径向动画菜单

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>径向动画菜单</title>
    <style type="text/css">
        h1,div,nav,a {
            padding:0;
            margin: 0;
        }
        body {
            background: yellow; 
        }
        div.nav-wrap {
            position: relative;
            margin: 0 auto;
            margin-top: 30px;
            height: 300px;
             300px;
            border-radius: 150px; 
            border: 1px dotted red;
        }
        nav{
            position: absolute;
            /*top: 50%;
            left: 50%;*/
             100%;
            height: 100%;
            opacity: 0;
            transform:scale(0);
            transition: all 2s ease;
            background: #999 

        }
        .toggle {
            transform: scale(1);
            opacity: 1;
        }
        .nav-wrap>a.main-nav{
            display: inline-block;
            padding: 5px 10px;
            position: absolute;
            top: 50%;
            left: 50%;
            /*transform: scale(0);*/
            transform: translate(-50%,-50%);
            background: blue;
            color: #fff;
        }
        .nav-wrap>a.main-nav:active {
            background: green;
        }
        nav>a {
            position: absolute;
             30px;
            height: 30px;
            background-color: #008fd4;
            top: 50%;
            left: 50%;
            transform: translate(-50%,-50%);
            transition: all 2s
        }
    </style>
</head>
<body>
    <h1>径向动画菜单效果分步演示</h1>

    <div class="nav-wrap">
        <nav class="">
            <a class="nav-item">1</a>
            <a class="nav-item">2</a>
            <a class="nav-item">3</a>
            <a class="nav-item">4</a>
            <a class="nav-item">5</a>
            <a class="nav-item">6</a>
            <a class="nav-item">7</a>
            <a class="nav-item">8</a>
            <a class="nav-item">5</a>
            <a class="nav-item">6</a>
            <a class="nav-item">7</a>
            <a class="nav-item">8</a>
        </nav>
        <a class="main-nav">点我</a>
    </div>
    
</body>
<script src="http://s0.qhimg.com/lib/jquery/183.js" ></script>
<script type="text/javascript">
function  nav(){
    var angleStart=0, angleEnd=360, n=$('nav>a').length;
    console.log($('nav>a'));
    var  intervals= Math.PI/180;
    var  min = 360/n;
    $('nav>a').each(function(index,name){
        console.log(index,name);
        var Wh= $('nav').width()/2;
        var Ht= $('nav').height()/2;
        var h=Wh-15;
        var t=Ht-15;
        console.log(Wh,Ht);
        name.style.top=(h+ Wh*Math.sin(min*index*intervals))+ "px";
        name.style.left=(t + Ht*Math.cos(min*index*intervals)+15)+ "px";
        console.log(name.style.top=(Wh + Wh*Math.sin(min*index*intervals))+"px")
    })

}
nav();
var  fs=true;
$('.main-nav').click(function(){
    $("nav").toggleClass('toggle');
    fs=!fs;
    if(fs) {
        $("nav>a").css({
             "30px",
            height: "30px",
            top: "50%",
            left: "50%"
        })
    }else{
        nav()
    }
});
</script>
</html>
“我相当乐意花一天的时间通过编程把一个任务实现自动化，除非这个任务手动只需要10秒钟就能完成”