<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="utf-8" />
<title>绘制彩色回型框</title>
</head>
<body>
<canvas id="myCanvas" width="1000" height="1000" style="border: 2px solid black;"></canvas>
<script>
var canvas=document.getElementById("myCanvas");
var context=canvas.getContext("2d");
context.beginPath(); //里面的矩形
context.moveTo(500,500);
context.lineTo(550,500);
context.lineTo(550,550);
context.lineTo(500,550);
context.closePath();
context.fillStyle="yellow";
context.fill();
context.stroke();
context.beginPath();
context.moveTo(450,450);
context.lineTo(600,450);
context.lineTo(600,600);
context.lineTo(450,600);
context.closePath();
context.lineWidth=25;
context.border="blue";
context.stroke();
</script>
</body>
</html>
