jQuery导航菜单

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html

<h1>Solution for Long Drop Down Items</h1>

<nav>
<ul class="dropdown">
        	<li class="drop"><a href="#">Really Tall Menu</a>
        		<ul class="sub_menu">
							<li><a href="#">Lorem</a></li>
							<li><a href="#">Ipsum</a></li>
							<li><a href="#">Dolor</a></li>
							<li><a href="#">Lipsum</a></li>
							<li><a href="#">Consectetur </a></li>
							<li><a href="#">Duis</a></li>
							<li><a href="#">Sed</a></li>
							<li><a href="#">Natus</a></li>
							<li><a href="#">Excepteur</a></li>
							<li><a href="#">Voluptas</a></li>
							<li><a href="#">Voluptate</a></li>
							<li><a href="#">Malorum</a></li>
							<li><a href="#">Bonorum</a></li>
							<li><a href="#">Nemo</a></li>
							<li><a href="#">Quisquam</a></li>
							<li><a href="#">Adipisci </a></li>
							<li><a href="#">Excepteur</a></li>
							<li><a href="#">Consectetur </a></li>
							<li><a href="#">Duis</a></li>
							<li><a href="#">Voluptate</a></li>
							<li><a href="#">Ipsum</a></li>
							<li><a href="#">Dolor</a></li>
							<li><a href="#">Lipsum</a></li>
        		</ul>
        	</li>
        	<li class="drop"><a href="#">Kinda Tall Menu</a>
        		<ul class="sub_menu">
        			<li><a href="#">Lorem</a></li>
							<li><a href="#">Ipsum</a></li>
							<li><a href="#">Dolor</a></li>
							<li><a href="#">Lipsum</a></li>
							<li><a href="#">Consectetur </a></li>
							<li><a href="#">Duis</a></li>
							<li><a href="#">Sed</a></li>
							<li><a href="#">Natus</a></li>
							<li><a href="#">Excepteur</a></li>
							<li><a href="#">Voluptas</a></li>
							<li><a href="#">Voluptate</a></li>
							<li><a href="#">Malorum</a></li>
							<li><a href="#">Bonorum</a></li>
							<li><a href="#">Nemo</a></li>
							<li><a href="#">Quisquam</a></li>
							
        		</ul>
        	</li>
        	<li class="drop"><a href="#">Average Menu</a>
        		<ul class="sub_menu">
        			<li><a href="#">Lorem</a></li>
							<li><a href="#">Ipsum</a></li>
							<li><a href="#">Dolor</a></li>
							<li><a href="#">Lipsum</a></li>
							<li><a href="#">Consectetur </a></li>
        		</ul>
        	</li>
        	<li><a href="#">No Menu</a>
        	</li>
        </ul>
</nav>

css

body{
  margin: 0px;
  padding: 0px;
  background: #e74c3c;
  font-family: 'Lato', sans-serif;
}

h1{
  margin: 2em 0px;
  padding: 0px;
  color: #fff;
  text-align: center;
  font-weight: 100;
  font-size: 50px;
}

nav{
  width: 750px;
  margin: 1em auto;
}

ul{
  margin: 0px;
  padding: 0px;
  list-style: none;
}

ul.dropdown{ 
  position: relative; 
  width: 100%; 
}

ul.dropdown li{ 
  font-weight: bold; 
  float: left; 
  width: 180px; 
  position: relative;
  background: #ecf0f1;
}

ul.dropdown a:hover{ 
  color: #000; 
}

ul.dropdown li a { 
  display: block; 
  padding: 20px 8px;
  color: #34495e; 
  position: relative; 
  z-index: 2000; 
  text-align: center;
  text-decoration: none;
  font-weight: 300;
}

ul.dropdown li a:hover,
ul.dropdown li a.hover{ 
  background: #3498db;
  position: relative;
  color: #fff;
}

ul.dropdown ul{ 
 display: none;
 position: absolute; 
  top: 0; 
  left: 0; 
  width: 180px; 
  z-index: 1000;
}

ul.dropdown ul li { 
  font-weight: normal; 
  background: #f6f6f6; 
  color: #000; 
  border-bottom: 1px solid #ccc; 
}

ul.dropdown ul li a{ 
  display: block; 
  color: #34495e !important;
  background: #eee !important;
}

ul.dropdown ul li a:hover{
  display: block; 
  background: #3498db !important;
  color: #fff !important;
}

.drop > a{
  position: relative;
}

.drop > a:after{
  content:"";
  position: absolute;
  right: 10px;
  top: 40%;
  border-left: 5px solid transparent;
  border-top: 5px solid #333;
  border-right: 5px solid transparent;
  z-index: 999;
}

.drop > a:hover:after{
  content:"";
   border-left: 5px solid transparent;
  border-top: 5px solid #fff;
  border-right: 5px solid transparent;
}

JavaScript

var maxHeight = 400;

$(function(){

$(".dropdown > li").hover(function() {
    
         var $container = $(this),
             $list = $container.find("ul"),
             $anchor = $container.find("a"),
             height = $list.height() * 1.1,       // make sure there is enough room at the bottom
             multiplier = height / maxHeight;     // needs to move faster if list is taller
        
        // need to save height here so it can revert on mouseout            
        $container.data("origHeight", $container.height());
        
        // so it can retain it's rollover color all the while the dropdown is open
        $anchor.addClass("hover");
        
        // make sure dropdown appears directly below parent list item    
        $list
            .show()
            .css({
                paddingTop: $container.data("origHeight")
            });
        
        // don't do any animation if list shorter than max
        if (multiplier > 1) {
            $container
                .css({
                    height: maxHeight,
                    overflow: "hidden"
                })
                .mousemove(function(e) {
                    var offset = $container.offset();
                    var relativeY = ((e.pageY - offset.top) * multiplier) - ($container.data("origHeight") * multiplier);
                    if (relativeY > $container.data("origHeight")) {
                        $list.css("top", -relativeY + $container.data("origHeight"));
                    };
                });
        }
        
    }, function() {
    
        var $el = $(this);
        
        // put things back to normal
        $el
            .height($(this).data("origHeight"))
            .find("ul")
            .css({ top: 0 })
            .hide()
            .end()
            .find("a")
            .removeClass("hover");
    
    });  
    
});

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