CSS美化下拉框select在火狐和谷歌浏览器下已测试

<div class="select">
<div class="select_default"></div>
<!--这边是默认展示我们选中的框-->
<ul class="select_item">
<!--实则所有的下拉选项隐藏了，在这个ul中-->
<li>Complex</li>
<li>Knowledge</li>
<li>Case</li>
<li>Article</li>
<li>News</li>
</ul>
</div>

*{
margin:0;
padding:0;
}
body{
margin:0;
padding:0;
font:normal 12px Arial, Helvetica, sans-serif;
}
.select{
width:100px;
position:relative;
top:100px;
left:100px;
cursor:pointer;
}
.select_default{
width:80px;
height:32px;
line-height:32px;
padding:0 10px;
border:solid 1px #ccc;
}
/*这边就是三角形的css代码，使用伪类和定位实现右三角*/
.select_default:after{
content:"";
border-left:5px solid transparent;
border-right:5px solid transparent;
border-bottom:5px solid #999;
-webkit-transform-origin:5px 2.5px;
-moz-transform-origin:5px 2.5px;
-ms-transform-origin:5px 2.5px;
-o-transform-origin:5px 2.5px;
transform-origin:5px 2.5px;
-webkit-transition: all .5s ease;
-moz-transition: all .5s ease;
-ms-transition: all .5s ease;
-o-transition: all .5s ease;
transition: all .5s ease;
position:absolute;
right:5px;
top:14px;
}
.select_default.rotate:after{
-webkit-transform:rotate(180deg);
-moz-transform:rotate(180deg);
-ms-transform:rotate(180deg);
-o-transform:rotate(180deg);
transform:rotate(180deg);
}
.select_item{
margin:0;
padding:0;
display:none;
list-style:none;
}
.select_item li{
width:80px;
height:32px;
line-height:32px;
padding:0 10px;
border:solid 1px #ccc;
border-top:none;
}
.select_item li.hover{
background:#666;
color:#fff;
}

$(document).ready(function(){
var $sel = $(".select"),
$sel_default = $(".select_default"),
$sel_item = $(".select_item"),
$sel_item_li = $(".select_item li")
$sel_default.text($(".select_item li:first").text());
//alert();
$sel.hover(function(){
$sel_item.show();
$sel_default.addClass("rotate");
$sel_item_li.hover(function(){
$index = $sel_item_li.index(this);
//alert($index)
$sel_item_li.eq($index).addClass("hover");
},function(){
$sel_item_li.removeClass("hover");
})
},function(){
$sel_item.hide();
$sel_default.removeClass("rotate");
});
$sel_item_li.click(function(){
$sel_default.text($(this).text());
$sel_item.hide();
});
});