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回答

var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
var imageObj1 = new Image();
var imageObj2 = new Image();
imageObj1.src = "1.png"
imageObj1.onload = function() {
ctx.drawImage(imageObj1, 0, 0, 328, 526);
imageObj2.src = "2.png";
imageObj2.onload = function() {
ctx.drawImage(imageObj2, 15, 85, 300, 300);
var img = c.toDataURL("image/png");
document.write('<img src="' + img + '" width="328" height="526"/>');
}
};

由于安全跨域原因 图片和js文件必须在同一个域名下

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