老师帮忙看下代码

来源：6-4 编程练习

人生的起源

2019-12-21 23:23:43

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>canvas图片</title>
    <style>
        canvas{background-color:lightblue;}
    </style>
</head>
<body>
    <canvas id="canvas" width="800px" height="800px">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
        context.arc(400, 400, 170, 0, 2*Math.PI, true);
        context.fill();
        var img = new Image();
        img.src = 'http://climg.mukewang.com/59859f4d00014f1503000100.jpg';
        img.onload = function(){
            context.drawImage(img, 250, 350);
        }
    </script>
</body>
</html>

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