学习网址：https://v3.bootcss.com/css/
1. 简单介绍
BootStrap：web前端框架（控制样式）
响应式布局，同一套页面可兼容不同分辨率的设备
下载导入：https://blog.csdn.net/poppy_rain/article/details/97654456
2. 响应式布局
实现：依赖于栅格系统
将一行氛围12格，指定元素在不同分辨率设备占几个格
步骤：（class=''）
定义容器：container（有留白）、container-fluid（100%宽度）
定义行：row
定义元素：col-设备代号-格子数 -----指定在不同设备上所占格子数
设备代号：
xs手机、sm平板、md桌面、lg超大桌面
<div class="container-fluid"> <div class="row"> <div class="col-md-1 col-sm-2">栅格</div> </div> </div>注意：
一行中格子数超过12，超出部分自动转行
向下兼容，向上 一个格子占一行
3. 全局样式
按钮：class='btn btn-default'
<button type="button" class="btn btn-default">（默认样式）Default</button> <button type="button" class="btn btn-primary">（首选项）Primary</button> <button type="button" class="btn btn-success">（成功）Success</button> <button type="button" class="btn btn-info">（一般信息）Info</button> <button type="button" class="btn btn-warning">（警告）Warning</button> <button type="button" class="btn btn-danger">（危险）Danger</button> <button type="button" class="btn btn-link">（链接）Link</button>图片：class='img-responsive img-cricle'
<img src="..." alt="..." class="img-rounded"> <!--圆角--> <img src="..." alt="..." class="img-circle"> <!--圆形--> <img src="..." alt="..." class="img-thumbnail"> <!--相框-->表格：class='table table-bordered table-hover'
table-striped 斑马条纹 table-bordered 单元格加边框 table-hover 鼠标悬停相应 table-condensed 紧凑表单：class='form-horizontal' 、form-inline、form-group、form-control
<form class="form-horizontal"> <!--水平排列--> <div class="form-group"> <label for="inputEmail3" class="col-sm-2 control-label">Email</label> <div class="col-sm-10"> <input type="email" class="form-control" id="inputEmail3" placeholder="Email"> </div> </div> <div class="form-group"> <div class="col-sm-offset-2 col-sm-10"> <button type="submit" class="btn btn-default">Sign in</button> </div> </div> </form> <form class="form-inline"> <!--内联表单（显示在一行）--> <div class="form-group"> <label for="exampleInputName2">Name</label> <input type="text" class="form-control" id="exampleInputName2" placeholder="Jane Doe"> </div> <div class="form-group"> <label for="exampleInputEmail2">Email</label> <input type="email" class="form-control" id="exampleInputEmail2" placeholder="jane.doe@example.com"> </div> <button type="submit" class="btn btn-default">Send invitation</button> </form>
4. 组件
导航条：
<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="#">Brand</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> <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">Submit</button> </form> <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>分页条：
<nav aria-label="Page navigation"> <ul class="pagination"> <li> <a href="#" aria-label="Previous"> <span aria-hidden="true">«</span> </a> </li> <li><a href="#">1</a></li> <li><a href="#">2</a></li> <li><a href="#">3</a></li> <li><a href="#">4</a></li> <li><a href="#">5</a></li> <li> <a href="#" aria-label="Next"> <span aria-hidden="true">»</span> </a> </li> </ul> </nav>5. 插件
轮播图carousel：
<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="..." alt="..."> <div class="carousel-caption"> ... </div> </div> <div class="item"> <img src="..." 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>
