解决方法：canvas的宽度和高度必须内联在canvas标签中。
错误示例：
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| <html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
#mycanvas{
width: 200px;
height: 200px;
background: yellow;
}
</style>
</head>
<body>
<canvas id='mycanvas' ></canvas>
</body>
</html>
|
正确示例：
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| <canvas id='mycanvas' width='200px' height='200px' style='background:yellow'></canvas>
|
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