<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
.focus {
position: relative;
width: 300px;
height: 300px;
border: 5px solid blue;
margin: 50px auto;
}
.focus img {
position: absolute;
top: 0;
left: 0
}
.focus p {
position: absolute;
bottom: 0;
left: 0;
width: 100%;
height: 30px;
line-height: 30px;
text-align: center;
}
.focus span {
display: inline-block;
width: 20px;
height: 20px;
background: blue;
color: #fff;
line-height: 20px;
cursor: pointer;
}
.focus span.active {
background: red;
}
.focus h2 {
z-index: 11;
position: absolute;
top: 0;
left: 0;
width: 100%;
background: rgba(255, 0, 0, 0.5);
font-size: 16px;
height: 30px;
line-height: 30px;
text-align: center;
color: #fff;
}
</style>
<div class="focus" id="focus">
<!-- 标题 -->
<h2>狗子1</h2>
<img src="./img/1.jpg" width="300" height="300" />
<p>
<span class="active">1</span>
<span>2</span>
<span>3</span>
<span>4</span>
</p>
</div>
<script>
//点击不同的序号 让图片切换到对应的图片 将标题也切换为对应的标题 让点击的序号亮起，其他序号灭掉
var title = document.getElementsByTagName("h2")[0];
var img = document.getElementsByTagName("img")[0];
var spans = document.getElementsByTagName('span');
//声明一个记录图片路径的数组
var imgArr = [
"./img/1.jpg",
"./img/2.jpg",
"./img/3.jpg",
"./img/4.jpg"
]
//1.点击序号 切换对应图片
for(var i=0; i<spans.length; i++){
spans[i].idx = i;
spans[i].onclick = function(){
// 切换对应图片
img.src = imgArr[this.idx];
//切换标题
title.innerText = "狗子"+(this.idx+1);
//让当前点击的span亮起 其他span灭掉 排他思想
//干掉所有人
for(var j=0; j<spans.length; j++){
spans[j].className = "";
}
this.className = "active";
}
}
</script>
</body>
</html>