练习题看它答案为什么还是有bug，就是我点击首页，再点击首页二级框就会消失为什么？？？
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style type="text/css">
.navlist
{
position: absolute;
top: 10px;
}
a
{
text-decoration: none;
color: White;
}
.navlist a
{
margin-left: 60px;
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(http://img1.sycdn.imooc.com//5461ba3b0001ee3603840154.jpg) no-repeat -13px -117px;
position: absolute;
left: 50%;
bottom: -2px;
margin-left: -60px;
cursor: pointer;
}
</style>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$("#menuList").on("click", "a", function () {
// 模拟点击closeBtn按钮
if ($(this).hasClass("btn-active")) {
$("#expandZone #closeBtn").click();
return false;
}
var curIndex = $(this).index(), mlValue = "-" + curIndex * 100 + "%";
if ($("#expandZone").hasClass("active")) {
// 给expdiv类元素赋予动画切换的效果
$("#expandZone .expdiv").animate({ marginLeft: mlValue });
}
else {
$("#expandZone .expdiv").css({ marginLeft: mlValue });
$("#expandZone").animate({ height: "130px" }).addClass("active");
}
// 为当前元素添加"btn-active"样式，同时移除同级其它元素的"btn-active"样式
$(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> <a href="#">手机开发</a> <a href="#">后台编程</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：
</div>
<div class="expdiv-list">
公司地址：北京市西城区德外大街10号
</div>
</div>
<div id="closeBtn" class="close-btn">
</div>
</div>
</body>
</html>
