一、简介
响应式下拉菜单可在多个移动端显示会有不同的效果。
二、代码如下
<!doctype html>
<html>
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width"/>
<title>响应式下拉菜单</title>
<link rel="stylesheet" type="text/css" href="demo020.css" media="screen and (min-width:1024px)"/>
<link rel="stylesheet" type="text/css" href="demo021.css" media="screen and (max-width:1024px)"/>
<link href="https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.css" rel="stylesheet">
</head>
<body>
<div class="nav">
<div class="toggle">
<img class="tu" src="shitu2.png"/>
<i id="btn" class="fa fa-bars"></i>
</div>
<div class="bb"></div>
<ul id="menu" class="clearfix">
<li><a href="#">First</a></li>
<li><a href="#">Second</a></li>
<li><a href="#">Third</a></li>
<li><a href="#">Fourth</a></li>
<li><a href="#">Fifth</a></li>
</ul>
</div>
<script type="text/javascript">
var btn=document.getElementById("btn");
var menu=document.getElementById("menu");
btn.onclick=function(){
//alert(1);
if(menu.style.display=="none"){
menu.style.display="block";
}else{
menu.style.display="none";
}
}
window.onresize=function(){
var vw=document.documentElement.clienWidth;
if(vw>640){
menu.style.display="block";
}
}
</script>
</body>
</html>
body{
margin:0;}
.nav{
width:100%;
background-color:#00316b;
position:relative;}
ul{
padding:0px;
margin:0px;
width:80%;
margin:0 auto;
background:#00316b;}
ul>li{
list-style:none;
float:left;}
ul>li>a{
color:#fff;
text-decoration:none;
display:block;
padding:20px 30px;}
ul>li:hover{
background-color:red;}
.clearfix:after{
display:block;
content:"";
height:0px;
visibility:hidden;
clear:both;}
.clearfix{
zoom:1;
}
.toggle{
text-align:right;
color:#fff;
padding:20px;
font-size:20px;
background:black;
/* background-color:#001r44; */
display:none;
overflow:hidden;}
.tu{
float:left;}
.bb{
position:absolute;
background-image:url(shitu2.png);
background-repeat:no-repeat;
background-size:100px;
width:100px;
height:40px;
left:20px;
top:10px;
}
----------
body{
margin:0;
}
.nav{
width:100%;
background-color:#00316b;
}
ul{
padding:0px;
margin:0px;
width:100%;
margin:0 auto;
background:#00316b;
}
ul>li{
text-align:center;
list-style:none;
/* float:left; */
}
ul>li>a{
color:#fff;
text-decoration:none;
display:block;
padding:20px 30px;
}
ul>li:hover{
background-color:red;
}
.clearfix:after{
display:block;
content:"";
height:0px;
visibility:hidden;
clear:both;
}
.clearfix{
zoom:1;
}
.toggle{
text-align:right;
color:#fff;
padding:20px;
background:yellow;
font-size:20px;
overflow:hidden;
display:block;
}
.tu{
float:left;
width:100px;
}
第三、效果图如下
这是视口大于1024px的时候所显示的内容<PC端>
min-width:1024px
这是视口小于1024px的时候所显示的内容<手机>
max-width:1024px
这是在手机上和iPad上的效果图
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