纯CSS3实现移动端展开和收起效果的示例代码

<section class="block">
    <input type="checkbox">
    <div class="case-block">
      <div>展开</div>
      <div>收起</div>
    </div>
    <div class="detail">
      <div>唧唧复唧唧，木兰当户织。不闻机杼声，惟闻女叹息。(惟闻 通唯)问女何所思，问女何所忆。女亦无所思，女亦无所忆。昨夜见军帖，可汗大点兵，军书十二卷，卷卷有爷名。阿爷无大儿，木兰无长兄，愿为市鞍马，从此替爷征。(惟闻
        通唯)</div>
      <div>东市买骏马，西市买鞍鞯，南市买辔头，北市买长鞭。旦辞爷娘去，暮宿黄河边，不闻爷娘唤女声，但闻黄河流水鸣溅溅。旦辞黄河去，暮至黑山头，不闻爷娘唤女声，但闻燕山胡骑鸣啾啾。</div>
      <div>万里赴戎机，关山度若飞。朔气传金柝，寒光照铁衣。将军百战死，壮士十年归。</div>
      <div>归来见天子，天子坐明堂。策勋十二转，赏赐百千强。可汗问所欲，木兰不用尚书郎，愿驰千里足，送儿还故乡。(一作愿借明驼千里足)</div>
      <div>爷娘闻女来，出郭相扶将；阿姊闻妹来，当户理红妆；小弟闻姊来，磨刀霍霍向猪羊。开我东阁门，坐我西阁床，脱我战时袍，著我旧时裳。当窗理云鬓，对镜帖花黄。出门看火伴，火伴皆惊忙同行十二年，不知木兰是女郎。（帖
      通贴；惊忙一作惶；惶 火伴 通伙）</div>
     <div>雄兔脚扑朔，雌兔眼迷离；双兔傍地走，安能辨我是雄雌？</div>
    </div>
  </section>

@charset "UTF-8";

.title-block {
    height: 26px;
    text-align: center;
}

.block {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: reverse;
    -ms-flex-flow: column-reverse nowrap;
    flex-flow: column-reverse nowrap;
    width: 360px;
    margin: 0 auto;
    font-size: 14px;
    color: #4C4C4C;
    line-height: 28px;
    border: 1px solid #999;
    padding: 10px;
}

.block > .detail {
    max-height: 163px;
    margin-bottom: 10px;
    overflow: hidden;
}

.block > .case-block {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    width: 120px;
    height: 24px;
    margin: 0 auto 0;
    color: #0e0e0e;
    background: #fff;
    border: 1px solid #0e0e0e;
    border-radius: 5px;
}

.block > .case-block div:nth-of-type(1) {
    display: block;
}

.block > .case-block div:nth-of-type(2) {
    display: none;
}

.block > [type="checkbox"] {
    position: relative;
    display: block;
    width: 120px;
    height: 24px;
    margin: -24px auto 0;
    z-index: 1000;
    opacity: 0;
}

.block > [type="checkbox"]:hover + .case-block {
    background-color: #f5f5f5;
}

.block > [type="checkbox"]:checked + .case-block div:nth-of-type(1) {
    display: none;
}

.block > [type="checkbox"]:checked + .case-block div:nth-of-type(2) {
    display: block;
}

.block > [type="checkbox"]:checked + .case-block + .detail {
    max-height: inherit;
}