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<div class="topnav" id="myTopnav">
<a href="#home">主页</a>
<a href="#news">新闻</a>
<a href="#contact">联系方式</a>
<a href="#about">关于我们</a>
<a href="javascript:void(0);" style="font-size:15px;" class="icon" onclick="myFunction()">☰</a>
</div>
<div style="padding-left:16px">
<h2>响应式顶部导航实例</h2>
<p>重置浏览器查看实例。</p>
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function myFunction() {
var x = document.getElementById("myTopnav");
if (x.className === "topnav") {
x.className += " responsive";
} else {
x.className = "topnav";
}
body {margin:0;}
.topnav {
overflow: hidden;
background-color: #333;
.topnav a {
float: left;
display: block;
color: #f2f2f2;
text-align: center;
padding: 14px 16px;
text-decoration: none;
font-size: 17px;
.topnav a:hover {
background-color: #ddd;
color: black;
.topnav .icon {
display: none;
@media screen and (max-width: 600px) {
.topnav a:not(:first-child) {display: none;}
.topnav a.icon {
float: right;
.topnav.responsive {position: relative;}
.topnav.responsive .icon {
position: absolute;
right: 0;
top: 0;
.topnav.responsive a {
float: none;
text-align: left;