先看看最简单的效果图：
代码如下：
JavaScript Code复制内容到剪贴板 var canvas = document.getElementById(my), ctx = canvas.getContext(2d); setInterval(function(){ ctx.clearRect(0,0,400,400); ctx.save(); ctx.translate(200,200); var ci =90, pi = Math.PI / ci, x1 = 100, y1 =0, x2 =0, y2 =0, x3 =0, y3 =0; ctx.beginPath(); for(var i = ci *2; i >0; i--){ ctx.rotate(pi); ctx.moveTo(x1,y1); y2 = x1 * Math.sin(pi); x2 = x1 * Math.cos(pi); x3 = (x1 - x2) /2+ x2 +10+ Math.random() *20; y3 = y2 /2; ctx.lineTo(x3,y3); ctx.lineTo(x2,y2); } ctx.stroke(); ctx.restore(); },100);
在上面多角形的基础上进一步之后为：
代码如下：
JavaScript Code复制内容到剪贴板 var canvas = document.getElementById(my), ctx = canvas.getContext(2d), r =10; setInterval(function(){ ctx.clearRect(0,0,400,400); ctx.save(); ctx.translate(200,200); var grad = ctx.createRadialGradient(0,0,0,0,0,r+20); grad.addColorStop(0.2,white); grad.addColorStop(0.7,yellow); grad.addColorStop(0.8,orange); ctx.beginPath(); ctx.fillStyle = grad; ctx.arc(0,0,r,0,Math.PI*2,true); ctx.fill(); var ci =90, pi = Math.PI / ci, x2 =0, y2 =0, x3 =0, y3 =0; x1 =100; y1 =0; ctx.beginPath(); for(var i = ci *2; i >0; i--){ ctx.rotate(pi); ctx.moveTo(r,0); y2 = r * Math.sin(pi); x2 = r * Math.cos(pi); x3 = (r - x2) /2+ x2 +10+ Math.random() *20; y3 = y2 /2; ctx.lineTo(x3,y3); ctx.lineTo(x2,y2); } ctx.fill(); ctx.restore(); r <=100&& (r +=2); },100);以上就是本文的全部内容，希望对大家的学习有所帮助。
