HTML+CSS实现
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Demo</title>
<style type="text/css">
div{
position: relative;
}
input{
opacity:0;
filter:alpha(opacity=0);
height: 95px;
width: 100px;
position: absolute;
top: 0;
left: 0;
z-index: 9;
}
</style>
</head>
<body>
<div>
<input type="file">
<img src="image/2.jpg">
</div>
</body>
</html>