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响应式菜单-自动折叠

阅读：5527 输入：2018-09-09 09:41:57

<html><head></head><body><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="#contact">你是一只狗吗</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>
</div><style>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;
    display: block;
  }
}
@media screen and (max-width: 600px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
}</style><script>function myFunction() {
    var x = document.getElementById("myTopnav");
    if (x.className === "topnav") {
        x.className += " responsive";
    } else {
        x.className = "topnav";
    }
}</script></body></html>

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