圆周运动的css3特效案例

<!doctype html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <title>圆周运动的css3特效</title>
    <style>
        .box{
            width:300px;
            height:300px;
            margin:200px auto;
            position:relative;
            -webkit-perspective:1500px;
        }
        .div{
            width:300px;
            height:300px;
            position:absolute;
            transform-style:preserve-3d;
            animation:name 8s linear infinite;
            transform:rotateX(0deg) rotateY(0deg);
        }
        @-webkit-keyframes name {
            from{
                transform:rotateX(0deg) rotateY(0deg);
            }
            to{
                transform:rotateX(360deg) rotateY(360deg);
            }
        }
        .div>div{
            width:300px;
            height:300px;
            border:black 1px solid;
            position:absolute;
            border-radius:50%;
        }
        .box1{
            transform:rotateY(0deg);
        }
        .box2{
            transform:rotateY(120deg);
        }
        .box3{
            transform:rotateY(240deg);
        }
        .inner{
            width:6px;
            height:6px;
            position:absolute;
            top:300px;
            left:150px;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="div">
            <div class="box1"></div>
            <div class="box2"></div>
            <div class="box3"></div>
        </div>
    </div>
</body>
</html>
<script>
    var box1=document.querySelector(".box1");
    var box2=document.querySelector(".box2");
    var box3=document.querySelector(".box3");
    function create(a){
        for(var i=0;i<100;i++){
            var div=document.createElement("div");
            div.className="inner";
            a.appendChild(div)
        }
    }
    create(box1)
    create(box2)
    create(box3)
    function an(b){
        var inner=b.querySelectorAll(".inner");
        var i=0;   //角度
        var j=0;   //元素下标
        var pi=Math.PI/180;
        var t=null;
        t=setInterval(function(){
            i++;   
            if(i>=360){
                i=0;
            }
            if(j>=100){
                j=0;
            }
            inner[j].style.background="rgb("+Math.floor(Math.random()*225)+","+Math.floor(Math.random()*225)+","+Math.floor(Math.random()*225)+")";
            inner[j].style.left=150+Math.floor(150*Math.sin(i*pi))-3+"px";
            inner[j].style.top=150-Math.floor(150*Math.cos(i*pi))-3+"px";
            j++;
        },10)
    }
    an(box1);
    an(box2);
    an(box3);
</script>
圆周运动的css3特效案例

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