Canvas-a13prototype.html

<!DOCTYPE HTML><HTMLLang= "en"><Head>    <MetaCharSet= "UTF-8">    <title>Extension methods</title></Head><Body>    <CanvasID= "Canvas"style= "margin:0 auto;border:1px #ddd Solid">the current browser does don't support Canvas, can replace the browser a try! </Canvas>    <Script>        varCanvas=document.getElementById ('Canvas'); //the new APICanvasRenderingContext2D.prototype.fillStar= function(R,r,x,y,rot) { This. Beginpath ();  for(varI=0; I<5; I++){                 This. LineTo (Math.Cos ( -+I* the -rot)/180*math.pi) *r+x,                            -Math.sin (( -+I* the -rot)/180*math.pi) *r+y);                 This. LineTo (Math.Cos ( Wu+I* the -rot)/180*math.pi) *r+x,                            -Math.sin (( Wu+I* the -rot)/180*math.pi) *r+y);            }             This. Closepath ();  This. Fill (); } window.onload= function() {canvas.width= 1024x768; Canvas.height= 768; if(Canvas.getcontext ('2d')){                varContext=Canvas.getcontext ('2d'); //beginContext.fillstyle= "#058"; //Call the new APIContext.fillstar ( Max, -, -, -,0)            }Else{alert ('the current browser does not support canvas, please change the viewer and try again! '); }        }    </Script></Body></HTML>

Canvas-a13prototype.html