button 按钮点击波动效果-蒲公英云

button 按钮点击波动效果

<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<title></title>
<style>
.center{text-align:center}
h1.mt40{margin-top:40px}
.btn {background:#4285f4;position:relative;width:13em;height:3em;margin:2em;border:none;outline:none;letter-spacing:.2em;font-weight:bold;background:#999;cursor:pointer;overflow:hidden;user-select:none;border-radius:2px;color:#fff;}
.ripple {position:absolute;background:rgba(0,0,0,.15);border-radius:100%;transform:scale(0);pointer-events:none;}
.ripple.show {animation:ripple .75s ease-out;}
@keyframes ripple {to {transform:scale(2);opacity:0;}}
</style>
</head>
<body>
<h1 class="center mt40"></h1>
<div class="main center">
    <button class="btn">BUTTON</button>
</div>
<script>
var addRippleEffect = function (e) {
    var target = e.target;
    if (target.className.toLowerCase() !== 'btn') return false;
    var rect = target.getBoundingClientRect();
    var ripple = target.querySelector('.ripple');
    if (!ripple) {
        ripple = document.createElement('span');
        ripple.className = 'ripple';
        ripple.style.height = ripple.style.width = Math.max(rect.width, rect.height) + 'px';
        target.appendChild(ripple);
    }
    ripple.classList.remove('show');
    var top = e.pageY - rect.top - ripple.offsetHeight / 2 - document.body.scrollTop;
    var left = e.pageX - rect.left - ripple.offsetWidth / 2 - document.body.scrollLeft;
    ripple.style.top = top + 'px';
    ripple.style.left = left + 'px';
    ripple.classList.add('show');
    return false;
}
document.addEventListener('click', addRippleEffect, false);
</script>
    <!-- 无关紧要的-->
    <script src="/js/other.js"></script>
    <link href="/css/other.css" rel="stylesheet" />
    <script src="http://code.jquery.com/jquery-2.1.1.min.js"></script> 
    <script src="/js/pop_250_250.js"></script>
</body>
</html>