CSS旋转头像特效

发表于 更新于 分类于 Waline：

发一篇一年前写的CSS代码，纯CSS3做的旋转特效，比较简单，看一遍基本就会了。

解读

做这种旋转的关键是弄清楚CSS的元素层级概念，浏览器渲染元素是有规则的，如果有多个兄弟元素被绝对定位，那么后面的元素z-index就比前面的高，backface-visibility也是必须要掌握的，这个属性用的不多，往往在3D场景中才用到，作用是定义当元素不面向屏幕时是否可见，就是说在旋转元素时如果不希望看到其背面，这时候就可以使用它来隐藏。

CSS

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* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
html, body {
    height: 100%;
    width: 100%;
}
body {
    position: relative;
}
.container {
    position: absolute;
    width: 100%;
    height: 250px;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    display: flex;
    align-items: center;
    background: rgba(237, 209, 196, 0.6);
    border-radius: 50%;
}
.rotate-img-list {
    width: 100%;
    display: flex;
    flex-flow: row nowrap;
    justify-content: space-around;
    align-items: center;
}
.rotate-img-list > li {
    list-style: none;
    height: 120px;
    width: 120px;
    cursor: pointer;
    position: relative;
}
.rotate-img-list > li img {
    display: block;
    width: 100%;
    height: auto;
    max-width: 100%;
}
.rotate-img-list > li .front,
.rotate-img-list > li .back {
    position: absolute;
    left: 0;
    top: 0;
    height: 120px;
    width: 120px;
    overflow: hidden;
    border-radius: 50%;
    border: solid 3px #5ddea9;
    box-shadow: 0 3px 10px #999;
    transition: all 400ms ease-in;
    transform-style: preserve-3d;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    /* 定义当元素不面向屏幕时不可见 */
}
.rotate-img-list .front {
    transform: rotateY(0deg);
    z-index: 2;
}
.rotate-img-list .back {
    transform: rotateY(180deg);
    z-index: 1;
}
.rotate-img-list .cover {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    /* 不需设置z-index，后面的元素默认层级比前面的高 */
    background-color: #000;
    border-radius: 50%;
    opacity: .65;
    pointer-events: none;
}
.rotate-img-list .stars-info {
    position: absolute;
    top: 0;
    width: 114px;
    height: 114px;
    line-height: 22px;
    padding-top: 45px;
    text-align: center;
    color: #fff;
    background: transparent;
    border-radius: 50%;
}

/* 转到背面,并调整元素层级 */
.rotate-img-list li:hover .front {
    transform: rotateY(180deg);
    z-index: 1;
}
/* 转到正面,并调整元素层级 */
.rotate-img-list li:hover .back {
    transform: rotateY(0deg);
    z-index: 2;
}

HTML

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<div class="container">
    <ul class="rotate-img-list">
        <li>
            <div class="front"><img src="images/t1.png" /></div>
            <div class="back">
                <img src="images/t1.png" />
                <div class="cover"></div>
                <div class="stars-info">
                    Backface
                </div>
            </div>
        </li>
        <li>
            <div class="front"><img src="images/t2.png" /></div>
            <div class="back">
                <img src="images/t2.png" />
                <div class="cover"></div>
                <div class="stars-info">
                    Backface
                </div>
            </div>
        </li>
        <li>
            <div class="front"><img src="images/t3.jpg" /></div>
            <div class="back">
                <img src="images/t3.jpg" />
                <div class="cover"></div>
                <div class="stars-info">
                    Backface
                </div>
            </div>
        </li>
    </ul>
</div>