这个为什么点一级菜单没反应，二级菜单不显示出来啊
<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
.navlist{
position:absolute;
top:10px;
}
a{
text-decoration:none;
color:white;
}
.navlist a{
margin-left:270px;
color:#666;
}
.expand{
height:0px;
background-color:#333d4d;
overflow:hidden;
position:relative;
top:30px;
width:100%;
}
.expdiv{
height:130px;
width:500%;
}
.expdiv-list{
width:20%;
text-align:center;
float:left;
line-height:110px;
color:white;
}
.expand .close-btn{
width:120px;
height:20px;
background:url(file://D:/broswer_home.png) no-repeat -13px -117px;
position:absolute;
left:50%;
bottom:-2px;
margin-left:-60px;
cursor:pointer;
}
</style>
<script src="https://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript">
$(function(){
$("#menuList").on("click","a",function(){
if($(this).hasClass("btn-active")){
$("#expandZone #closeBtn").click();
return false;
}
var curIndex = $(this).index(),mlValue="-"+curIndex*100+"%";
if($("#expandZone").hasClass("active")){
$("#expandZone .expdiv").animate({marginLeft:m1Value});
}
else{
$("#expandZone .expdiv").css({marginLeft:m1Value});
$("#expandZone").animate({height:"130px"}).addClass("active");
}
$(this).addClass("btn-active").siblings().removeClass("btn-active");
return false;
});
$("#expandZone #closeBtn").on("click",function(){
$("#expandZone").animate({height:"0px"},function(){
$(this).removeClass("active");
$("#menuList .btn-active").removeClass("btn-active");
});
return false;
});
});
</script>
</head>
<body>
<div id="menuList" class="navlist">
<a href="#">首页</a>
<a href="#">课程大厅</a>
<a href="#">学习中心</a>
<a href="#">个人中心</a>
<a href="#">关于我们</a>
</div>
<div id="expandZone" class="expand">
<div class="expdiv">
<div class="expdiv-list">
<a href="#">慕课网主页</a>
</div>
<div class="expdiv-list">
<a href="#" id="A4">前端课程</a>
</div>
<div class="expdiv-list">
<a href="#">Javascript</a>
<a href="#">CSS</a>
<a href="#">JQuery</a>
</div>
<div class="expdiv-list">
个人信息：胡图图
</div>
<div class="expdiv-list">
公司地址：翻斗大街翻斗花园二号楼1001室
</div>
</div>
<div id="closeBtn" class="close-btn"></div>
</div>
</body>
</html>
