var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
var img=document.getElementById("user");
ctx.drawImage(img,10,10);
<img id="user" src="https://img2.baidu.com/it/u=325567737,3478266281&fm=26&fmt=auto&gp=0.jpg">
<canvas id='mycanvas' width="500" height="500"></canvas>