如何制作响应式导航菜单？

Question

我正在尝试遵循this tutorial，但导航菜单无法正常工作。 I have also watched this tutorial，其中讲师指出，通过将位置更改为静态，可以使其响应并在移动设备上看起来整洁。我试图将子菜单更向右移动，并将其更改回绝对位置，大约为150px，但是我的游戏菜单无法正常工作...

我还注意到，如果我将左侧位置更改为200像素左右，那么效果会更好，但这离左侧太远了：

* {
    margin: 0px;
    padding: 0px;
}

body {
    font-family: verdana;
    background-color: #abc;
    padding: 50px;
}

h1 {
    text-align: center;
    border-bottom: 2px solid #009;
    margin-bottom: 50px;
}

/* Rules for navigation menu */

ul#navmenu, ul.sub1  , ul.sub2 {
    list-style: none;

    font-size: 12px;
}

ul#navmenu li {

    width: 250px;
    text-align: center;
    position: relative; /*This is very important to get sub menu absolutely line up with it */
    float: left; /*Get elements side by side */
    margin-right: 4px;

}

ul#navmenu a {
    text-decoration: none;
    display: block;
    width: 250px;
    height: 25px;
    line-height: 25px;
    background-color: #fff;
    border: 1px solid #ccc;
    border-radius: 5px;
}



ul#navmenu .sub1 a {
    margin-top: 5px;
}

ul#navmenu .sub2 a {
    margin-left: 10px;
}

ul#navmenu li:hover > a {       /* > child selector */
    background-color: #cfc;

}

ul#navmenu li:hover a:hover {
    background-color: #ff0;
}


ul#navmenu ul.sub1 {
    display: none;
    position: absolute;
    top: 26px;
    left: 0px;
}

ul#navmenu ul.sub2 {
    display: none;
    position: absolute;
    top: 0px;
    left: 251px;
}

ul#navmenu li:hover .sub1 {
    display: block;
}

ul#navmenu .sub1 li:hover .sub2 {
    display:block;
}

.darrow {
    font-size: 14px;
    position: absolute;
    top: 5px;
    right: 4px;
}

.rarrow {
    font-size: 14px;
    position: absolute;
    top: 8px;
    right: 4px;
}

@media screen and (max-width: 600px) {
    ul#navmenu li {

    width: 250px;
    text-align: center;
    position: relative; /*This is very important to get sub menu absolutely line up with it */
    float: center; 
    margin-right: 4px;

}

ul#navmenu a {
    text-decoration: none;
    display: block;
    width: 100px;
    height: 50px;
    line-height: 25px;
    background-color: #fff;
    border: 1px solid #ccc;
    border-radius: 5px;
}



ul#navmenu .sub1 a {
    margin-top: 5px;

}

ul#navmenu .sub2 a {
    margin-left: 10px;
}





ul#navmenu ul.sub1 {
    display: none;
    position: absolute;
    left: 150px;
    top: -50px;


}



ul#navmenu ul.sub2 {
    display: none;
    position: static;


}

ul#navmenu li:hover .sub1 {
    display: block;
}

ul#navmenu .sub1 li:hover .sub2 {
    display:block;
}
.darrow {
    display: none;
}

.rarrow {
    display: none;
}
}

Answer 1

  

如何进行响应式导航菜单

尝试以下方法。它仅使用HTML和CSS。

body { 
  background: #ccc;
  font-family: helvetica, arial, serif;
  font-size: 13px;
  text-transform: uppercase;
  text-align: center;
}
 
.wrap {
  display: inline-block;
  -webkit-box-shadow: 0 0 70px #fff;
  -moz-box-shadow: 0 0 70px #fff;
  box-shadow: 0 0 70px #fff;
  margin-top: 40px;
}

