<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>全屏图片</title>
<style>
div#div1{
position:fixed;
top:0;
left:0;
bottom:0;
right:0;
z-index:-1;
}
div#div1 > img {
height:100%;
width:100%;
border:0;
}
</style>
</head>
<body>
<div id="div1"><img src="../image/loginsize.png" /></div>
</body>
</html>