HTML5 绘制阴影

代码：
<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">

    <title>绘制阴影</title>
   <script>
       function init()  {
           var canvas=document.getElementById('canvas');
           var ctx=canvas.getContext("2d");
           ctx.shadowBlur=1.5;
           ctx.shadowColor="red";
           ctx.shadowOffsetX=5;
           ctx.shadowOffsetY=5;
           ctx.strokeStyle="blue";
           ctx.font=" italic 40px 宋体";
           ctx.strokeText("你好",200,200);


       }

   </script>

</head>
<body   onload="init();">
<canvas  id="canvas" width="400"  height="300"  style="border:2px blueviolet solid"></canvas>
</body>
</html>
　　效果：
2017-09-08 12:36:38