那里出了错误？没有效果

来源：9-2 编程练习

陈子长

2018-11-22 16:04:54

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>canvas图片</title>
<style>
canvas{background-color:lightblue;}
</style>
</head>
<body>
<canvas id="canvas" width="600px" height="600px">您的浏览器不支持canvas
</canvas>
<canvas id="can" width="600px" height="600px">您的浏览器不支持canvas
</canvas>
<script>
var canvas=document.getElementById("canvas");
var context=canvas.getContext('2d');
        //在此处补充代码
var img = new Image();
img.src = "http://climg.mukewang.com/5aa6633400017bc704170220.jpg";
img.onload = function () {
context.drawImage(img, 0, 0, canvas.width, canvas.height);
}

var can = document.getElementById("can");
var cxt = can.getContext('2d');
cxt.font='50px sans-serif';
cxt.fillStyle='white';
cxt.fillText("==www.imooc.com==", 40, 400);
context.drawImage(can, 0, 0, can.width, can.height, 0, 0, canvas.width, canvas.height);

</script>
</body>
</html>

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