要在画布上绘制图像，请使用以下方法：
drawImage(image,x,y)
图像加载前无法绘制图像。 从window.onload（）调用此函数。
JavaScript:
window.onload = function() {
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var img = document.getElementById("scream");
ctx.drawImage(img, 10, 10);
};
完整源代码：
<!DOCTYPE html>
<html>
<body>
<p>Image to use:</p>
<p>Canvas:</p>
<canvas id="myCanvas" width="240" height="297" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.
</canvas>
<script>
window.onload = function() {
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var img = document.getElementById("scream");
ctx.drawImage(img, 10, 10);
};
</script>
</body>
</html>
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