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>