1、canvas阴影

  1. <style>
  2.     canvas {
  3.         width: 500px;
  4.         height: 300px;
  5.         border: 1px solid;
  6.     }
  7. </style>
  8. </head>
  9. <body>
  10. <canvas id="can" width="500px" height="300px"></canvas>
  11. <script>
  12.     var canvas = document.getElementById("can");
  13.     var ctx = canvas.getContext("2d");
  15.    ctx.beginPath();
  17.    ctx.shadowColor = "black";//阴影颜色
  18.    ctx.shadowBlur = 30; //阴影大小，阴影是骑在线上的
  19.    ctx.sahdowOffsetX = 15; //ctx.sahdowOffsetY
  21.    ctx.fillRect(0,0,200,200);
  22. </script>
  23. </body>