css大会站点顶部的一个特效

看到http://css.w3ctech.com/ 上一个效果认为挺赞的。

然后学些了一下。

demo地址：http://codepen.io/tianzi77/pen/mJaLWq

html结构非常easy，就是一个p，2个span标签嵌套在a标签里面。

    <a href="/" class="link-mallki">
            思君子兮未敢言 zhuangjia
            <span data-letters="思君子兮未敢言 zhuangjia"></span>
            <span data-letters="思君子兮未敢言 zhuangjia"></span>
          </a>

样式有点复杂，整体是利用动画，伪类hover前后的样式进行变化出现炫酷的效果：

        body {
            background: black;
        }

        a {
            display: inline-block;
            font-size: 60px;
            margin: 30px 0 20px;
        }

        [class*="link-"] {
            outline: none;
            text-decoration: none;
            position: relative;
            line-height: 1;
            display: inline-block;
        }

        .link-mallki {
            color:#fff;
            -webkit-transition: color 0.5s 0.25s;
            transition: color 0.5s 0.25s;
            overflow: hidden;
        }

        .link-mallki:hover {
            -webkit-transition: none;
            transition: none;
            color: transparent;
        }

        .link-mallki::before {
            content: '';
            width: 100%;
            height: 2px;
            margin: -3px 0 0 0;
            background: #fff;
            position: absolute;
            left: 0;
            top: 50%;
            -webkit-transform: translate3d(-100%, 0, 0);
            transform: translate3d(-100%, 0, 0);
            -webkit-transition: -webkit-transform 0.4s;
            transition: transform 0.4s;
            -webkit-transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
            transition-timing-function: cubic-bezier(0.7, 0, 0.3, 1);
        }

        .link-mallki:hover::before {
            -webkit-transform: translate3d(100%, 0, 0);
            transform: translate3d(100%, 0, 0);
        }

        .link-mallki span {
            position: absolute;
            height: 50%;
            width: 100%;
            left: 0;
            top: 0;
            overflow: hidden;
        }

        .link-mallki span::before {
            content: attr(data-letters);
            position: absolute;
            left: 0;
            width: 100%;
            color: #abcdef;
            -webkit-transition: -webkit-transform 0.5s;
            transition: transform 0.5s;
        }

        .link-mallki span:nth-child(2) {
            top: 50%;
        }

        .link-mallki span:first-child::before {
            top: 0;
            -webkit-transform: translate3d(0, 100%, 0);
            transform: translate3d(0, 100%, 0);
        }

        .link-mallki span:nth-child(2)::before {
            bottom: 0;
            -webkit-transform: translate3d(0, -100%, 0);
            transform: translate3d(0, -100%, 0);
        }

        .link-mallki:hover span::before {
            -webkit-transition-delay: 0.3s;
            transition-delay: 0.3s;
            -webkit-transform: translate3d(0, 0, 0);
            transform: translate3d(0, 0, 0);
            -webkit-transition-timing-function: cubic-bezier(0.2, 1, 0.3, 1);
            transition-timing-function: cubic-bezier(0.2, 1, 0.3, 1);
        }