js 'getContext' of null
Uncaught TypeError: Cannot read property 'getContext' of null
才接触js，网上搜了很久没找到有用的，为什么我这个图片加载不出来
<!DOCTYPE html>
<html dir="ltr">
<head>
<meta charset="utf-8">
<title>哈哈哈哈哈</title>
</head>
<body>
<canvas id="'myCanvas" width="200" height="400"style="border:1px solid #c3c3c3;">
</canvas>
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var img = new Image();
img.onload = function(){
context.drawImage(img,0,0);
};
img.src='uu.png';
</script>
</body>
</html>
尚方宝剑之说浏览 1472回答 2
2回答
-
慕丝7291255
ID错误了啊。。。多了个单引号。。 <canvas id="myCanvas" -
眼眸繁星
你把img.src='uu.png'；放到img.onload上面看下。如果还不可以检查下你的图片路径。var canvas = document.getElementById('myCanvas');var context = canvas.getContext('2d');var img = new Image();img.src='uu.png';img.onload = function(){context.drawImage(img,0,0);};
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