HTML

<ul class="menu ul">
    <li><h3 class="selected"><a href="https://jy.tp.yuanmeng.life/" class="depth_1">网站首页</a></h3></li>
    <li><h3><a href="https://jy.tp.yuanmeng.life/templates" class="depth_1">我的智慧小屋</a></h3></li>
    <li>
        <h3 id="menu_01"><a href="https://jy.tp.yuanmeng.life/" class="depth_1">设计素材</a></h3>
        <ul id="children_01" class="children">
            <li>
                <h3 id="menu_02c"><a href="https://jy.tp.yuanmeng.life/" class="depth_2"><span class="icon10"></span>PSD分层</a></h3>
                <ul id="children_02c">
                    <li><a href="https://jy.tp.yuanmeng.life/" class="depth_3">其他</a></li>
                </ul>
            </li>
        </ul>			
    </li>
    <li><h3><a href="https://jy.tp.yuanmeng.life/" class="depth_1">原创作品</a></h3></li>
    <li><h3><a href="https://jy.tp.yuanmeng.life/js" class="depth_1">网页特效</a></h3></li>
    <li><h3><a href="https://jy.tp.yuanmeng.life/topic" class="depth_1">设计趋势</a></h3></li>
</ul>

jQuery

$(function() {
    var navstr = '';
    for (c in vars = '0'.split(',')) {
        $('#menu_' + vars[c]).addClass('selected');
    }
    $('#wrap-nav ul.menu > li').hover(function() {
        $(this).find('.children').show();
        if ($(this).find('.children').length) $(this).addClass('hover');
    },
    function() {
        $('.children').hide();
        $(this).removeClass('hover');
    });
    $('#wrap-nav ul.menu h3, #wrap-nav ul.menu ul.children > li, #wrap-cats h3').hover(function() {
        $(this).addClass('hover');
    },
    function() {
        $(this).removeClass('hover');
    });
});