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var c=document.getElementById("myCanvas");
var cxt=c.getContext("2d");
var img=new Image()
img.src="https://img-bbs.csdn.net/upload/201504/15/1429063235_95878.jpg"
var simg = new Image();
simg.src = "https://img-bbs.csdn.net/upload/201504/15/1429063244_425729.jpg"
cxt.drawImage(img,0,0);
cxt.drawImage(simg,0,0);
你用png图片不就是透明的了吗?