分享一段代码实例，它利用svg实现了点击生成动态放大的圆效果。
代码实例如下:
<!doctype html> <html> <head> <meta charset="utf-8"> <meta name="author" content="http://www.softwhy.com/" /> <title>蚂蚁部落</title> </head> <body> <svg id="svg" width="500px" height="500px" style="background-color: #f2f2f2"></svg> <script> var svg = document.getElementById("svg"); svg.onclick = function(event) { var circle = document.createElementNS("http://www.w3.org/2000/svg", "circle"); circle.setAttribute("cx", event.offsetX); circle.setAttribute("cy", event.offsetY); circle.setAttribute("r", 10); circle.setAttribute("fill", randomColor()); circle.setAttribute("opacity", 1); svg.appendChild(circle); var t = setInterval(function() { var r = parseInt(circle.getAttribute("r")); r++; circle.setAttribute("r", r); var opacity = parseFloat(circle.getAttribute("opacity")); opacity -= 0.005; circle.setAttribute("opacity", opacity); if (opacity <= 0) { circle.parentNode.removeChild(circle); clearInterval(t); } }, 10); } function randomColor() { var r = Math.floor(Math.random() * 256); var g = Math.floor(Math.random() * 256); var b = Math.floor(Math.random() * 256); return "rgb(" + r + "," + g + "," + b + ")"; } </script> </body> </html>
原文地址：SVG点击实现动态放大的圆效果
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