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21-style属性操作-百度皮肤.html
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21-style属性操作-百度皮肤.html
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<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
* {
padding: 0;
margin: 0;
}
body {
background: url("images/21-1.jpg") no-repeat;
}
.box {
height: 110px;
padding: 40px;
text-align: center;
background: rgba(255, 255, 255, 0.5);
}
img {
cursor: pointer;
}
</style>
</head>
<body>
<div class="box" id="box">
<img src="images/21-1.jpg" width="200" />
<img src="images/21-2.jpg" width="200" />
<img src="images/21-3.jpg" width="200" />
<img src="images/21-4.jpg" width="200" />
<img src="images/21-5.jpg" width="200" />
</div>
<script>
//需求：鼠标点击img图片，body的背景被修改。
//步骤：
//1.获取事件源和相关元素
//2.绑定事件
//3.书写事件驱动程序（修改body的背景）
//1.获取事件源和相关元素
var box = document.getElementById("box");
var body = document.body;
var imgArr = box.children;
//2.绑定事件
for (var i = 0; i < imgArr.length; i++) {
//自定义属性
imgArr[i].index = i;
imgArr[i].onclick = function() {
//3.书写事件驱动程序（修改body的背景）
//body.style.background = "url(images/21-"+(this.index+1)+".jpg) no-repeat";
body.style.backgroundImage = "url(images/21-" + (this.index + 1) + ".jpg)";
}
}
</script>
</body>
</html>