javascript如何把这个飘窗纯色背景换成一个图片背景？

Question

document.body.innerHTML=document.body.innerHTML+
"<div id='s1'>"+"</div>";
s1.style.width="175px";
s1.style.height="175px";
s1.style.marginLeft="0px";
s1.style.marginTop="0px";
s1.style.background="#ffaa7f"
s1.style.fontSize="15px";
s1.innerHTML="姓名：xxx<br>电话:<br>班级:xx1901";
s1.style.position="absolute";

 

Answer 1

s1.style.background='url("1.jpg")';