布局容器
<div class="container "></div> 左右有固定留白 <div class="container-fluid "></div> 全屏展示
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
<link rel="stylesheet" href="bootstrap-3.3.7-dist/css/bootstrap.min.css">
<script src="bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>
<style>
.c1 {
background-color: red;
height: 50px;
border: 3px solid black;
}
@media screen and(max- 600px){
.c1{
background-color: green;
height: 50px;
border: 3px solid black;
}
}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-6 col-xs-6 c1"></div>
<div class="col-md-6 col-xs-6 c1"></div>
<br>
<div class="col-md-3 c1"></div>
<div class="col-md-9 c1"></div>
<br>
<div class="col-md-1 c1">
<div class="row">
<div class="col-md-6 c1"></div>
<div class="col-md-6 c1"></div>
</div>
</div>
<div class="col-md-1 c1"></div>
<div class="col-md-1 c1"></div>
<div class="col-md-1 c1"></div>
<div class="col-md-1 c1"></div>
<div class="col-md-1 c1"></div>
<div class="col-md-1 c1"></div>
<div class="col-md-1 c1"></div>
<div class="col-md-1 c1"></div>
<div class="col-md-1 c1"></div>
<div class="col-md-1 c1"></div>
<div class="col-md-1 c1"></div>
<div class="col-md-1 c1"></div>
</div>
<div class="row">
<div class="col-md-9 c1"></div>
</div>
</div>
</body>
</html>
栅格系统
一个row表示一行（这一行默认分成了12份，每一份你还可以人为的自定义分成12份）
<div class="container"> //左右两边留有空白 <div class="row"> //一行 <div class="col-md-6 "></div> // 控制你占当前行的多少列 </div> </div>
列偏移
<div class="col-md-offset-3"></div>
浮动
pull-left
pull-right
表格
<table class="table table-hover table-bordered table-striped"></table>
按钮
<button class="btn btn-success">button</button> //绿色 <button class="btn btn-info">button</button> <button class="btn btn-warning">button</button> <button class="btn btn-danger">button</button> <button class="btn btn-primary">button</button>
将a标签设置成按钮模式
<a href="http://www.xiaohuar.com" class="btn btn-primary">Link</a>
btn-block 占父标签100%
要不要试着去访问一下官方呢？https://v3.bootcss.com/