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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>文档标题</title>
</head>
<body>
<canvas id="mycanvas" width="300" height="200" style="border:1px solid orange"></canvas>
</body>
</html>
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var canvas=document.getElementById('mycanvas');
var ctx=canvas.getContext('2d');
ctx.moveTo(0,200);
ctx.lineTo(300,100);
ctx.stroke()
ctx.beginPath();
ctx.arc(150,80,66,0,2*Math.PI);
ctx.moveTo(150,0);
ctx.lineTo(0,100);
输入 CSS 代码……
