<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset = utf-8">
<title>HTML5</title>
<script type="text/javascript" charset = "utf-8">
//这个函数将在页面完全加载后调用
function pageLoaded()
{
//获取canvas对象的引用,注意tCanvas名字必须和下面body里面的id相同
var canvas = document.getElementById('tCanvas');
//获取该canvas的2D绘图环境
var context = canvas.getContext('2d');
//绘制代码将出现在这里
//设置填充颜色为红色
context.fillStyle = "red";
//画一个红色的实心矩形
context.fillRect(50,50,100,40);
//设置边线颜色为绿色
context.fillStyle = "green";
//画一个绿色空心矩形
context.strokeRect(120,100,100,35);
//使用rgb()设置填充颜色为蓝色
context.fillStyle = "rgb(0,0,255)";
//画一个蓝色的实心矩形
context.fillRect(80,230,100,40);
//设置填充色为黑色且alpha值(透明度)为0.2
context.fillStyle = "rgba(0,0,0,0.2)";
//画一个透明的黑色实心矩形
context.fillRect(300,180,100,50);
}
</script>
</head>
<body onload="pageLoaded();">
<canvas width = "500" height = "300" id = "tCanvas" style = "border:black 1px solid;">
<!--如果浏览器不支持则
显示如下字体-->
提示：你的浏览器不支持<canvas>标签
</canvas>
</body>
</html>
