<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0px;
padding: 0px;
list-style: none;
}
ul {
width: 830px;
height: 100px;
margin: 100px auto;
}
li {
float: left;
margin-right: 10px;
width: 200px;
height: 100px;
cursor: pointer;
}
li:nth-of-type(4) {
margin-right: 0px;
}
li img {
width: 200px;
height: 100px;
}
body {
background: url('images/01.jpg');
}
</style>
</head>
<body>
<ul>
<li><img src="images/01.jpg" alt=""></li>
<li><img src="images/02.jpg" alt=""></li>
<li><img src="images/03.jpg" alt=""></li>
<li><img src="images/04.jpg" alt=""></li>
</ul>
<script>
var images = document.getElementsByTagName('img');
for (var i = 0; i < images.length; i++) {
images[i].onclick = function () {
// 因為body是唯一的，所以可以直接通過document.body獲取標簽
document.body.style.background = `url(${this.getAttribute('src')})`;
}
}
</script>
</body>
</html>
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