JS代码：
function hi() {
var c = document.getElementById("mycanvas");
var cxt = c.getContext();
var img = new Image();
img.src = "test.png";
cxt.drawImage(img, 0, 0);
}
web代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript" src="JScript1.js"></script>
</head>
<body>
<canvas id="mycanvas"></canvas>
<button onclick="hi();">显示图片</button>
</body>
</html>
点击显示图片一点反应都木有
