示例 2 : 下拉菜单的按钮 示例 3 : 左浮动 示例 4 : 右浮动 示例 5 : 显示 示例 6 : 隐藏 示例 7 : 隐藏 
					关闭按钮,一般用于切换效果
					 
					
				<!DOCTYPE html>
<script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script>
<link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet">
<script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script>
  
   <button type="button" class="close" aria-hidden="true">
      ×
   </button>
 
									
								<!DOCTYPE html>
<script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script>
<link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet">
<script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script>
  
   <button type="button" class="close" aria-hidden="true">
      ×
   </button>
								
								
					下拉菜单的按钮
					 
					
				<!DOCTYPE html>
<script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script>
<link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet">
<script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script>
  
<span class="caret"></span>
 
									
								<!DOCTYPE html> <script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script> <link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet"> <script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script> <span class="caret"></span> 
					左浮动 ,相当于css中的float:left
					 
					
				<!DOCTYPE html>
<script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script>
<link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet">
<script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script>
  
<div class="pull-left">文字浮动到左边</div>
 
									
								<!DOCTYPE html> <script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script> <link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet"> <script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script> <div class="pull-left">文字浮动到左边</div> 
					右浮动 ,相当于css中的float:right
					 
					
				<!DOCTYPE html>
<script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script>
<link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet">
<script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script>
  
<div class="pull-right">文字浮动到右边</div>
 
									
								<!DOCTYPE html> <script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script> <link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet"> <script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script> <div class="pull-right">文字浮动到右边</div> 
					强行显示
					 
					
				<!DOCTYPE html>
<script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script>
<link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet">
<script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script>
  
<div class="show">显示</div>
 
									
								<!DOCTYPE html> <script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script> <link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet"> <script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script> <div class="show">显示</div> 
					强行隐藏,会把该元素的位置也让出来
					 
					
				<!DOCTYPE html>
<script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script>
<link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet">
<script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script>
  
<div class="show">显示1</div>
<div class="hidden">隐藏</div>
<div class="show">显示3</div>
 
									
								<!DOCTYPE html> <script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script> <link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet"> <script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script> <div class="show">显示1</div> <div class="hidden">隐藏</div> <div class="show">显示3</div> 
					强行隐藏,该元素的位置会保留
					 
					
				<!DOCTYPE html>
<script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script>
<link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet">
<script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script>
  
<div class="show">显示1</div>
<div class="invisible">隐藏</div>
<div class="show">显示3</div>
 
									
								<!DOCTYPE html> <script src="https://how2j.cn/study../../../js/jquery/2.0.0/jquery.min.js"></script> <link href="https://how2j.cn/study../../../css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet"> <script src="https://how2j.cn/study../../../js/bootstrap/3.3.6/bootstrap.min.js"></script> <div class="show">显示1</div> <div class="invisible">隐藏</div> <div class="show">显示3</div> 
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