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<!DOCTYPE html>
<html>
<head>
<title>HTML canvas strokeRect() 方法的使用(大卫编程网 div.cn)</title>
</head>
<body>
<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
您的浏览器不支持 HTML5 canvas 标签。
</canvas>
<script>
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.strokeRect(20,20,100,100);
</script>
</body>
</html>