代码：
<!DOCTYPE html><html lang="utf-8"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><head> ????<title>五角星</title> ???</head> ????<body onload="draw()"> ???????<canvas id="myCanvus" width="200px" height="200px" style="border:0px dashed black;"> ???????????出现文字表示你的浏览器不支持HTML5 ???????</canvas> ????</body></html><script type="text/javascript"><!-- ???function draw(){ ???????var canvas=document.getElementById("myCanvus"); ???????var context=canvas.getContext("2d"); ???????context.fillStyle = "yellow"; ???????context.fillRect(0, 0, 200, 200); ???????context.strokeStyle = "rgb(250,0,0)"; ???????context.fillStyle = "rgb(250,0,0)" ???????context.beginPath(); ???????context.moveTo(100, 0); ???????context.lineTo(100+Math.cos(Math.PI*3/10)*100, 100+Math.sin(Math.PI*3/10)*100); ???????context.lineTo(100-Math.cos(Math.PI*1/10)*100, 100-Math.sin(Math.PI*1/10)*100); ???????context.lineTo(100+Math.cos(Math.PI*1/10)*100, 100-Math.sin(Math.PI*1/10)*100); ???????context.lineTo(100-Math.cos(Math.PI*3/10)*100, 100+Math.sin(Math.PI*3/10)*100); ???????context.lineTo(100, 0); ???????context.fill(); ???????context.stroke(); ???????context.closePath(); ???}//--></script>HTML5 Canvas 绘制五角星
原文地址：http://www.cnblogs.com/xiandedanteng/p/7467450.html