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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<title> 页面名称 </title>
<style type="text/css">
canvas { background: #A9A9A0; }
</style>
</head>
<body>
<canvas id="canvas" width="500" height="300"></canvas>
<script type="text/javascript">
var canvas = document.getElementById("canvas");
var c = canvas.getContext("2d");
c.moveTo(0,0);
c.lineTo(200,200);
c.stroke();
</script>
</body>
</html>