纯CSS3炫酷圆形导航菜单特效

这是一款效果非常炫酷的纯CSS3炫酷圆形导航菜单特效。该圆形菜单在鼠标hover主菜单时，所有的子菜单会依次出现，并以动画的方式环绕在圆形主菜单周围。

使用方法

该圆形菜单特效使用bootstrap的网格系统进行布局，并使用了Fontawesome字体图标。

<link href="path/to/css/bootstrap.min.css" rel="stylesheet">
<link href="path/to/css/font-awesome.min.css" rel="stylesheet">                  
                

HTML结构

该圆形菜单的HMLT结构如下：

<div class="container">
    <div class="row">
        <div class="col-md-12">
            <div class="navbar">主菜单
                <ul class="menu">
                    <li><a href="#" class="fa fa-facebook"></a></li>
                    <li><a href="#" class="fa fa-google-plus"></a></li>
                    <li><a href="#" class="fa fa-twitter"></a></li>
                    <li><a href="#" class="fa fa-linkedin"></a></li>
                    <li><a href="#" class="fa fa-pinterest"></a></li>
                    <li><a href="#" class="fa fa-rss"></a></li>
                    <li><a href="#" class="fa fa-instagram"></a></li>
                    <li><a href="#" class="fa fa-skype"></a></li>
                    <li><a href="#" class="fa fa-github"></a></li>
                </ul>
            </div>
        </div>
    </div>
</div>
                

CSS样式

为圆形菜单设置下面的CSS样式：

.navbar{
    width: 150px;
    height: 150px;
    line-height: 150px;
    border-radius: 50%;
    background: #fff;
    margin: 70px auto;
    position: relative;
    cursor: pointer;
    text-align: center;
    font-size: 1.75em;
    font-weight: bold;
    color: #99b977;
    transition: 0.24s 0.2s;
}
.navbar:hover{
    background: rgba(255, 255, 255, 0.75);
}
.navbar .menu{
    list-style: none;
    padding: 0;
    margin: 0;
    position: absolute;
    top: -75px;
    left: -75px;
    border: 150px solid transparent;
    cursor: default;
    border-radius: 50%;
    transform: scale(0);
    transition: transform 1.4s 0.07s;
    z-index: -1;
}
.navbar:hover .menu{
    transition: transform 0.4s 0.08s, z-index   0s  0.5s;
    transform: scale(1);
    z-index: 1;
}
.navbar .menu li{
    position: absolute;
    top: -100px;
    left: -100px;
    transform-origin: 100px 100px;
    transition: all 0.5s 0.1s;
}
.navbar:hover .menu li{
    transition: all 0.6s;
}
.navbar .menu li a{
    width: 45px;
    height: 45px;
    line-height: 45px;
    border-radius: 50%;
    background: #fff;
    position: absolute;
    font-size: 60%;
    color: #99b977;
    transition: 0.6s;
}
.navbar:hover .menu li:nth-child(1){
    transition-delay: 0.02s;
    transform: rotate(85deg);
}
.navbar:hover .menu li:nth-child(1) a{
    transition-delay: 0.04s;
    transform: rotate(635deg);
}
.navbar:hover .menu li:nth-child(2){
    transition-delay: 0.04s;
    transform: rotate(125deg);
}
.navbar:hover .menu li:nth-child(2) a{
    transition-delay: 0.08s;
    transform: rotate(595deg);
}
.navbar:hover .menu li:nth-child(3){
    transition-delay: 0.06s;
    transform: rotate(165deg);
}
.navbar:hover .menu li:nth-child(3) a{
    transition-delay: 0.12s;
    transform: rotate(555deg);
}
.navbar:hover .menu li:nth-child(4){
    transition-delay: 0.08s;
    transform: rotate(205deg);
}
.navbar:hover .menu li:nth-child(4) a{
    transition-delay: 0.16s;
    transform: rotate(515deg);
}
.navbar:hover .menu li:nth-child(5){
    transition-delay: 0.1s;
    transform: rotate(245deg);
}
.navbar:hover .menu li:nth-child(5) a{
    transition-delay: 0.2s;
    transform: rotate(475deg);
}
.navbar:hover .menu li:nth-child(6){
    transition-delay: 0.12s;
    transform: rotate(285deg);
}
.navbar:hover .menu li:nth-child(6) a{
    transition-delay: 0.24s;
    transform: rotate(435deg);
}
.navbar:hover .menu li:nth-child(7){
    transition-delay: 0.14s;
    transform: rotate(325deg);
}
.navbar:hover .menu li:nth-child(7) a{
    transition-delay: 0.28s;
    transform: rotate(395deg);
}
.navbar:hover .menu li:nth-child(8){
    transition-delay: 0.16s;
    transform: rotate(365deg);
}
.navbar:hover .menu li:nth-child(8) a{
    transition-delay: 0.32s;
    transform: rotate(355deg);
}
.navbar:hover .menu li:nth-child(9){
    transition-delay: 0.18s;
    transform: rotate(405deg);
}
.navbar:hover .menu li:nth-child(9) a{
    transition-delay: 0.36s;
    transform: rotate(315deg);
}