利用HTML5 Canvas API绘制矩形的超级攻略

使用closePath()闭合图形
首先我们用最普通的方法绘制一个矩形。

JavaScript Code复制内容到剪贴板

<!DOCTYPE html> <html lang="en">
<head> <meta charset="UTF-8">
<title></title> </head>
<body> <!DOCTYPE html>
<html lang="zh"> <head>
<meta charset="UTF-8"> <title>绘制矩形</title>
</head> <body>
<div id="canvas-warp"> <canvas id="canvas" style="border: 1px solid #aaaaaa; display: block; margin: 50px auto;">
你的浏览器居然不支持Canvas？！赶快换一个吧！！ </canvas>
</div>
<script> window.onload = function(){
var canvas = document.getElementById("canvas"); canvas.width = 800;
canvas.height = 600; var context = canvas.getContext("2d");
context.beginPath();
context.moveTo(150,50); context.lineTo(650,50);
context.lineTo(650,550); context.lineTo(150,550);
context.lineTo(150,50); //绘制最后一笔使图像闭合 context.lineWidth = 5;
context.strokeStyle = "black"; context.stroke();
}
</script> </body>
</html> </body>
</html>