为什么绘制不出来呀，哪位大神帮忙看一下嘛
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>123</title>
<style type="text/css">
canvas{background:; border: 1px dashed black}
</style>
</head>
<body>
<canvas id='canvas' width="500" height="500">你的浏览器版本过低，无法显示</canvas>
<script type="text/javascript">
c.lineWidth=10;
c.strokeStyle ="#EE3B3B";
var canvas=document.getElementById('canvas');
var c=canvas.getContext('2d');
c.moveTo(50,50)
c.lineTo(150,150)
c.stroke()
c.beginPath()
c.rect(200,200,50,50);
c.stroke();
</script>
</body>
</html>