<!DOCTYPE html> <html lang="en"> <head><meta charset="UTF-8"><title>扩展方法</title> </head> <body><canvas id="canvas" style="margin:0 auto;border:1px #ddd solid">The current browser does not support Canvas, can replace the browser a try!</canvas><script>var canvas = document.getElementById('canvas');// 新的API CanvasRenderingContext2D.prototype.fillStar = function(r,R,x,y,rot){this.beginPath();for(var i=0;i<5;i++){this.lineTo(Math.cos( (18+i*72 -rot)/180*Math.PI )*R+x,-Math.sin( (18+i*72 -rot)/180*Math.PI )*R+y);this.lineTo(Math.cos( (54+i*72 -rot)/180*Math.PI )*r+x,-Math.sin( (54+i*72 -rot) /180*Math.PI )*r+y); }this.closePath();this.fill();}window.onload = function(){canvas.width = 1024;canvas.height = 768;if(canvas.getContext('2d')){var context = canvas.getContext('2d');// begin context.fillStyle = "#058";// 调用新的API context.fillStar(150,300,400,400,0)}else{alert('当前游览器不支持Canvas，请更换游览器后再试！');}}</script> </body> </html>
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