非常酷的CSS3垂直下拉动画菜单

昨天我向大家介绍了一款兼容性不错的jQuery淡入淡出下拉菜单，今天要分享一款相对绚丽的CSS3垂直下拉动画菜单，不过需要支持CSS3的浏览器才能有效果。下面是效果图，一起看看。

我们也可以在这里查看菜单DEMO演示。

下面来分析一下源代码，首先是HTML代码：

<nav>
        <ul class="mcd-menu">
            <li>
                <a href="">
                    <i class="fa fa-home"></i>
                    <strong>Home</strong>
                    <small>sweet home</small>
                </a>
            </li>
            <li>
                <a href="" class="active">
                    <i class="fa fa-edit"></i>
                    <strong>About us</strong>
                    <small>sweet home</small>
                </a>
            </li>
            <li>
                <a href="">
                    <i class="fa fa-gift"></i>
                    <strong>Features</strong>
                    <small>sweet home</small>
                </a>
            </li>
            <li>
                <a href="">
                    <i class="fa fa-globe"></i>
                    <strong>News</strong>
                    <small>sweet home</small>
                </a>
            </li>
            <li>
                <a href="">
                    <i class="fa fa-comments-o"></i>
                    <strong>Blog</strong>
                    <small>what they say</small>
                </a>
                <ul>
                    <li><a href="#"><i class="fa fa-globe"></i>Mission</a></li>
                    <li>
                        <a href="#"><i class="fa fa-group"></i>Our Team</a>
                        <ul>
                            <li><a href="#"><i class="fa fa-female"></i>Leyla Sparks</a></li>
                            <li>
                                <a href="#"><i class="fa fa-male"></i>Gleb Ismailov</a>
                                <ul>
                                    <li><a href="#"><i class="fa fa-leaf"></i>About</a></li>
                                    <li><a href="#"><i class="fa fa-tasks"></i>Skills</a></li>
                                </ul>
                            </li>
                            <li><a href="#"><i class="fa fa-female"></i>Viktoria Gibbers</a></li>
                        </ul>
                    </li>
                    <li><a href="#"><i class="fa fa-trophy"></i>Rewards</a></li>
                    <li><a href="#"><i class="fa fa-certificate"></i>Certificates</a></li>
                </ul>
            </li>
            <li>
                <a href="">
                    <i class="fa fa-picture-o"></i>
                    <strong>Portfolio</strong>
                    <small>sweet home</small>
                </a>
            </li>
            <li>
                <a href="">
                    <i class="fa fa-envelope-o"></i>
                    <strong>Contacts</strong>
                    <small>drop a line</small>
                </a>
            </li>
            <li class="float">
                <a class="search">
                    <input type="text" value="search ...">
                    <button><i class="fa fa-search"></i></button>
                </a>
                <a href="" class="search-mobile">
                    <i class="fa fa-search"></i>
                </a>
            </li>
        </ul>
    </nav>

这里用ul构造了菜单的基本结构。

接下来就利用CSS3代码来实现菜单的下拉和动画效果。

CSS代码比较繁琐，这里我只是提供一些核心的CSS代码，完整的代码大家可以在文章最后下载学习。

这是鼠标滑过菜单项时的动画代码：

.mcd-menu li a i, .mcd-menu li a strong, .mcd-menu li a small {
  position: relative;
  
  transition: all 300ms linear;
  -o-transition: all 300ms linear;
  -ms-transition: all 300ms linear;
  -moz-transition: all 300ms linear;
  -webkit-transition: all 300ms linear;
}
.mcd-menu li:hover > a i {
    opacity: 1;
    -webkit-animation: moveFromTop 300ms ease-in-out;
    -moz-animation: moveFromTop 300ms ease-in-out;
    -ms-animation: moveFromTop 300ms ease-in-out;
    -o-animation: moveFromTop 300ms ease-in-out;
    animation: moveFromTop 300ms ease-in-out;
}
.mcd-menu li:hover a strong {
    opacity: 1;
    -webkit-animation: moveFromLeft 300ms ease-in-out;
    -moz-animation: moveFromLeft 300ms ease-in-out;
    -ms-animation: moveFromLeft 300ms ease-in-out;
    -o-animation: moveFromLeft 300ms ease-in-out;
    animation: moveFromLeft 300ms ease-in-out;
}
.mcd-menu li:hover a small {
    opacity: 1;
    -webkit-animation: moveFromRight 300ms ease-in-out;
    -moz-animation: moveFromRight 300ms ease-in-out;
    -ms-animation: moveFromRight 300ms ease-in-out;
    -o-animation: moveFromRight 300ms ease-in-out;
    animation: moveFromRight 300ms ease-in-out;
}

.mcd-menu li:hover > a {
  color: #e67e22;
}

以下定义了鼠标滑过后文字图标滑过的动画，分别是从顶部划入，从左侧划入，从右侧划入：

@-webkit-keyframes moveFromTop {
    from {
        opacity: 0;
        -webkit-transform: translateY(200%);
        -moz-transform: translateY(200%);
        -ms-transform: translateY(200%);
        -o-transform: translateY(200%);
        transform: translateY(200%);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0%);
        -moz-transform: translateY(0%);
        -ms-transform: translateY(0%);
        -o-transform: translateY(0%);
        transform: translateY(0%);
    }
}
@-webkit-keyframes moveFromLeft {
    from {
        opacity: 0;
        -webkit-transform: translateX(200%);
        -moz-transform: translateX(200%);
        -ms-transform: translateX(200%);
        -o-transform: translateX(200%);
        transform: translateX(200%);
    }
    to {
        opacity: 1;
        -webkit-transform: translateX(0%);
        -moz-transform: translateX(0%);
        -ms-transform: translateX(0%);
        -o-transform: translateX(0%);
        transform: translateX(0%);
    }
}
@-webkit-keyframes moveFromRight {
    from {
        opacity: 0;
        -webkit-transform: translateX(-200%);
        -moz-transform: translateX(-200%);
        -ms-transform: translateX(-200%);
        -o-transform: translateX(-200%);
        transform: translateX(-200%);
    }
    to {
        opacity: 1;
        -webkit-transform: translateX(0%);
        -moz-transform: translateX(0%);
        -ms-transform: translateX(0%);
        -o-transform: translateX(0%);
        transform: translateX(0%);
    }
}

最后，把源代码分享一下，下载地址>>