基于HTML/CSS/JS原生实现Select下拉框美化与交互

<div id="type" class="test">
 <span>投资种类</span>
 <ul class="dropdown">
 <li>期货</li>
 <li>股票</li>
 <li>期权</li>
 </ul>
</div>
<div id="kind" class="test">
 <span>投资类型</span>   
 <ul class="dropdown">
 <li>趋势</li>
 <li>震荡</li>
 <li>套利</li>
 <li>选股</li>
 <li>择时</li>
 </ul>
</div>

ul li{
 list-style: none;
}
.test {
 position: relative;
 float: left;
 width: 120px;
 height: 40px;
 padding-left: 11px;
 font-size: 15px;
 line-height: 40px;
 cursor: pointer;
 border: 1px solid #d2d2d2;
 border-radius: 3px;
 margin-right: 20px;
 outline: none;
}
.test:before {
 position: absolute;
 right: 13px;
 top: 18px;
 width: 0;
 height: 0;
 content: "";
 border-width: 8px 8px 0 8px;
 border-style: solid;
 border-color: #d36969 transparent;
 -webkit-transition: transform .25s;
 -moz-transition: transform .25s;
 -ms-transition: transform .25s;
  -o-transition: transform .25s;
  transition: transform .25s;
}
.test:after {
 position: absolute;
 right: 15px;
 top: 18px;
 width: 0;
 height: 0;
 content: "";
 border-width: 6px 6px 0 6px;
 border-style: solid;
 border-color: #fff transparent;
 -webkit-transition: all .25s;
 -moz-transition: all .25s;
 -ms-transition: all .25s;
  -o-transition: all .25s;
  transition: all .25s;
}
.test.active:before{
 -webkit-transform: rotate(180deg);
 -moz-transform: rotate(180deg);
 -ms-transform: rotate(180deg);
  -o-transform: rotate(180deg);
  transform: rotate(180deg); 
}
.test.active:after{
 top: 20px;
 -webkit-transform: rotate(180deg);
 -moz-transform: rotate(180deg);
 -ms-transform: rotate(180deg);
  -o-transform: rotate(180deg);
  transform: rotate(180deg); 
}
.test .dropdown {
 position: absolute;
 right: 0;
 left: 0;
 display: none;
 padding: 0;
 border-radius: inherit;
 border: 1px solid #d2d2d2;
 box-shadow: 2px 2px 5px rgba(0,0,0,.4);
}
.test.active .dropdown {
 display: block;
}
.test .dropdown:before {
 position: absolute;
 right: 13px;
 bottom: 100%;
 width: 0;
 height: 0;
 content: "";
 border-width: 0 8px 8px 8px;
 border-style: solid;
 border-color: #d2d2d2 transparent;
}
.test .dropdown:after {
 position: absolute;
 right: 15px;
 bottom: 100%;
 width: 0;
 height: 0;
 content: "";
 border-width: 0 6px 6px 6px;
 border-style: solid;
 border-color: #fff transparent;
}
.test .dropdown li {
 float: left;
 width: 129px;
 font-size: 14px;
 -webkit-transition: all .3s ease-out;
 -moz-transition: all .3s ease-out;
 -ms-transition: all .3s ease-out;
  -o-transition: all .3s ease-out;
  transition: all .3s ease-out;
 text-align: center;
}
.test .dropdown li:first-of-type {
 border-radius: 3px 3px 0 0;
}
.test .dropdown li:last-of-type {
 border-radius: 0 0 3px 3px;
}
.test .dropdown li:hover {
 color: #fff;
 background: #c43c3d;
}

function DropDown(el) {
 this.dd = el;
 this.span = this.dd.children('span');
 this.li = this.dd.find('ul.dropdown li');
 this.val = '';
}
DropDown.prototype.initEvents = function() {
 var obj = this;
 obj.dd.on('click', function(event){
 $(this).toggleClass('active').siblings().removeClass('active');
 event.stopPropagation();
 });
 obj.li.on('click', function() {
 var opt = $(this);
 obj.val = opt.html();
 if (obj.span.html() == obj.val) return;   
 obj.span.html(obj.val);
 $(document).click(function() {
  $('.test').removeClass('active');
 });
 })
}
var test1 = new DropDown($('#type'));
var test2 = new DropDown($('#kind'));
test1.initEvents();
test2.initEvents()