我的菜单有问题

Question

我希望以下问题不会让你头疼，因为对我来说已经太晚了。无论如何，我正在为我的网站创建一个菜单但是有一个问题：当你切换到移动视图时，菜单显示在第一页的顶部，当你按下汉堡包图标时，它会显示在它下面。它根本不应该显示，只有当按下按钮时，当切换到移动视图时，你也会看到一个奇怪的动画。

HTML：

<header>
<nav>
<ul id="nav" style="top:-15rem;">
<li class="nav_link"><a href="#">HOME</a></li>
<li class="nav_link"><a href="#">ABOUT</a></li>
<li class="nav_link"><a href="#">WORK</a></li>
<li class="nav_link"><a href="#">CONTACT</a></li>       
</ul>
<div id="bg_fix" class="shadow_on">
<a id="logo"> <span class="font">Nadia</span> <img src="images/logo.png" alt="logo"></a>
<div id="burger"> <span></span> <span></span> <span></span> </div>
</div>
</nav>
</header>

CSS：

p, h1, h2, h3, h4, li, a, button {
  font-family: 'Montserrat', sans-serif;
  font-size: 1rem;
  color: #3d3d3d;
}

a {
  text-decoration: none;
}

.font {
  font-family:'Montserrat', sans-serif;
  font-size:30px;
}

header {
  background-color: #ffffff;
  display: inline;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index:100;
}

#bg_fix {
  padding: 0.5em 1em 0.5em;
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  background-color: #ffffff;
  z-index: 1;
  transition: all 0.7s ease-in-out;
}


.shadow_on {
  -webkit-box-shadow: box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
  -moz-box-shadow: box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
  box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
}


#nav {
  transition: all 0.7s ease-in-out;
  position: absolute;
  top:-15rem;
  background-color: #ffffff;
  left: 0;
  right: 0;
  padding:0;
  -webkit-box-shadow: box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
  -moz-box-shadow: box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
  box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
}

#nav li {
  cursor: pointer;
  display: block;
  border-bottom: 1px #E5E5E5 solid;
  text-decoration: none;
  text-align: center;
  color: #3d3d3d;
  padding: 1rem 0;
  background-color: #ffffff;
  -webkit-touch-callout: none;
  -webkit-user-select: none; 
  -khtml-user-select: none;
  -moz-user-select: none; 
  -ms-user-select: none;
  user-select: none; 
}


#nav li:last-child {
  border-bottom: 0;
}

#nav li:active {
  background-color: #E5E5E5;
}

#logo {
  display: inline-block;
  cursor: pointer;
}

#logo img {
  height: 2rem;
}

#burger {
  margin-top: 0.6rem;
  float: right;
  display: inline;
  width: 1.4em;
  vertical-align: middle;
  -webkit-transition: .5s ease-in-out;
  -moz-transition: .5s ease-in-out;
  -o-transition: .5s ease-in-out;
  transition: .5s ease-in-out;
  cursor: pointer;
}

#burger span {
  display: block;
  height: 0.15rem;
  margin-top: 0.3rem;
  width: 100%;
  background-color: #3d3d3d;
  opacity: 1;
  left: 0;
  -webkit-transition: .1s ease-in-out;
  -moz-transition: .1s ease-in-out;
  -o-transition: .1s ease-in-out;
  transition: .1s ease-in-out;
}

#burger span:first-child {
  margin-top: 0;
}

#burger.open span {
  background-color: #2C9FD1;
}

@media (min-width: 44em) {

header {
  -webkit-box-shadow: box-shadow: 0px 0.1em 0.2em -0.2em rgba(61,61,61,0.37);
   -moz-box-shadow: box-shadow: 0px 0.1em 0.2em -0.2em rgba(61,61,61,0.37);
    box-shadow: 0px 0.25em 0.2em -0.2em rgba(61,61,61,0.37);
    z-index: 1;
  }

nav {
  max-width: 95rem;
  display: block;
  margin: 0 auto;
}

#burger {
  display: none;
}

#logo {
  float: right;
  padding: 0.5rem 0;
  margin-right: 2rem;
  margin-top: 0.2rem;
}

#nav {
  padding: 0.5rem 0;
  transition: none;
  top: 0 !important;
  position: static;
  display: inline-block;
  width: 70%;
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
  margin-left: 3rem;
  margin-top: 1.4rem;
  padding: 0;
}

  #nav li {
    border-bottom: 0;
    margin-right: 2.5rem;
    font-size: 1.1rem;
    transition: all 0.1s ease-in-out;
    display: inline-block;
    position: relative;
    padding: 0.3rem 0;
  }

  #nav li {
    display: inline;
  }

  #nav li:active {
    background-color: #ffffff;
  }

  #nav li:hover a, #nav li:active a{
    opacity:0.5;
  }

  #bg_fix {
    transition: none;
    padding: 0;
    display: inline;
    position: static;
  }

  #logo {
    margin-top: 0.1rem;
    padding: 0.7rem 0;
  }

  #logo img {
    height: 2.3rem;
  }
}

JS：

var burger = document.getElementById("burger");
var nav = document.getElementById("nav");
var navLinks = document.getElementsByClassName("nav_link");
var bgFix = document.getElementById("bg_fix");
var logo = document.getElementById("logo");

burger.onclick = function() {
    burger.classList.toggle("open");
    bgFix.classList.toggle("shadow_on");
    if (nav.style.top === "-15rem") {
        nav.style.top = "3rem";
    } else {
        nav.style.top = "-15rem";
    }
}

function markSelection() {
    burger.classList.toggle("open");
    bgFix.classList.toggle("shadow_on");
    nav.style.top = "-15rem";
}

for (i = 0, len=navLinks.length; i < len; i++) {
        navLinks[i].onclick = markSelection;
} 