/* a little "umph" */
.decor {
  background: #6EAF8D;
  background: -webkit-linear-gradient(left, #CDEBDB 50%, #6EAF8D 50%);
  background: -moz-linear-gradient(left, #CDEBDB 50%, #6EAF8D 50%);
  background: -o-linear-gradient(left, #CDEBDB 50%, #6EAF8D 50%);
  background: linear-gradient(left, white 50%, #6EAF8D 50%);
  background-size: 50px 25%;;
  padding: 2px;
  display: block;
}

a {
  text-decoration: none;
  color: #fff;
  display: block;
}

ul {
  list-style: none;
  position: relative;
  text-align: left;
}

li {
  float: left;
}

/* clear'n floats */
ul:after {
  clear: both;
}

ul:before,
ul:after {
    content: " ";
    display: table;
}

nav {
  position: relative;
  background: #2B2B2B;
  background-image: -webkit-linear-gradient(bottom, #2B2B2B 7%, #333333 100%);
  background-image: -moz-linear-gradient(bottom, #2B2B2B 7%, #333333 100%);
  background-image: -o-linear-gradient(bottom, #2B2B2B 7%, #333333 100%);
  background-image: linear-gradient(bottom, #2B2B2B 7%, #333333 100%);
  text-align: center;
  letter-spacing: 1px;
  text-shadow: 1px 1px 1px #0E0E0E;
  -webkit-box-shadow: 2px 2px 3px #888;
  -moz-box-shadow: 2px 2px 3px #888;
  box-shadow: 2px 2px 3px #888;
  border-bottom-right-radius: 8px;
  border-bottom-left-radius: 8px;
}

/* prime */
ul.primary li a {
  display: block;
  padding: 20px 30px;
  border-right: 1px solid #3D3D3D;
}

ul.primary li:last-child a {
  border-right: none;
}

ul.primary li a:hover {
  
  color: #000;
}

/* subs */
ul.sub {
  position: absolute;
  z-index: 200;
  box-shadow: 2px 2px 0 #BEBEBE;
  width: 35%;
  display:none;
}

ul.sub li {
  float: none;
  margin: 0;
}

ul.sub li a {
  border-bottom: 1px dotted #ccc;
  border-right: none;
  color: #000;
  padding: 15px 30px;
}

ul.sub li:last-child a {
  border-bottom: none;
}

ul.sub li a:hover {
  color: #000;
  background: #eeeeee;
}

/* sub display*/
ul.primary li:hover ul {
  display: block;
  background: #fff;
}

/* keeps the tab background white */
ul.primary li:hover a {
  background: #fff;
  color: #666;
  text-shadow: none;
}

ul.primary li:hover > a{
  color: #000;
} 

@media only screen and (max-width: 600px) {
  .decor {
    padding: 3px;
  }
  
  .wrap {
    width: 100%;
    margin-top: 0px;
  }
  
   li {
    float: none;
  }
  
  ul.primary li:hover a {
    background: none;
    color: #8B8B8B;
    text-shadow: 1px 1px #000;
  }

  ul.primary li:hover ul {
    display: block;
    background: #272727;
    color: #fff;
  }
  
  ul.sub {
    display: block;  
    position: static;
    box-shadow: none;
    width: 100%;
  }
  
  ul.sub li a {
    background: #272727;
  	border: none;
    color: #8B8B8B;
  }
  
  ul.sub li a:hover {
    color: #ccc;
    background: none;
  }
}

<head>
  <meta name="viewport" content="width=device-width">
</head>
<div class="wrap">
<span class="decor"></span>
<nav>
  <ul class="primary">
    <li>
      <a href="">Dog</a>
      <ul class="sub">
        <li><a href="">Bulldog</a></li>
        <li><a href="">Mastiff</a></li>
        <li><a href="">Labrador</a></li>
        <li><a href="">Mutt</a></li>
      </ul>
    </li>
    <li>
      <a href="">Cat</a>
      <ul class="sub">
        <li><a href="">Tabby</a></li>
        <li><a href="">Black Cat</a></li>
        <li><a href="">Wrinkly Cat</a></li>
      </ul>
    </li>
    <li>
      <a href="">Bird</a>
      <ul class="sub">
        <li><a href="">Humming Bird</a></li>
        <li><a href="">Hawk</a></li>
        <li><a href="">Crow</a></li>
      </ul>  
    </li>
    <li>
      <a href="">Horse</a>
      <ul class="sub">
        <li><a href="">Brown Horse</a></li>
        <li><a href="">Race Horse</a></li>
        <li><a href="">Tall Horse</a></li>
      </ul>  
    </li>
    <li>
      <a href="">Burger</a>
      <ul class="sub">
        <li><a href="">Cheesy</a></li>
        <li><a href="">More Ketchup</a></li>
        <li><a href="">Some Mustard</a></li>
        <li><a href="">Extra Butter</a></li>
      </ul>  
    </li>
  </ul>
</nav>
</div>