html代码：
<body>
<div class="select">
<p data-value="所以选项">用户中心</p>
<ul>
<li data-value="个人资料" >个人资料</li>
<li data-value="密码修改">密码修改</li>
<li data-value="我的订单">我的订单</li>
<li data-value="退出">退出</li>
</ul>
</div>
</body>
css代码：
<style>
.select{
120px;
height: 40px;
background: #ff8;
margin: 0px auto;
position: relative;
cursor: pointer;
}
.select::after{
content: "";
display: block;
10px;
height: 10px;
border-left: 1px solid #D0D0D0;
border-bottom: 1px solid #D0D0D0;
top: 12px;
right: 12px;
position: absolute;
transform: rotate(-46deg);
transition: all .3s ease-in;
}
.select p{
120px;
line-height: 40px;
font-size: 16px;
font-family: "microsoft yahei";
color: #666666;
padding: 0px 15px;
}
.select ul{
100px;
display: block;
font-size: 16px;
background: #FFFFFF;
position: absolute;
top: 40px;
left: 0px;
max-height: 0px;
overflow: hidden;
transition: max-height .3s ease-in;
}
.select ul li{
100%;
height: 30px;
line-height: 30px;
padding: 0px 15px;
list-style: none;
color: #666666;
}
.select ul li.Selected{
background: yellowgreen;
color: #FFFFFF;
}
.select ul li:hover{
background: #D0D0D0;
}
@-webkit-keyframes slide-down{
0%{transform: scale(1,0);}
25%{transform: scale(1,1.2);}
50%{transform: scale(1,0.85);}
75%{transform: scale(1,1.05);}
100%{transform: scale(1,1);}
}
.select.open ul{
max-height: 250px;
transform-origin: 50% 0;
-webkit-animation: slide-down .5s ease-in;
transition: max-height .2s ease-in;
}
.select.open::after{
transform: rotate(134deg);
transition: all .3s ease-in;
top: 18px;
}
</style>
js代码：
<script>
$(function(){
$(".select p").click(function(e){
$(".select").toggleClass('open');
e.stopPropagation();
});
$(".content .select ul li").click(function(e){
var _this=$(this);
$(".select > p").text(_this.attr('data-value'));
_this.addClass("Selected").siblings().removeClass("Selected");
$(".select").removeClass("open");
e.stopPropagation();
});
$(document).on('click',function(){
$(".select").removeClass("open");
})
});
</script>