汉堡菜单不显示在响应式导航栏

你好，我是这个网络编程的真正新手，刚刚在几天前了解到，并尝试做出我的响应式导航栏。我找到了w3school的教程，我遵循了它，并修改了一些代码，但它并没有像预期的那样工作。菜单成功在所需的宽度上折叠，但汉堡菜单不显示。我想我已经改变了，并且与我的课程相匹配，但是我不知道还有什么不对。汉堡菜单不显示在响应式导航栏

这里是我到目前为止已经试过：

.navSection { 
 
    width: 100%; 
 
    display: inline-table; 
 
    line-height: 30px; 
 
    background: #1c948a; 
 
    z-index: 3; 
 
    box-shadow: 0px 3px 5px 1px rgba(0, 0, 0, .3); 
 
} 
 

 
.navMenu .icon{ 
 
    display: none; 
 
} 
 

 
@media screen and (max-width: 700px) { 
 
    .navMenu ul li:not(:first-child) {display: none;} 
 
    .navMenu ul li.icon { 
 
    float: right; 
 
    display: block; 
 
    } 
 
} 
 

 
@media screen and (max-width: 700px) { 
 
    .navMenu.responsive {position: relative;} 
 
    .navMenu.responsive .icon { 
 
    position: absolute; 
 
    right: 0; 
 
    top: 0; 
 
    } 
 
    .navMenu.responsive ul li { 
 
    float: none; 
 
    display: block; 
 
    text-align: left; 
 
    } 
 
} 
 

 
.navSectionWrapper { 
 
    width: 90%; 
 
    margin: auto; 
 
} 
 

 
.homelink { 
 
    text-decoration: none; 
 
} 
 

 
.navlogo { 
 
    width: 30%; 
 
    height: 70px; 
 
    float: left; 
 
} 
 

 
.logo { 
 
    display: inline-block; 
 
    font-family: "Trebuchet MS", "Lucida Grande", "Lucida Sans Unicode", "Lucida Sans", Tahoma, sans-serif; 
 
    color: #2C3E50; 
 
    position: absolute; 
 
} 
 

 
.logoimg { 
 
    height: 70px; 
 
    float: left; 
 
} 
 

 
.logotext { 
 
    font-weight: 600; 
 
    float: right; 
 
    line-height: 70px; 
 
} 
 

 
.logotext>span { 
 
    color: white; 
 
    text-shadow: 2px 2px 2px #33425B; 
 
} 
 

 
.navMenu { 
 
    float: right; 
 
    text-align: center; 
 
    overflow: hidden; 
 
} 
 

 
.navMenu>ul { 
 
    list-style: none; 
 
} 
 

 
.navMenu>ul>li { 
 
    display: inline-block; 
 
    line-height: 70px; 
 
} 
 

 
.navMenu>ul>li>a>span { 
 
    color: white; 
 
    font-weight: 700; 
 
    font-size: 17px 
 
} 
 

 
.navMenu>ul>li>a { 
 
    text-decoration: none; 
 
    color: #2C3E50; 
 
    font-family: "Trebuchet MS", "Lucida Grande", "Lucida Sans Unicode", "Lucida Sans", Tahoma, sans-serif; 
 
    font-weight: 600; 
 
    margin: 10px 
 
} 
 

 
.navMenu>ul>li>a:hover { 
 
    color: snow; 
 
}

<div class="navSection"> 
 
     <div class="navSectionWrapper"> 
 
      <div class="navlogo"> 
 
       <a href="#" class="homelink"> 
 
        <div class="logo"> 
 
         <img src="img/logo.png" class="logoimg"> 
 
         <h2 class="logotext">Let's<span>Go</span></h2> 
 
        </div> 
 
       </a> 
 
      </div> 
 
      <div class="navMenu" id="mynavMenu"> 
 
       <ul> 
 
        <li><a href="#">Home</a></li> 
 
        <li><a href="#">Features</a></li> 
 
        <li><a href="#">About</a></li> 
 
        <li><a href="#">+<span>Download</span></a></li> 
 
        <li><a href="javascript:void(0);" class="icon" onclick="myFunction()">&#9776;</a></li> 
 
       </ul> 
 
      </div> 
 
     </div> 
 
    </div> 
 
<script> 
 
     function myFunction() { 
 
      var x = document.getElementById("mynavMenu"); 
 
      if (x.className === "navMenu") { 
 
       x.className += " responsive"; 
 
      } else { 
 
       x.className = "navMenu"; 
 
      } 
 
     } 
 
</script>

三江源

来源

2017-07-09 RadVolan

你的HTML使用a.icon但你在CSS与li.icon目标。将class="icon"移至li而不是a，并稍微修改了.icon的CSS。您在响应视图中隐藏了:not(:first-child())，并且您要么使用:not(:last-child)，因为.icon是:last-child，或者只是使用:not(.icon)。

