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js实现五彩斑斓的效果~

来源：榕意旅游网
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        *{
            margin: 0;
            padding: 0;
            list-style: none;
        }

        body{
            background-color: #000;
            overflow: hidden;
        }

        span{
            width: 30px;
            height: 30px;
            border-radius: 50%;
            position: absolute;
            background-size:100% 100%;
            animation: flash 1s alternate infinite;
        }

        @keyframes flash {
            0%{opacity: 0;}
            100%{opacity: 1;}
        }

        span:hover{
            animation:none;
        }
    </style>
</head>
<body>
<span></span>
<script>
    window.onload = function () {
        // 屏幕的尺寸
        var screenW = document.documentElement.clientWidth;
        var screenH = document.documentElement.clientHeight;

        //动态创建多个圆
        for(var i=0; i<150; i++){
            var span = document.createElement('span');
            document.body.appendChild(span);

            //位置随机
            var x = parseInt(Math.random() * screenW);
            var y = parseInt(Math.random() * screenH);
            span.style.left = x + 'px';
            span.style.top = y + 'px';

            //大小随机
            var scale = Math.random() * 1.5;
            span.style.transform = 'scale('+ scale + ', ' + scale + ')';

            //频率随机
            var rate = Math.random() * 1.5;
            span.style.animationDelay = rate + 's';

            //颜色随机
            var color = '#'+Math.floor(Math.random()*16777215).toString(16);
            span.style.background = color;
        }
    }
</script>
</body>
</html>
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