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圆形渐变.html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
	<title>圆形渐变</title>
</head>
<body>
	<canvas id="mycanvas1" width="500" height="300" style="border: 1px solid #d3d3d3"></canvas>
			<script type="text/javascript">
				var c=document.getElementById('mycanvas1');
				var ctx=c.getContext("2d");
				var grd=ctx.createRadialGradient(180,125,10,180,125,100);
				grd.addColorStop(0.3,"white");
				grd.addColorStop(0.4,"red");
				grd.addColorStop(0.5,"mediumspringgreen");
				grd.addColorStop(0.6,"yellow");
				grd.addColorStop(0.7,"lime");
				grd.addColorStop(0.8,"springgreen");
				grd.addColorStop(0.9,"blue");
				grd.addColorStop(1,"darkorchid");
				ctx.beginPath();

				ctx.lineWidth="6";
				ctx.strokeStyle="darkorchid";
				ctx.arc(180,125,100,0,1*Math.PI,true);
				ctx.stroke();
				ctx.fillStyle=grd;
				ctx.fill();

</script>

</body>
</html>