html5 把指定的图片绘制到Canvas
<!DOCTYPE html>
<html>
<body>
<p>Image to use:</p>
<img id="scream" src="the_scream.jpg" alt="The Scream" width="220" height="277" />
<p>Canvas:</p>
<canvas id="myCanvas" width="250" height="300" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>
<script type="text/javascript">
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
var img=document.getElementById("scream");
ctx.drawImage(img,10,10);
</script>
</body>
</html>
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