canvas实现绘画

html代码:
 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Title</title>
 6     <style>
 7         * {
 8             margin: 0;
 9             padding: 0;
10         }
11 
12         #myCanvas {
13             background: #abcdef;
14         }
15     </style>
16 </head>
17 <body>
18 <canvas id="myCanvas" width="550px" height="400px"></canvas>
19 <script src="main.js"></script>
20 </body>
21 </html>
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