小提琴：https://jsfiddle.net/gu0j8r57/ 这里很难看到，因为只有一个页面，但你可以定义看到菜单出现在菜单上方的页面上，它让我发疯，你可以在切换到移动视图时看到奇怪的动画。

编辑：更新了jsfiddle，以便您可以在移动视图上看到菜单显示在其上方

Answer 1

  

您需要标记#nav已打开。转型：全部0.7s轻松进出;应该只发生在＃nav.open

上

JS：（jsFiddler）

p, h1, h2, h3, h4, li, a, button {
  font-family: 'Montserrat', sans-serif;
  font-size: 1rem;
  color: #3d3d3d;
}

a {
  text-decoration: none;
}

.font {
  font-family:'Montserrat', sans-serif;
  font-size:30px;
}

header {
  background-color: #ffffff;
  display: inline;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index:100;
}

#bg_fix {
  padding: 0.5em 1em 0.5em;
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  background-color: #ffffff;
  z-index: 1;
  transition: all 0.7s ease-in-out;
}


.shadow_on {
  -webkit-box-shadow: box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
  -moz-box-shadow: box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
  box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
}


#nav {
 // transition: all 0.7s ease-in-out;
  position: absolute;
  top:-15rem;
  background-color: #ffffff;
  left: 0;
  right: 0;
  padding:0;
  -webkit-box-shadow: box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
  -moz-box-shadow: box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
  box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
}

#nav.open {
  transition: all 0.7s ease-in-out;
  position: absolute;
  top:-15rem;
  background-color: #ffffff;
  left: 0;
  right: 0;
  padding:0;
  -webkit-box-shadow: box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
  -moz-box-shadow: box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
  box-shadow: 0px 0.1em 0.2em 0px rgba(61,61,61,0.37);
}

#nav li {
  cursor: pointer;
  display: block;
  border-bottom: 1px #E5E5E5 solid;
  text-decoration: none;
  text-align: center;
  color: #3d3d3d;
  padding: 1rem 0;
  background-color: #ffffff;
  -webkit-touch-callout: none;
  -webkit-user-select: none; 
  -khtml-user-select: none;
  -moz-user-select: none; 
  -ms-user-select: none;
  user-select: none; 
}


#nav li:last-child {
  border-bottom: 0;
}

#nav li:active {
  background-color: #E5E5E5;
}

#logo {
  display: inline-block;
  cursor: pointer;
}

#logo img {
  height: 2rem;
}

#burger {
  margin-top: 0.6rem;
  float: right;
  display: inline;
  width: 1.4em;
  vertical-align: middle;
  -webkit-transition: .5s ease-in-out;
  -moz-transition: .5s ease-in-out;
  -o-transition: .5s ease-in-out;
  transition: .5s ease-in-out;
  cursor: pointer;
}

#burger span {
  display: block;
  height: 0.15rem;
  margin-top: 0.3rem;
  width: 100%;
  background-color: #3d3d3d;
  opacity: 1;
  left: 0;
  -webkit-transition: .1s ease-in-out;
  -moz-transition: .1s ease-in-out;
  -o-transition: .1s ease-in-out;
  transition: .1s ease-in-out;
}

#burger span:first-child {
  margin-top: 0;
}

#burger.open span {
  background-color: #2C9FD1;
}

@media (min-width: 44em) {

header {
  -webkit-box-shadow: box-shadow: 0px 0.1em 0.2em -0.2em rgba(61,61,61,0.37);
   -moz-box-shadow: box-shadow: 0px 0.1em 0.2em -0.2em rgba(61,61,61,0.37);
    box-shadow: 0px 0.25em 0.2em -0.2em rgba(61,61,61,0.37);
    z-index: 1;
  }

nav {
  max-width: 95rem;
  display: block;
  margin: 0 auto;
}

#burger {
  display: none;
}

#logo {
  float: right;
  padding: 0.5rem 0;
  margin-right: 2rem;
  margin-top: 0.2rem;
}

#nav {
  padding: 0.5rem 0;
  transition: none;
  top: 0 !important;
  position: static;
  display: inline-block;
  width: 70%;
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
  margin-left: 3rem;
  margin-top: 1.4rem;
  padding: 0;
}

  #nav li {
    border-bottom: 0;
    margin-right: 2.5rem;
    font-size: 1.1rem;
    transition: all 0.1s ease-in-out;
    display: inline-block;
    position: relative;
    padding: 0.3rem 0;
  }

  #nav li {
    display: inline;
  }

  #nav li:active {
    background-color: #ffffff;
  }

  #nav li:hover a, #nav li:active a{
    opacity:0.5;
  }

  #bg_fix {
    transition: none;
    padding: 0;
    display: inline;
    position: static;
  }

  #logo {
    margin-top: 0.1rem;
    padding: 0.7rem 0;
  }

  #logo img {
    height: 2.3rem;
  }
}

<强> CSS：

<header>
<nav>
<ul id="nav" style="top:-15rem;">
<li class="nav_link"><a href="#">HOME</a></li>
<li class="nav_link"><a href="#">ABOUT</a></li>
<li class="nav_link"><a href="#">WORK</a></li>
<li class="nav_link"><a href="#">CONTACT</a></li>       
</ul>
<div id="bg_fix" class="shadow_on">
<a id="logo"> <span class="font">Nadia</span> <img src="images/logo.png" alt="logo"></a>
<div id="burger"> <span></span> <span></span> <span></span> </div>
</div>
</nav>
</header>

HTML 我没有修改你的HTML

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