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<!DOCTYPE html>
<html>
<head><title>javascript</title>
<script>
function draw(){
var canvas=document.getElementById("canvas");
var context=canvas.getContext("2d");
var img = new Image();
img.src="http://avatar.profile.csdn.net/2/4/4/2_dadedu.jpg";
img.onload = function(){
context.drawImage(img,50,50);
}
}
</script>
</head>
<body onload="draw();">
<canvas id="canvas" width="800" height="800"></canvas>
</body>
</html>