-- 左三为书籍分类 -->
<div class="list-group">
<button type="button" class="list-group-item list-group-item-action active" aria-current="true">
书籍分类
</button>
<button type="button" class="list-group-item list-group-item-action">言情</button>
<button type="button" class="list-group-item list-group-item-action">玄幻</button>
<button type="button" class="list-group-item list-group-item-action">都市</button>
<button type="button" class="list-group-item list-group-item-action" >武侠</button>
<button type="button" class="list-group-item list-group-item-action">修仙</button>
<button type="button" class="list-group-item list-group-item-action">末世</button>
<button type="button" class="list-group-item list-group-item-action">校园</button>
<button type="button" class="list-group-item list-group-item-action" >热血</button>
</div>
</div>
<div class="col-9">
<!-- 右9为 轮播图&新书上架&热门书籍 -->
<!-- 右9中第一行 -->
<div class="row" >
<div class="col">
<!-- 轮播图 -->
<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
<!-- 指示灯部分 -->
<ol class="carousel-indicators">
<li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
<li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
<li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
<li data-target="#carouselExampleIndicators" data-slide-to="3"></li>
</ol>
<div class="carousel-inner">
<div class="carousel-item active">
<img src="img/lb1.png" class="d-block w-100" alt="...">
</div>
<div class="carousel-item">
<img src="img/lb2.jpg" class="d-block w-100" alt="...">
</div>
<div class="carousel-item">
<img src="img/lb3.jpg" class="d-block w-100" alt="...">
</div>
<div class="carousel-item">
<img src="img/lb4.jpeg" class="d-block w-100" alt="...">
</div>
</div>
<!-- 左右箭头区域 -->
<button class="carousel-control-prev" type="button" data-target="#carouselExampleIndicators" data-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</button>
<button class="carousel-control-next" type="button" data-target="#carouselExampleIndicators" data-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</button>
</div>
</div>
</div>
<div class="xxx">
新书上架
</div>
<!-- 右9中第二行 新书上架 5列-->
<div class="row" >
<div class="col">
<figure class="figure">
<img src="img/1.png" class="figure-img img-fluid rounded" alt="...">
<figcaption class="figure-caption"><b>冷间谍</b></figcaption>
</figure>
</div>
<div class="col">
<figure class="figure">
<img src="img/2.png" class="figure-img img-fluid rounded" alt="...">
<figcaption class="figure-caption"><b>第一商会</b></figcaption>
</figure>
</div>
<div class="col">
<figure class="figure">
<img src="img/3.png" class="figure-img img-fluid rounded" alt="...">
<figcaption class="figure-caption"><b>狂人日记</b></figcaption>
</figure>
</div>
<div class="col">
<figure class="figure">
<img src="img/4.png" class="figure-img img-fluid rounded" alt="...">
<figcaption class="figure-caption"><b>散文小说</b></figcaption>
</figure>
</div>
<div class="col">
<figure class="figure">
<img src="img/5.png" class="figure-img img-fluid rounded" alt="...">
<figcaption class="figure-caption"><b>自动化运维</b></figcaption>
</figure>
</div>
</div>
<div class="xxx">
热门书籍
</div>
<!-- 右9中第三行 热门书籍 5列-->
<div class="row" >
<div class="col">
<figure class="figure">
<img src="img/6.png" class="figure-img img-fluid rounded" alt="...">
<figcaption class="figure-caption"><b>JAVA</b></figcaption>
</figure>
</div>
<div class="col">
<figure class="figure">
<img src="img/7.png" class="figure-img img-fluid rounded" alt="...">
<figcaption class="figure-caption"><b>CAD2012</b></figcaption>
</figure>
</div>
<div class="col">
<figure class="figure">
<img src="img/8.png" class="figure-img img-fluid rounded" alt="...">
<figcaption class="figure-caption"><b>时光走了你还在</b></figcaption>
</figure>
</div>
<div class="col">
<figure class="figure">
<img src="img/9.png" class="figure-img img-fluid rounded" alt="...">
<figcaption class="figure-caption"><b>散文小说</b></figcaption>
</figure>
</div>
<div class="col">
<figure class="figure">
<img src="img/5.png" class="figure-img img-fluid rounded" alt="...">
<figcaption class="figure-caption"><b>自动化运维</b></figcaption>
</figure>
</div>
</div>
</div>
</div>
</div>
<!-- 分别引入jQuery和Bootstrap的类框 -->
<script type="text/javascript" src="js/jquery-3.3.1.js"></script>
<script type="text/javascript" src="js/bootstrap.js"></script>
</body>
</html>
效果如下 ;
