bootstrap学习，简单商城案列
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一个前端开发的框架
框架：一个半成品软件，开发人员可以在框架基础上，再进行开发，简化编码
好处：
定义了许多css样式
响应式布局
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同一个页面支持多种分辨率
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栅格系统
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同一套系统可以兼容不同分辨率的显示器
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分为12个格子：将一行分为12个格子，可以指定元素占几个格子
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步骤：
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定义容器。相当于之前的table
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容器的分类
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container：两边有留白
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container-fluid:每个设备都是100%宽度
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定义行，相当于之前的tr 样式：row
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定义元素。指定元素在不同的设备上，所占的格子数目
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xs:超小屏幕：col-xs-12
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sm：小屏幕 平板
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md:中等屏幕：桌面显示器
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lg:大屏幕，大显示器
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注意事项
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一行中如果格子数目超过12则会自动换行
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栅格属性可以向上兼容，栅格类适用于屏幕宽度大于等于分界点大小的设备
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如果设备宽度小于了设置的栅格类属性的设备代码的最小值会一个元素占满一整行
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CSS和JS插件
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全局CSS样式：
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按钮： class="btn-default"
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图片：class="img-responsive"：图片在任意尺寸都占100%
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class="img-rounded"：方形还有原型相框型
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表格：
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表单
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组件
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分页条
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插件
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轮播图
简单实列应用
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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
<title>Bootstrap 101 Template</title>
<!-- Bootstrap -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- HTML5 shim 和 Respond.js 是为了让 IE8 支持 HTML5 元素和媒体查询（media queries）功能 -->
<!-- 警告：通过 file:// 协议（就是直接将 html 页面拖拽到浏览器中）访问页面时 Respond.js 不起作用 -->
<!-- jQuery (Bootstrap 的所有 JavaScript 插件都依赖 jQuery，所以必须放在前边) -->
<script src="js/jquery-3.2.1.min.js"></script>
<!-- 加载 Bootstrap 的所有 JavaScript 插件。你也可以根据需要只加载单个插件。 -->
<script src="js/bootstrap.min.js"></script>
<style>
.paddingtop{
padding-top: 15px;
}
.search-input{
float: left;
border: solid 2px yellowgreen;
width: 400px;
height: 32px;
padding-left: 7px;
margin-top: 15px;
}
.search-btn{
float: left;
border: solid 2px yellowgreen;
width: 90px;
height: 32px;
text-align: center;
margin-top: 15px;
}
.jx{
border-right: 2px solid greenyellow;
}
.company{
text-align: center;
height: 50px;
/*竖直居中*/
line-height: 50px;
}
</style>
</head>
<body>
<!--页眉部分-->
<header class="container-fluid">
<div class="row">
<img src="img/top_banner.jpg" class="img-responsive">
</div>
<div class="row paddingtop">
<div class="col-md-3">
<img src="img/logo.jpg " class="img-responsive">
</div>
<div class="col-md-5">
<input class="search-input" placeholder="请！！">
<a href="#" class="search-btn">搜索</a>
</div>
<div class="col-md-4">
<img src="img/hotel_tel.png" class="img-responsive">
</div>
</div>
<!--导航条-->
<div class="row">
<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<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 navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">首页</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<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="#">Link</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="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">One more separated link</a></li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Link</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="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
</div>
<div class="row">
<div id="carousel-example-generic" class="carousel slide" data-ride="carousel">
<!-- Indicators -->
<ol class="carousel-indicators">
<li data-target="#carousel-example-generic" data-slide-to="0" class="active"></li>
<li data-target="#carousel-example-generic" data-slide-to="1"></li>
<li data-target="#carousel-example-generic" data-slide-to="2"></li>
</ol>
<!-- Wrapper for slides -->
<div class="carousel-inner" role="listbox">
<div class="item active">
<img src="img/banner_1.jpg" alt="...">
<div class="carousel-caption">
...
</div>
</div>
<div class="item">
<img src="img/banner_2.jpg" alt="...">
<div class="carousel-caption">
...
</div>
</div>
<div class="item">
<img src="img/banner_3.jpg" alt="...">
<div class="carousel-caption">
...
</div>
</div>
...
</div>
<!-- Controls -->
<a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">
<span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next">
<span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div></div>
</header>
<!--主体部分-->
<div class="container">
<div class="row jx">
<img src="img/icon_5.jpg">
<span >旅游精选</span>
<hr color="red">
</div>
<div class="paddingtop"></div>
<div class="row jx">
<div class="col-md-4">
<div class="thumbnail">
<img src="img/jiangxuan_1.jpg">
<p>精选一</p>
<font color="red">1999</font>
</div>
</div>
<div class="col-md-4"><div class="thumbnail">
<img src="img/jiangxuan_1.jpg">
<p>精选一</p>
<font color="red">1999</font>
</div></div>
<div class="col-md-4"><div class="thumbnail">
<img src="img/jiangxuan_1.jpg">
<p>精选一</p>
<font color="red">1999</font>
</div></div>
</div>
<div class="row jx">
<img src="img/icon_5.jpg">
<span >国内游</span>
<hr color="red">
</div>
<div class="paddingtop"></div>
<div class="row paddingtop">
<div class="col-md-4">
<img src="img/guonei_1.jpg">
</div>
<div class="col-md-8">
<div class="col-md-4">
<div class="thumbnail">
<img src="img/jiangxuan_1.jpg">
<p>精选一</p>
<font color="red">1999</font>
</div>
</div>
<div class="col-md-4">
<div class="thumbnail">
<img src="img/jiangxuan_1.jpg">
<p>精选一</p>
<font color="red">1999</font>
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