web前端利用jq实现折叠菜单

实现效果图：
功能：点击某一个一级菜单时，相应的二级菜单会下拉出现
实现代码：
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>According</title>
    <style>
        * {
            margin: 0px;
            padding: 0;
        }
        .nav{
            list-style: none;
            width: 300px;
            margin: 100px auto;
            background: #ffb2a7;
        }
        .nav>li{
            border: 1px solid #000000;
            line-height: 35px;
            border-bottom: none;
            position:relative;
            text-align: center;
        }
        .nav>li:last-child{
            border-bottom: 1px solid #000000;
            border-bottom-right-radius: 10px;
            border-bottom-left-radius: 10px;
        }
        .nav>li:first-child{
            border-top-right-radius: 10px;
            border-top-left-radius: 10px;
        }
        .nav>li>ul{
            list-style: none;
            background: #f8615a;
            display: none;
        }
        .nav>li>ul>li{
            border-top: 1px solid #ffb2a7;
            line-height: 35px;
        }
        .nav>li>ul>li:hover{
            background: #b80d57;
        }
        .nav>li>span{
            background:url("./img/下拉前.png") no-repeat center center;
           display: inline-block;
            width: 32px;
            height: 32px;
            position:absolute;
            right: 10px;
            top: 5px;
        }
    </style >
    <script src="./lib/jquery-1.11.3/jquery-1.11.3/jquery.min.js"></script>
        <script>
            $(function(){
                $(".nav>li").click(function(){
                    var $sub =$(this).children(".sub");
                    $sub.slideDown(1000);
                    var otherSub=$(this).siblings().children(".sub");
                    otherSub.slideUp(1000);
                })
            });
            </script>
</head>
<body>
    <ul class="nav">
        <li>一级菜单一
            <ul class="sub">
                <li>二级菜单</li>
                <li>二级菜单</li>
            </ul>
        </li>
        <li>一级菜单二
            <ul  class="sub">
                <li>二级菜单</li>
                <li>二级菜单</li>
            </ul>
        </li>
        <li>一级菜单三
            <ul  class="sub">
                <li>二级菜单</li>
                <li>二级菜单</li>
            </ul>
        </li>
        <li>一级菜单四
            <ul  class="sub">
                <li>二级菜单</li>
                <li>二级菜单</li>
            </ul>
        </li>
    </ul>
</body>
</html>
web前端利用jq实现折叠菜单

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