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<!DOCTYPE HTML>
<html>
<head>
<!--[if lt IE 9]><script language="javascript" type="text/javascript" src="/jqplot/excanvas.min.js"></script><![endif]-->
<script src=/scripts/jquery-1.8.3.min.js></script>
<script>
$(function() {
cxt = $('#myCanvas').get(0).getContext("2d");
dX = $('#myCanvas').offset().left;
dY = $('#myCanvas').offset().top;
$('#myCanvas').mousedown(function(e) {
cxt.beginPath();
cxt.arc(e.pageX - dX, e.pageY - dY, 10, 2*Math.PI, 0, true);
cxt.stroke();
});
});
</script>
</head>
<body>
<canvas id="myCanvas" width="679" height="420" style='background-image:url(1441549031_830713.png)'>
<p>Your browserdoes not support the canvas element!</p>
</canvas>
</body>
</html>
你自己想想该如何保存与上传那些点的坐标