代码
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>慕课网Wiki</title>
<style>
#imooc{
border:1px solid #ccc;
}
</style>
</head>
<body>
<canvas id="imooc">您的浏览器不支持 HTML5 canvas 标签</canvas>
<script>
const canvas = document.getElementById('imooc');
const ctx = canvas.getContext('2d');
ctx.strokeStyle="blue";
ctx.lineWidth=8;
ctx.rect(10,10,200,100); //调用了直接绘制矩形函数
ctx.stroke();
</script>
</body>
</html>
运行结果