.navSection { 
 
    width: 100%; 
 
    display: inline-table; 
 
    line-height: 30px; 
 
    background: #1c948a; 
 
    z-index: 3; 
 
    box-shadow: 0px 3px 5px 1px rgba(0, 0, 0, .3); 
 
} 
 

 
.navMenu .icon{ 
 
    display: none; 
 
    float: right; 
 
} 
 

 
@media screen and (max-width: 700px) { 
 
    .navMenu ul li:not(.icon) {display: none;} 
 
    .navMenu ul li.icon { 
 
    display: block; 
 
    } 
 
} 
 

 
@media screen and (max-width: 700px) { 
 
    .navMenu.responsive {position: relative;} 
 
    .navMenu.responsive .icon { 
 
    position: absolute; 
 
    right: 0; 
 
    top: 0; 
 
    } 
 
    .navMenu.responsive ul li { 
 
    float: none; 
 
    display: block; 
 
    text-align: left; 
 
    } 
 
} 
 

 
.navSectionWrapper { 
 
    width: 90%; 
 
    margin: auto; 
 
} 
 

 
.homelink { 
 
    text-decoration: none; 
 
} 
 

 
.navlogo { 
 
    width: 30%; 
 
    height: 70px; 
 
    float: left; 
 
} 
 

 
.logo { 
 
    display: inline-block; 
 
    font-family: "Trebuchet MS", "Lucida Grande", "Lucida Sans Unicode", "Lucida Sans", Tahoma, sans-serif; 
 
    color: #2C3E50; 
 
    position: absolute; 
 
} 
 

 
.logoimg { 
 
    height: 70px; 
 
    float: left; 
 
} 
 

 
.logotext { 
 
    font-weight: 600; 
 
    float: right; 
 
    line-height: 70px; 
 
} 
 

 
.logotext>span { 
 
    color: white; 
 
    text-shadow: 2px 2px 2px #33425B; 
 
} 
 

 
.navMenu { 
 
    float: right; 
 
    text-align: center; 
 
    overflow: hidden; 
 
} 
 

 
.navMenu>ul { 
 
    list-style: none; 
 
} 
 

 
.navMenu>ul>li { 
 
    display: inline-block; 
 
    line-height: 70px; 
 
} 
 

 
.navMenu>ul>li>a>span { 
 
    color: white; 
 
    font-weight: 700; 
 
    font-size: 17px 
 
} 
 

 
.navMenu>ul>li>a { 
 
    text-decoration: none; 
 
    color: #2C3E50; 
 
    font-family: "Trebuchet MS", "Lucida Grande", "Lucida Sans Unicode", "Lucida Sans", Tahoma, sans-serif; 
 
    font-weight: 600; 
 
    margin: 10px 
 
} 
 

 
.navMenu>ul>li>a:hover { 
 
    color: snow; 
 
}

<div class="navSection"> 
 
     <div class="navSectionWrapper"> 
 
      <div class="navlogo"> 
 
       <a href="#" class="homelink"> 
 
        <div class="logo"> 
 
         <img src="img/logo.png" class="logoimg"> 
 
         <h2 class="logotext">Let's<span>Go</span></h2> 
 
        </div> 
 
       </a> 
 
      </div> 
 
      <div class="navMenu" id="mynavMenu"> 
 
       <ul> 
 
        <li><a href="#">Home</a></li> 
 
        <li><a href="#">Features</a></li> 
 
        <li><a href="#">About</a></li> 
 
        <li><a href="#">+<span>Download</span></a></li> 
 
        <li class="icon"><a href="javascript:void(0);" onclick="myFunction()">&#9776;</a></li> 
 
       </ul> 
 
      </div> 
 
     </div> 
 
    </div> 
 
<script> 
 
     function myFunction() { 
 
      var x = document.getElementById("mynavMenu"); 
 
      if (x.className === "navMenu") { 
 
       x.className += " responsive"; 
 
      } else { 
 
       x.className = "navMenu"; 
 
      } 
 
     } 
 
</script>

来源

2017-07-09 14:48:44

谢谢！我明白了，但我对于“你的HTML使用a.icon但是你使用li.icon在CSS中定位”这部分有点不清楚。“哪里是？为什么你要添加float：right to .navMenu .icon CSS？这是必要的吗？ – RadVolan

@RadVolan不用客气。 '

☰

' - 类'.icon'在'a'上，但是你的css选择器是'.navMenu ul li.icon' - 所以你试图把css应用到'li.icon'，你的html是实际上'a.icon' - 有意义吗？ –

是的，所以我可以使它与'a' - >'

☰

'中的图标类一起使用并使用'.navMenu a.icon'？对？ – RadVolan

汉堡菜单不显示在响应式导航栏

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