[ html canvas shadowOffsetX shadowOffsetY shadowBlur shadowColor ] canvas绘图属性 shadowOffsetX shadowOffsetY shadowBlur shadowColor 属性演示

 1 <!DOCTYPE html>
 2 <html lang='zh-cn'>
 3 <head>
 4 <title>Insert you title</title>
 5 <meta name='description' content='this is my page'>
 6 <meta name='keywords' content='keyword1,keyword2,keyword3'>
 7 <meta http-equiv='Content-Type' content='text/html; charset=utf-8'>
 8 <link rel='stylesheet' type='text/css' href='./css/index.css' />
 9 <script type='text/javascript' src='./js/jquery-1.12.1.min.js'></script>
10 <style type='text/css'>
11 html,body,canvas {
12     margin: 0; padding: 0;
13 }
14 
15 html {
16     height: 100%
17 }
18 
19 body {
20     background: #000;
21 }
22 
23 #can {
24     background: #FFF; display: block; margin: 25px auto; border-radius: 2px; line-height: 0;
25 }
26 </style>
27 <script type='text/javascript'>
28     $( function(){
29         var can = $( '#can' ).get( 0 );
30         var oCan = can.getContext( '2d' );
31         var w = can.width;
32         var h = can.height;
33         oCan.font = '900 50px Courier New'; /* 可以补充加粗方式但字号 字体缺一不可 并且以不同的方式来进行填充是可以更改字体的 */
34         oCan.strokeStyle = '#F00';
35         oCan.textAlign = 'center' /* 设置水平居中方式 */
36         oCan.textBaseline = 'middle'; /* 设置垂直居中方式 */
37         oCan.shadowOffsetX = 2;            /* 设置阴影的问题存在兼容问题 火狐不支持  并且只能单独设置*/
38         oCan.shadowOffsetY = 2;
39         oCan.shadowBlur = 7;
40         oCan.shadowColor = 'rgba(32,96,126,.9)';
41         oCan.fillText( 'chuangling' , w / 2 , h / 2 ); /* 创建文本的自适应居中方式  */
42     } );
43 </script>
44 </head>
45 <body>
46     <canvas id='can' width='500' height='450'>检测到您的浏览器版本过低请升级您的浏览器版本,以获取更好的使用体验...</canvas>
47 </body>
48 </html>