jQuery+CSS实现菜单滑动伸展收缩(仿淘宝)

功能很实用，代码非常的简单

效果1.

效果2.

样式代码如下：

body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,br,pre,form,fieldset,input,textarea,p,blockquote,th,td{ 
margin:0; 
padding:0 
} 
span{ 
color:#FF2B13 
} 
a{ 
text-decoration:none; 
color:#515050 
} 
a:hover{ 
text-decoration:underline; 
color:red 
} 
.box_all{ 
overflow:hidden; 
width:350px; 
font-family:"微软雅黑"; 
font-size:14px; 
border:1px solid #EEEEEE; 
border-top:2px solid #F57A04; 
padding:0 0 10px 0; 
margin:0 auto 
} 
.box{ 
padding-left:45px; 
padding-top:5px 
} 
.box li{ 
line-height:20px; 
margin-right:30px; 
width:120px; 
text-align:left; 
float:left; 
list-style-type:none 
} 
.boxdown{ 
cursor:pointer; 
border:1px solid #EEEEEE; 
width:60px; 
height:14px; 
background:#FFFFFF url(../images/down.png) no-repeat 20px; 
margin-left:150px; 
margin-top:-2px; 
border-top:none; 
margin:0 auto 
} 
.up{ 
cursor:pointer; 
border:1px solid #EEEEEE; 
width:60px; 
height:14px; 
background:#FFFFFF url(../images/up.png) no-repeat 20px; 
margin-left:150px; 
margin-top:-2px; 
border-top:none; 
margin:0 auto 
}

js主要代码如下：

$(document).ready(function(){ 
var a =$(".box ul li:gt(3):not(:last)"); 
a.hide(); 
$(".boxdown").click(function(){ 
if(a.is(':visible')){ 
a.slideUp('fast'); 
$(this).removeClass('up'); 
}else{ 
a.slideDown('fast').show(); 
$(this).addClass('up'); 
} 
}); 
});