1.简述API
2.Cavans
e.g.画一个三角形
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Canvas</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
border: none;
}
canvas {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
display: block;
margin: auto;
background: #ececec;
}
</style>
<script type="text/javascript">
window.onload = function() {
// 在此完成任务
var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");
context.moveTo(100,100);
context.lineTo(400,100);
context.stroke();
context.moveTo(100,100);
context.lineTo(100,500);
context.stroke();
context.moveTo(100,500);
context.lineTo(400,100);
context.stroke();
};
</script>
</head>
<body>
<canvas id="canvas" width="800" height="600">注意，浏览器推荐使用Chrome！</canvas>
</body>
</html>
效果如下：
原文：http://www.cnblogs.com/lilijun/p/6913425.html