描述：当用户点击背景的时候，背景进行切换
示例代码：(图片换成自己的路径哦)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>皮肤更换</title>
</head>
<style>
*{
padding: 0;
margin: 0;
}
body{
background: url("./images/1.jpg") no-repeat;
}
.box{
height: 165px;
padding-top: 35px;
text-align: center;
background: rgba(255,255,255,0.3);
}
img{
width: 200px;
cursor: pointer;
margin: 0 10px;
}
</style>
<body>
<div class="box">
<img src="./images/1.jpg" alt="">
<img src="./images/2.jpg" alt="">
<img src="./images/3.jpg" alt="">
<img src="./images/4.jpg" alt="">
<img src="./images/5.jpg" alt="">
</div>
</body>
</html>
<script>
var box = document.getElementsByTagName("div")[0];
var body = document.body;
var imgArr = box.children;
for (var i = 0;imgArr.length;i++){
imgArr[i].index = i;
imgArr[i].onclick = function () {
body.style.backgroundImage = "url("+this.src+")";
}
}
</script>