1.基本下拉菜单
当鼠标移动到指定元素上时，会出现下拉菜单。
html:
<div class="dropdown">
<span>鼠标移动到我这！</span>
<div class="dropdown-content">
<p>下拉菜单</p>
<p>welcome</p>
</div>
</div>
css:
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: red;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
padding: 12px 16px;
}
.dropdown:hover .dropdown-content {
display: block;
}
效果图：
2.创建下拉菜单，并允许用户选取列表中的某一项。
html:
<div class="dropdown">
<button class="dropbtn">下拉菜单</button>
<div class="dropdown-content">
<a href="https://i.cnblogs.com">加油</a>
<a href="https://i.cnblogs.com">开心就好</a>
<a href="https://i.cnblogs.com">博客园</a>
</div>
</div>
css:
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
display: block;
}
.dropdown:hover .dropbtn {
background-color: #3e8e41;
}
效果图：
3.right: 0;
html:
<div class="dropdown" style="float:left;">
<button class="dropbtn">左</button>
<div class="dropdown-content" style="left:0;">
<a href="#">water</a>
<a href="#">jone</a>
<a href="#">sun</a>
</div>
</div>
<div class="dropdown" style="float:right;">
<button class="dropbtn">右</button>
<div class="dropdown-content">
<a href="#">happy</a>
<a href="#">html</a>
<a href="#">book</a>
</div>
</div>
css:
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
right: 0;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
display: block;
}
.dropdown:hover .dropbtn {
background-color: #3e8e41;
}
效果图：
4.导航栏上的下拉菜单
html:
<ul>
<li><a class="active" href="#home">主页</a></li>
<li><a href="#news">新闻</a></li>
<div class="dropdown">
<a href="#" class="dropbtn">下拉菜单</a>
<div class="dropdown-content">
<a href="#">链接 1</a>
<a href="#">链接 2</a>
<a href="#">链接 3</a>
</div>
</div>
</ul>
css:
ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}
li {
float: left;
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover, .dropdown:hover .dropbtn {
background-color: #111;
}
.dropdown {
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {background-color: blue}
.dropdown:hover .dropdown-content {
display: block;
}
效果图：
5.下拉图片
html:
<div class="dropdown">
<img src="http://fq.wc.lt//up/1520348846.png" width="100" height="50">
<div class="dropdown-content">
<img src="http://fq.wc.lt//up/1520348846.png" alt="Trolltunga Norway" width="400" height="200">
<div class="desc">welcome</div>
</div>
</div>
css:
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown:hover .dropdown-content {
display: block;
}
.desc {
padding: 15px;
text-align: center;
}
效果图：
