canvas-9NonZeroAroundPrinciples.html_html/css_WEB-

             非零环绕原则                The current browser does not support Canvas, can replace the browser a try!                  window.onload = function(){            var canvas = document.getElementById('canvas');            canvas.width = 1024;            canvas.height = 768;            if(canvas.getContext('2d')){                var context = canvas.getContext('2d');                context.beginPath();                    context.arc(400,400,300,0,Math.PI*2,false);                    context.arc(400,400,150,0,Math.PI*2,true);                context.closePath();                context.fillStyle = "#058";                context.shadowColor = "gray";                context.shadowOffsetX = 10;                context.shadowOffsetY = 10;                context.shadowBlur = 10;                context.fill();            }else{                alert('当前游览器不支持Canvas，请更换游览器后再试！');            }        }        

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