主题移动端，样式下添加二级分类

1. 代码

修改header.php 相关j-sidebar-xs中的部分，主要是替换下面这一部分

    <div class="card">
        <div class="title">类目归类</div>
        <ul class="category-nav">
            <?php while ($categorys->next()) : ?>
                <?php $children = $categorys->getAllChildren($categorys->mid); ?>
                <?php if ($categorys->levels === 0): ?>
                    <?php if (empty($children)): ?>
                        <li class='<?php if ($this->is('category', $categorys->slug)) _e("active"); ?>'>
                            <svg viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg">
                                <path d="M325.31499999 764.323l1e-8-508.83099999c0-28.16 22.598-50.934 50.757-50.93400001 13.09300001 0 24.932 5.024 33.901 13.092l335.755 251.633c22.24 16.859 26.905 48.607 10.044 71.024-2.87099999 3.947-6.281 7.355-10.045 10.045l-339.338 254.51c-22.241 16.676-54.16 12.193-70.844-10.225-6.996-9.15-10.225-19.73-10.225-30.31v0z" p-id="6117"></path>
                            </svg>
                            <a href="<?php $categorys->permalink(); ?>"><?php $categorys->name(); ?></a>
                        </li>
                    <?php else: ?>
                        <li class='<?php if ($this->is('category', $categorys->slug)) _e("active"); ?>'>
                            <svg viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg">
                                <path d="M325.31499999 764.323l1e-8-508.83099999c0-28.16 22.598-50.934 50.757-50.93400001 13.09300001 0 24.932 5.024 33.901 13.092l335.755 251.633c22.24 16.859 26.905 48.607 10.044 71.024-2.87099999 3.947-6.281 7.355-10.045 10.045l-339.338 254.51c-22.241 16.676-54.16 12.193-70.844-10.225-6.996-9.15-10.225-19.73-10.225-30.31v0z" p-id="6117"></path>
                            </svg>
                            <a href="<?php $categorys->permalink(); ?>"><?php $categorys->name(); ?>
                                <span><i class="icon iconfont icon-Chevronrighticon text-right"></i><i class="icon iconfont icon-Chevrondownicon text-down"></i></span>
                            </a>
                            <ul>
                                <?php foreach ($children as $mid):?>
                                    <?php $child = $categorys->getCategory($mid); ?>
                                    <li <?php if($this->is('category', $child['slug'])): ?> class="active"<?php endif; ?>>
                                        <a href="<?php echo $child['permalink'] ?>" title="<?php echo $child['name']; ?>"><?php echo $child['name']; ?></a>
                                    </li>
                                <?php endforeach; ?>
                            </ul>
                        </li>
                    <?php endif; ?>
                <?php endif; ?>
            <?php endwhile; ?>
        </ul>
    </div>

2. 添加js 控制

    $('.j-sidebar-xs .item.category ul li a').unbind().bind('click',function (ev) {
                    let c = $(this);
                    c.parent().siblings(".active").toggleClass("active")
                    if(c.next().is("ul") && c.parent().toggleClass("active") && ev.preventDefault()) return false;
                })

3. 添加css

    .item.category{
    ul.category-nav li ul{
        display: none;
        padding-left: 2.5em;
        opacity: 0;
        height: 0;
        overflow: auto;
        -webkit-transition: all .2s ease-in-out 0s;
        transition: all .2s ease-in-out 0s;
        li:last-child{
            border-bottom: none;
        }
    }
    ul.category-nav li a {
        span{
            float: right;
        }
        .text-down{
            display: none;
        }
    }

    ul.category-nav li.active {
        ul {
            display: block;
            opacity: 1;
            height: auto;
        }
        a .text-right{
            display: none;
        }
        a .text-down{
            display: block;
        }
    }
    }
    .j-sidebar-xs .content .item .card ul li {
        display: block; <!--将原来的flex改为block-->
    }