var cxt=c.getContext("2d")
cxt.fillStyle="#FF0000"
cxt.beginPath()
cxt.arc(70,18,15,0,Math.PI*2,true)
cxt.closePath()
cxt.fill()
<!DOCTYPE html><html lang="en">
<head>
<meta charset="UTF-8">
<title>画圆</title>
<script src="http://apps.bdimg.com/libs/raphael/2.1.2/raphael-min.js"></script>
</head>
<body>
<div id="holder"></div>
<script>
var paper = Raphael( "holder", 400, 400 )
var circle = paper.circle(200, 200, 150) // 从200,200 开始画一个半径150的圆
circle.attr("fill", "#f00") //并用红色填充
</script>
</body>
</html>
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