html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript" src="24.js"></script>
<style type="text/css">
body{ margin:0; padding:0;}
</style>
</head>
<body onBlur="draw(‘canvas‘);">
<canvas id="canvas" width="400" height="300"></canvas>
</body>
</html>
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js
// JavaScript Document
function draw(id){
var canvas = document.getElementById(id);
var context = canvas.getContext(‘2d‘);
context.fillStyle = "green";
context.strokeStyle = "#fff";
context.lineWidth = 5;
context.fillRect(0,0,400,300);
context.strokeRect(50,50,180,120);
context.strokeRect(110,110,180,120);
}
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效果图：
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原文：http://onestopweb.iteye.com/blog/2260599