canvas--改变颜色

 1 <canvas id="c1" width="400" height="400" style="background-color:red">
 2     </canvas>
 3 
 4     <script type="text/javascript">
 5         //获取画布元素
 6         var canvas=document.getElementById("c1");
 7         //绘制环境（我称为“画笔”）
 8         var cxt=canvas.getContext("2d");
 9         
10         //改变填充的颜色
11         cxt.fillStyle="#ffff00";
12         //画一个实体方块---fillrect(x,y,w,h);
13         cxt.fillRect(50,50,100,100);
14         
15         //改变边框颜色
16         cxt.strokeStyle="blue";
17         //改变边框宽度
18         cxt.lineWidth=5;
19         //画出一个空心方块---strokeRect(x,y,w,h);
20         //cxt.strokeRect(200,200,100,100);
21         cxt.strokeRect(200.5,200.5,100,100);
22     </script>