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javascript - 响应式移动汉堡菜单

问题描述

我几乎完成了我的网站，只是我的下拉菜单不起作用。我试过谷歌搜索并向朋友寻求建议，但没有任何帮助。下面我附上了使用或提到下拉菜单的代码：

/*Responsive Navigation*/
$(document).ready(function() {
  $('.toggle').click(function() {
    $('.toggle').toggleClass('active')
    $('nav ul').toggleClass('active-menu')
  })
});
@media(max-width:900px) {
  .toggle {
    display: block;
  }
  .toggle:before {
    content: '\f0c9';
    font-family: fontAwesome;
    line-height: 0px;
    margin-left: -30px;
  }
  .toggle.active:before {
    content: '\f00d' !important;
  }
}


/*Navbar full Screen*/

.toggle {
  display: none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<a href="" class="dropdown">
  <div class="toggle"></div>
</a>
<!--Menu items-->
<ul class="menu">
  <li class="active"><a href="#main">Home</a></li>
  <li><a href="#about">About</a></li>
  <li><a href="#services">Services</a></li>
  <li><a href="#portfolio">Portfolio</a></li>
  <li><a href="#contact-form">Contact</a></li>
</ul>

标签： javascripthtmljquerycss

解决方案

为此，您将需要一些巨大的代码。看一下这个！正是你需要的。 

function myFunction() {
 var x = document.getElementById("myTopnav");
 if (x.className === "topnav") {
  x.className += " responsive";
  } else {
   x.className = "topnav";
  }
 }
 
body {
 margin-right: 2;
 margin-left: 2;
}

.topnav {
 overflow: hidden;
 background-color: black;
 padding-left: -2;
 padding-right: -2;
}

.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: #eee;
 color: black;
}

.topnav a.active {
 background-color: #4CAF50;
 color: white;
}

.topnav .icon {
 display: none;
}

@media screen and (max-width: 600px) 
{
  .topnav a:not(:first-child) {
    display: none;
   }
  .topnav a.icon {
   float: right;
   display: block;
  }
 }

  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
   position: absolute;
   right: 0;
   top: 0;
  }
  .topnav.responsive a {
   float: none;
   display: block;
   text-align: left;
  }
 }
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" 
content="width=device-width, initial- 
scale=1">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
</head>
<body>
<div class="topnav" id="myTopnav">
  <a href="#home" class="active">Home</a>
  <a href="#news">News</a>
  <a href="#contact">Contact</a>
  <a href="#about">About</a>
  <a href="javascript:void(0);" class="icon" onclick="myFunction()">
   <i class="fa fa-bars"></i>
  </a>
</div>
 <p>Resize the browser window to see how it works. If your screen is more than 600px wide, the menu will be in one line. If not, it will be a hamburger menu.</p>
</body>
</html>

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