js+css實現三級導航菜單

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本文實例為大傢分享瞭js+css實現三級導航菜單的具體代碼，供大傢參考，具體內容如下

導航菜單hover事件用css實現相對容易，隻需要將透明度更改即可，如果想要菜單有一個漸變的效果，然而可惜的是transition並不支持display，所以用opacity實現效果完全相同。

下面是用css實現的完整代碼：

<!DOCTYPE html>
<html>
 <head>
  <meta charset="utf-8" />
  <title>三級導航菜單</title>
 </head>
 <style>
  *{
 margin: 0;
 padding: 0;
}
body{
 font-size: 16px;
 background-color:#EDEDED ;
 font-style: inherit;
 color:#757576 ;
}
.main{
 width: 1050px;
 margin: 0 auto;
}
.fl{
 float: left;
}
.fr{
 float: right;
}
a{
 text-decoration: none;
 outline: none;
 color:#757576 ;
}
ul,ol{
 list-style: none;
}
.clear{ 
 clear: both;
}
.clearfix{
 *zoom:1;
}
li{
 float: left;
 display: inline-block;
 width: 120px;
 height: 40px;
 text-align: center;
 line-height: 40px;
}
li a:hover{
 color: red;
}
#frist {
 opacity: 0;
}
#frist li{
 float: none;
 position: relative;
}
 li a:hover{
 color: red;
 transition: all 0.5s;
}
:hover{
 transition: all 2s; 
}
#second {
 opacity: 0;
 margin: -40px 0 0 80px;
 padding: 0px;
 position: absolute;
}
#nav_one:hover #frist{
 opacity:1;
 transition: all 2s;
}
#nav_two:hover #second{
 opacity:1;
 transition: all 2s;
}
 </style>
 
 <body>
  <div class="nav main">
   <ul id="nav">
    <li id="nav_one"><a href="#" >一級</a>
     <ul id="frist">
      <li id="nav_two" class="nav_two">
       <a href="#" >二級</a>
       <ul id="second">
        <li><a href="#" >三級</a></li>
        <li><a href="#" >三級</a></li>
        <li><a href="#" >三級</a></li>
       </ul>
      </li>
      <li class="nav_two"><a href="#" >二級</a></li>
      <li class="nav_two"><a href="#" >二級</a></li>
     </ul>
    </li> 
    <li><a href="#" >一級</a></li>
    <li><a href="#" >一級</a></li>
    <li><a href="#" >一級</a></li>
    <li><a href="#" >一級</a></li>
   </ul>
 </div>  
 </body>
</html>

js實現的相對麻煩一點，但也可以，代替瞭css中hover效果。

<!--<script>
 window.onload = function(){
  var one = document.getElementById("nav_one");
  var frist = document.getElementById("frist");
  var second = document.getElementById("second");
   one.onmouseover = function(){
    frist.style.opacity = "1";
    frist.style.transition = "all 2s";
    frist.style.WebkitTransition = "all 2s";
   }
   one.onmouseout = function(){
    frist.style.opacity = "0";
    frist.style.transition = "all 0.5s";
    frist.style.WebkitTransition = "all 0.5s";
   }
  var two = document.getElementById("nav_two");
   two.onmouseover = function(){
    second.style.opacity = "1";
    second.style.transition = "all 2s";
    second.style.WebkitTransition = "all 2s";
   }
   two.onmouseout = function(){
    second.style.opacity = "0";
    second.style.transition = "all 0.5s";
    second.style.WebkitTransition = "all 0.5s";
   }
  }
</script>-->

以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。

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