<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
<style>
*{
padding:0px;
margin:0px;
}
body{
background:url(8.jpg) top center;
}
div{
100%;
height:150px;
background-color: pink;
text-align:center;
padding-top:50px;
}
div img{
cursor:pointer;
}
</style>
<script>
window.onload=function()
{
var p1=document.getElementById("p1");
p1.onclick=function(){
document.body.style.backgroundImage="url(images/3.jpg)";
}
var p2=document.getElementById("p2");
p2.onclick=function(){
document.body.style.backgroundImage="url(images/4.jpg)";
}
var p3=document.getElementById("p3");
p3.onclick=function(){
document.body.style.backgroundImage="url(images/5.jpg)";
}
}
</script>
</head>
<body>
<div>
<img src="3.jpg" alt="" width="150px" id="p1"/>
<img src="4.jpg" alt="" width="150px" id="p2"/>
<img src="5.jpg" alt="" width="150px" id="p3"/>
</div>
</body>
</html>
每张图片一点击，整个文档的背景图片就会更换为所点击的图片
注意，获取body元素 ： document.body