jquery は独自のカスタム style_jquery を選択します

 .self-select-wrapper{ 
 position: relative;
 display: inline-block;
 border: 1px solid #d0d0d0;
 width: 250px;
 height:40px;
 font-size: 14px;
}
 
div.self-select-wrapper{
 /*解决IE67 块级元素不支持display:inline-block*/
 *display:inline;
}
 
.self-select-wrapper .self-select-display{
 display: inline-block;
 cursor: pointer;
 width:100%;
 height:40px;
 background: -moz-linear-gradient(top, #fff, #eee);
 background: -o-linear-gradient(top,#fff, #eee);
 background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#fff), to(#eee));
 filter: progid:DXImageTransform.Microsoft.Gradient(gradientType=0,startColorStr=#ffffff,endColorStr=#eeeeee);
}
 
.self-select-display .self-select-text{
 padding-left:10px;
 display: inline-block;
 line-height: 40px;
 width: 210px;
}
 
.self-select-display .self-select-arrow-down{
 height:0;
 width:0;
 overflow: hidden;
 font-size: 0;
 line-height: 0;
 display: inline-block;
 vertical-align: middle;
 border-color:#aaa transparent transparent transparent;
 border-style:solid dashed dashed dashed;
 border-width:7px;
}
 
.self-select-wrapper .self-select-ul{
 position: absolute;
 max-height:200px;
 _height:200px;
 border: 1px solid #ccc;
 background-color: #fff;
 top:41px;
 left:0px;
 overflow-y: auto;
 _overflow-y:auto !important;
 padding:0px;
 margin:0px;
 width: 100%;
 z-index:2014;
 display: none;
}
 
.self-select-wrapper .self-select-ul li{
 list-style: none;
}
 
.self-select-ul .self-select-option{
 line-height: 28px;
 cursor: pointer;
 display: block;
 padding-left:10px;
 text-decoration: none;
 color:#000;
}
 
.self-select-ul .self-select-option:hover,
.self-select-ul .current{
 background-color: #eee;
}

/**
 * 解决自定义select自定义样式需求
 * select父级元素谨慎使用z-index
 */
(function($){
 var tpl = '<div class="self-select-wrapper">'+
  '<span class="self-select-display">'+
  '<span class="self-select-text"></span>'+
  '<i class="self-select-arrow-down"></i>'+
  '</span>'+
  '<ul class="self-select-ul"></ul>'+
 '</div>';
 
 $.fn.selfSelect = function(changeHandler){
 var name = $(this).attr('name');
 var $selects = $(this);
 
 function getSourceData($options) {
 var text = [];
 var value = [];
 $.each($options, function() {
 text.push($(this).html());
 value.push($(this).attr('value'));
 });
 return {
 text: text,
 value: value
 };
 }
 
 function buildTpl($selfSelect, $select) {
 var valueArr =[];
 var textArr = [];
 var optionTpl = '';
 var $options = $select.find('option');
 var sourceData = getSourceData($options);
 valueArr = sourceData.value;
 textArr = sourceData.text;
 $select.hide();
 $selfSelect.find('.self-select-text').html(textArr[0]);
 $.each(textArr, function(seq, text) {
 optionTpl += '<li><a class="self-select-option" href="#" value="'+valueArr[seq]+'">'+text+'</a></li>';
 });
 $selfSelect.find('.self-select-ul').html(optionTpl);
 }
 
 function initSelect() {
 //解决多个select问题
 $.each($selects, function(i, selectEl) {
 var $selfSelect;
 var guid = Math.floor(Math.random()*100);
 var $select = $(selectEl);
 var $parent = $select.parent();
 if(!$select.prev().hasClass('self-select-wrapper')) {
  $select.before(tpl);
  $select.prev().addClass('select-' + guid);
  $selfSelect = $parent.find('.select-' + guid);
 }else {
  $selfSelect = $select.prev();
 }
 buildTpl($selfSelect, $select);
 initEvent($selfSelect, $select)
 });
 }
 
 function initEvent($selfSelect, $select) {
 $selfSelect.find('.self-select-display').off('click').on('click', function() {
 var $selfSelects = $('body').find('.self-select-wrapper');
 var isCliked = $(this).hasClass('clicked');
 if(isCliked) {
  $(this).removeClass('clicked');
  $selfSelect.find('.self-select-ul').slideUp('fast');
 }else {
  $(this).addClass('clicked');
  $selfSelect.find('.self-select-ul').slideDown('fast');
 }
 //防止z-index覆盖问题
 $.each($selfSelects, function(i, selectEl) {
  $(selectEl).css('z-index', 0);
 });
 $selfSelect.css('z-index', 1);
 });
 
 $selfSelect.find('.self-select-option').on('mousedown', function() {
 var text = $(this).html();
 var value = $(this).attr('value');
 $(this).parents('ul').slideUp('fast');
 $selfSelect.find('.self-select-display').removeClass('clicked');
 $selfSelect.find('.self-select-text').html(text);
 $(this).addClass('current');
 $(this).parent().siblings().children().removeClass('current');
 //修改select的值，并触发change事件
 $select.val(value);
 $select.trigger('change', value);
 });
 
 $(document).on('mousedown', function(e) {
 if($(e.target).hasClass('self-select-ul') || $(e.target).parent().hasClass('self-select-display')) return;
 $selfSelect.find('.self-select-display').removeClass('clicked');
 $selfSelect.find('.self-select-ul').slideUp('fast');
 });
 
 $select.on('change', function(e, val) {
 changeHandler && changeHandler(val);
 });
 }
 
 initSelect();
 
 return this;
 };
}(jQuery));