<!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>tab栏切换</title>
<style>
* {
margin: 0;
padding: 0;
}
.tab {
width: 590px;
height: 340px;
margin: 20px;
border: 1px solid #e4e4e4;
}
.tab-nav {
width: 100%;
height: 60px;
line-height: 60px;
display: flex;
justify-content: space-between;
}
.tab-nav h3 {
font-size: 24px;
font-weight: normal;
margin-left: 20px;
}
.tab-nav ul {
list-style: none;
display: flex;
justify-content: flex-end;
}
.tab-nav ul li {
margin: 0 20px;
font-size: 14px;
}
.tab-nav ul li a {
text-decoration: none;
border-bottom: 2px solid transparent;
color: #333;
}
.tab-nav ul li a.active {
border-color: #e1251b;
color: #e1251b;
}
.tab-content {
padding: 0 16px;
}
.tab-content .item {
display: none;
}
.tab-content .item.active {
display: block;
}
</style>
</head>
<body>
<div class="tab">
<div class="tab-nav">
<h3>每日特价</h3>
<ul>
<li><a class="active" href="javascript:;" data-id="0">精选</a></li>
<li><a href="javascript:;" data-id="1">美食</a></li>
<li><a href="javascript:;" data-id="2">百货</a></li>
<li><a href="javascript:;" data-id="3">个护</a></li>
<li><a href="javascript:;" data-id="4">预告</a></li>
</ul>
</div>
<div class="tab-content">
<div class="item active"><img src="../images/tab00.png" alt="" /></div>
<div class="item"><img src="../images/tab01.png" alt="" /></div>
<div class="item"><img src="../images/tab02.png" alt="" /></div>
<div class="item"><img src="../images/tab03.png" alt="" /></div>
<div class="item"><img src="../images/tab04.png" alt="" /></div>
</div>
</div>
<script>
//采用事件委托形式tab栏切换
//获取父级元素ul。因为ul只有一个
const ul = document.querySelector('.tab-nav ul')
//添加事件
ul.addEventListener('click',function (e){
// console.log(e.target.tagName)
if (e.target.tagName === 'A'){
// console.log('wxdsa')
document.querySelector('.tab-nav .active').classList.remove('active')
e.target.classList.add('active')
// console.log(e.target.dataset.id)
const i = +e.target.dataset.id
//排他思想
document.querySelector('.tab-content .active').classList.remove('active')
document.querySelector(`.tab-content .item:nth-child(${i+1})`).classList.add('active')
}
})
</script>
</body>
</html>
报错一定要注意： e.target.dataset.id获取过来的是数组，要转成int类型。不要忘记’+‘号
const i = +e.target.dataset.id
