1，首先需要用的是 CSS3的 target 选择器，配合a标签指定id选择器切换目标元素，用于选取当前活动的目标元素。
2，CSS3 的 transition 动画，这里不做详细介绍

看一下效果图：

点击滑出按钮，元素从底部匀速滑入到页面一定高度；再点击滑入，元素从当前位置匀速滑入期初位置。

直接上代码：

<h1>CSS3滑入/滑出效果</h1><div id="volet_clos">    <div id="volet">        <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Minima quisquam tempora quaerat dolores molestias reiciendis .</p>        <p>vero labore voluptates necessitatibus ut? Et</p>        <p>vero labore voluptates necessitatibus ut? Et</p>        <p>vero labore voluptates necessitatibus ut? Et</p>        <p>vero labore voluptates necessitatibus ut? Et</p>        <a href="#volet"  aria-hidden="true" class="ouvrir">滑出</a>        <a href="#volet_clos" aria-hidden="true" class="fermer">滑入</a>    </div></div>

 <style>        #volet_clos {position: fixed;top: 0px; left: 0;width: 100%;}        #volet {width: 250px;padding: 10px;background: #6B9A49; color: #fff;width: 100%;}        /* 初始定位 */        #volet {position: absolute;left: 0px;top: 375px;transition: all .5s ease-in;}           #volet a.ouvrir,#volet a.fermer {position: absolute;right: -88px;top: 150px;}        /* 点击过后改变 target  */        #volet a.fermer {display: none;}        #volet:target {left: 0px;top: 150px;}        #volet:target a.fermer {display: block;}        #volet:target a.ouvrir {display: none;}        #volet_clos:target #volet {left: 0px;top: 375px;}        #volet a.ouvrir,#volet a.fermer{position: absolute;right: calc(40%);top: -40px;padding: 10px 25px; background: #555; color: #fff; text-decoration: none;text-align: center; width: 120px;}    </style>

案例二，tab标签页切换效果

<h1>tab标签页切换效果</h1><div class="swiper-box">    <div class="swiper-cont">        <div class="swiper1" id="swiper1"></div>        <div class="swiper2" id="swiper2"></div>        <div class="swiper3" id="swiper3"></div>    </div>    <div class="swiper-num">        <a href="#swiper1">1</a>        <a href="#swiper2">2</a>        <a href="#swiper3">3</a>    </div></div>

/* tab标签页切换效果 css */.swiper-box{position: relative;width: 500px; height: 300px; margin: 20px auto; background: #f1f1f1;}.swiper-cont div,.swiper1,.swiper2,.swiper3{ width: 0%; height: 300px;position: absolute;top: 0; left: 0;transition: width .5s linear;}.swiper1{background: linear-gradient(to top, #fba555, #ffed6c 75%);}.swiper2{background: linear-gradient(to left, #55d5fb, #fd74a7 75%);}.swiper3{background: linear-gradient(to top left, #55fb69, #6cfff1  75%);}.swiper-num{position: absolute; bottom: 0;right: 0;display: inline-block;z-index: 9;}.swiper-num a{display: inline-block;margin-left: 10px;padding: 10px 20px; color: #333;font-size: 14px; text-decoration: none;font-weight: bold;background: rgba(255,255,255,.45);}.swiper-num a:hover,.swiper-num a:active{ color: red;cursor: pointer;background: rgba(255,255,255,.95);}.swiper-box :target{width: 100%;transition: width .5s linear;}

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