利用JS实现下拉框功能

  ="content-type"content=>  =>
    *{padding: 0;margin:0;}
    ul,li{list-style: none}
    .left{float: left;}
    .right{float: right;}
    .select_contain{font-size: 14px;color: #333;line-height: 38px;margin: 30px 0;}
    .select_item{margin-right: 50px;position: relative;}
    .select_tit{margin-right: 20px;}
    .select_result{width:  100px;line-height: 38px;border:1px solid #ccc;text-align:  center;border-radius: 4px;text-indent: -8px;cursor:pointer;}
    .select_result .triangle{border:5px solid transparent;border-top:5px solid #666;position: absolute;top: 16px; right:8px;}
    .select_item   ul{display:none;position:absolute;top:100%;right:0;width:100px;background:  #f3f3f3;border:1px solid #ccc;border-radius:0 0 4px 4px;  border-top-color:#f3f3f3;margin-top:-4px;}
    .select_item ul li{text-align: center;cursor: pointer;}
    .select_item ul li:hover{background: #f4a100; color: #fff;} 
  <scriptsrc=>=> 
<script>
function select(){
$(document).click(function(){
$(".select_module_con ul").slideUp();
})
var module=$(".select_result");
module.click(function(e){
e.stopPropagation();
var ul=$(this).next();
ul.stop().slideToggle();
ul.children().click(function(e){
e.stopPropagation();
$(this).parent().prev().children("span").text($(this).text());
ul.stop().slideUp();
})
})
}
$(function(){
select();
})
</script>
  ="select_contain">
      =>
        =>
   
        =>
          ="select_result">
            选择节目
            ="triangle">