基于JS+Canves实现点击按钮水波纹效果

近来看到个不错的按钮点击效果，当点击时产生一次水波涟漪效果，挺好玩的，于是简单的实现了下（没考虑低版本浏览器兼容问题）
先看看效果吧，如下图（录制gif软件有点渣，看起来卡卡的...）

这种效果可以由元素内嵌套canves实现，也可以由css3实现。
Canves实现
网上摘了一份canves实现的代码，略微去掉了些重复定义的样式并且给出js注释，代码如下
html代码

<a class="btn color-1 material-design" data-color="#2f5398">Press me！</a>

css代码

* {box-sizing: border-box;outline: none;}body {font-family: "Open Sans";font-size: 100%;font-weight: 300;line-height: 1.5em;text-align: center;}.btn {border: none;display: inline-block;color: white;overflow: hidden;margin: 1rem;padding: 0;width: 150px;height: 40px;text-align: center;line-height: 40px;border-radius: 5px;}.btn.color-1 {background-color: #426fc5;}.btn-border.color-1 {background-color: transparent;border: 2px solid #426fc5;color: #426fc5;}.material-design {position: relative;}.material-design canvas {opacity: 0.25;position: absolute;top: 0;left: 0;}.container {align-content: center;align-items: flex-start;display: flex;flex-direction: row;flex-wrap: wrap;justify-content: center;margin: 0 auto;max-width: 46rem;}

js代码

var canvas = {},centerX = 0,centerY = 0,color = "",containers = document.getElementsByClassName（"material-design"）context = {},element = {},radius = 0,// 根据callback生成requestAnimationFrame动画requestAnimFrame = function （） {return （window.requestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function （callback） {window.setTimeout（callback, 1000 / 60）;}）;} （）,// 为每个指定元素生成canvesinit = function （） {containers = Array.prototype.slice.call（containers）;for （var i = 0; i < containers.length; i += 1） {canvas = document.createElement（"canvas"）;canvas.addEventListener（"click", press, false）;containers[i].appendChild（canvas）;canvas.style.width ="100%";canvas.style.height="100%";canvas.width = canvas.offsetWidth;canvas.height = canvas.offsetHeight;}},// 点击并且获取需要的数据，如点击坐标、元素大小、颜色press = function （event） {color = event.toElement.parentElement.dataset.color;element = event.toElement;context = element.getContext（"2d"）;radius = 0;centerX = event.offsetX;centerY = event.offsetY;context.clearRect（0, 0, element.width, element.height）;draw（）;},// 绘制圆形，并且执行动画draw = function （） {context.beginPath（）;context.arc（centerX, centerY, radius, 0, 2 * Math.PI, false）;context.fillStyle = color;context.fill（）;radius += 2;// 通过判断半径小于元素宽度，不断绘制 radius += 2 的圆形if （radius < element.width） {requestAnimFrame（draw）;}};init（）;

CSS3实现
接下来就是纯手打的代码了...觉得还是css3实现的方便些，可能是css写习惯了...
html代码

<a class="waves ts-btn">Press me！</a>

css代码

.waves{position:relative;cursor:pointer;display:inline-block;overflow:hidden;text-align: center;-webkit-tap-highlight-color:transparent;z-index:1;}.waves .waves-animation{position:absolute;border-radius:50%;width:25px;height:25px;opacity:0;background:rgba（255,255,255,0.3）;transition:all 0.7s ease-out;transition-property:transform, opacity, -webkit-transform;-webkit-transform:scale（0）;transform:scale（0）;pointer-events:none}.ts-btn{width: 200px;height: 56px;line-height: 56px;background: #f57035;color: #fff;border-radius: 5px;}

js代码

document.addEventListener（"DOMContentLoaded",function（）{var duration = 750;// 样式string拼凑var forStyle = function（position）{var cssStr = "";for（ var key in position）{if（position.hasOwnProperty（key）） cssStr += key+":"+position[key]+";";};return cssStr;}// 获取鼠标点击位置var forRect = function（target）{var position = {top:0,left:0}, ele = document.documentElement;"undefined" ！= typeof target.getBoundingClientRect && （position = target.getBoundingClientRect（））;return {top: position.top + window.pageYOffset - ele.clientTop,left: position.left + window.pageXOffset - ele.clientLeft}}var show = function（event）{var pDiv = event.target,cDiv = document.createElement（"div"）;pDiv.appendChild（cDiv）;var rectObj = forRect（pDiv）,_height = event.pageY - rectObj.top,_left = event.pageX - rectObj.left,_scale = "scale（" + pDiv.clientWidth / 100 * 10 + "）";var position = {top: _height+"px",left: _left+"px"};cDiv.className = cDiv.className + " waves-animation",cDiv.setAttribute（"style", forStyle（position））,position["-webkit-transform"] = _scale,position["-moz-transform"] = _scale,position["-ms-transform"] = _scale,position["-o-transform"] = _scale,position.transform = _scale,position.opacity = "1",position["-webkit-transition-duration"] = duration + "ms",position["-moz-transition-duration"] = duration + "ms",position["-o-transition-duration"] = duration + "ms",position["transition-duration"] = duration + "ms",position["-webkit-transition-timing-function"] = "cubic-bezier（0.250, 0.460, 0.450, 0.940）",position["-moz-transition-timing-function"] = "cubic-bezier（0.250, 0.460, 0.450, 0.940）",position["-o-transition-timing-function"] = "cubic-bezier（0.250, 0.460, 0.450, 0.940）",position["transition-timing-function"] = "cubic-bezier（0.250, 0.460, 0.450, 0.940）",cDiv.setAttribute（"style", forStyle（position））;var finishStyle = {opacity: 0,"-webkit-transition-duration": duration + "ms", // 过渡时间"-moz-transition-duration": duration + "ms","-o-transition-duration": duration + "ms","transition-duration": duration + "ms","-webkit-transform" : _scale,"-moz-transform" : _scale,"-ms-transform" : _scale,"-o-transform" : _scale,top: _height + "px",left: _left + "px",};setTimeout（function（）{cDiv.setAttribute（"style", forStyle（finishStyle））;setTimeout（function（）{pDiv.removeChild（cDiv）;},duration）;},100）}document.querySelector（".waves"）.addEventListener（"click",function（e）{show（e）;},！1）;},！1）;

好了，就这些，顺便，中秋快乐~