我怎样才能完成这个仅限移动设备的汉堡菜单？

Question

我的网站上有一个汉堡菜单，它只显示在 600 像素或以下。我希望我的类别位于此图标下。这将需要使这些菜单项在 600px 阈值处从绿色导航栏消失，然后重新出现在该汉堡包下。实现这一目标的最佳方法是什么？

Here is the live view of the site 这是我的代码：

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<style>
.body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.topnav {
  overflow: hidden;
  background-color: #47a23f;
}

.topnav a {
  float: left;
  font-size: 16px;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.dropdown .dropbtn {
  font-size: 16px;  
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}

.dropdown {
  float: left;
  overflow: hidden;
}

.dropdown .dropbtn {
  font-size: 16px;  
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}
.topnav a:hover, .dropdown:hover .dropbtn {
  background-color: #005da6;
}

.topnav a.active {
  background-color: #005da6;
  color: white;
}

.topnav .icon {
  display: none;
}
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #47a23f;
  min-width: 13%;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  float: none;
  color:#fff;
  padding: 5% 10%;
  text-decoration: none;
  display: block;
  text-align: left;
}

.dropdown-content a:hover {
  background-color: #003150;
  color:#fff;
}

.dropdown:hover .dropdown-content {
  display: block;
  color:#fff;
}

  .topnav > .active {
  background-color: #005da6;
}

.topnav:hover > .active {
  background-color: inherit;
}

.topnav > .active:hover {
  background-color: #005da6;
}

.dropdown-content > .active {
  background-color: #003150;
}

.dropdown-content:hover > .active {
  background-color: inherit;
}

.dropdown-content > .active:hover {
  background-color: #003150;
}
  
 @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>



<div class="topnav" id="myTopnav">
  <a href="https://cloud.e.activehealth.com/BYBO/Home" class="active">Home</a>
 <div class="dropdown">
    <button class="dropbtn">Workforce 
      <i class="fa fa-caret-down"></i>
    </button>
    <div class="dropdown-content">
      <a target="blank" href="https://myactivehealth.com/Portal/PreRegistrations/Index">Request to enroll</a>
      <a target="blank" href="https://www.myactivehealth.com/Portal/Registration/RegistrationStep1?IsoAuthDPRequest=False">Create an account</a>
      <a target="blank" href="https://www.myactivehealth.com/Portal/PortalLogin.aspx?SupplierURL=15571">Log in</a>
     </div>
  </div>
  <div class="dropdown">
    <a href="https://cloud.e.activehealth.com/BYBO/Employer">Employer</a></div>
  <div class="dropdown">
    <button class="dropbtn">Injured Workers 
      <i class="fa fa-caret-down"></i>
    </button>
    <div class="dropdown-content">
 <a target="blank" href="https://www.myactivehealth.com/Portal/Registration/RegistrationStep1?IsoAuthDPRequest=False">Create an account</a>
      <a target="blank" href="https://www.myactivehealth.com/Portal/PortalLogin.aspx?SupplierURL=15571">Log in</a>
    </div>
  </div> 
  <a href="javascript:void(0);" class="icon" onclick="myFunction()">
    <i class="fa fa-bars"></i>
  </a>
</div>

<script>
function myFunction() {
  var x = document.getElementById("myTopnav");
  if (x.className === "topnav") {
    x.className += " responsive";
  } else {
    x.className = "topnav";
  }
}
</script>

Answer 1

通过纯 CSS 更改，利用 flex，我能够得到这个结果：

CSS：

@media screen and (max-width: 600px) {
    #myTopnav {
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        flex: 0 0 100%;
        justify-content: flex-start;
    }
    #myTopnav > a:nth-child(1) {
        background-color: #47a23f;
        order: 1;
    }
    #myTopnav > div.dropdown {
        width: 100%;
        max-width: 100%;
    }
    #myTopnav > div.dropdown:nth-child(2) {
        order: 3;
    }
    #myTopnav > div.dropdown:nth-child(3) {
        order: 2;
    }
    #myTopnav > div.dropdown:nth-child(4) {
        order: 4;
    }
    #myTopnav > a:last-child {
        display: block;
        position: absolute;
        float: none;
        right: 0;
    }
}

您可以对其进行微调。 IE。为显示逻辑添加一个类或其他东西以最初不显示元素，然后在切换汉堡菜单时为它们提供适当的显示属性。这是 CSS 和 JS 所需的最后一点。