<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
#e-coder{
background: url("1.jpg") no-repeat;
background-size: 50px 50px;
position: fixed;
top: 40%;
left: 0;
500px;
height: 500px;
}
#e-app{
300px;
position: absolute;
left:60px;
top: -50px;
display: none;
}
</style>
</head>
<body>
<div id="e-coder">
<div id="e-app">
<img src="2.jpg" alt="公众号">
</div>
</div>
<script>
window.onload=function(){
var coder=document.getElementById('e-coder');
var app=document.getElementById('e-app');
coder.onmouseover=function(){
app.style.display='block';
this.style.background="url(4.jpg) no-repeat";
}
coder.onmouseout=function(){
app.style.display='none';
this.style.background="url(1.jpg) no-repeat";
}
}
</script>
</body>
</html>