tab栏切换
效果：
当鼠标通过上边tab栏时，对应的元素变亮并切换到相应的菜单
<!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:;">精选</a></li><li><a href="javascript:;">美食</a></li><li><a href="javascript:;">百货</a></li><li><a href="javascript:;">个护</a></li><li><a href="javascript:;">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>// 1. a模块制作 要给5个链接绑定鼠标经过事件// 1.1 获取a元素const as=document.querySelectorAll('.tab-nav a')for(let i=0;i<as.length;i++){// 要给5个链接绑定鼠标经过事件as[i].addEventListener('mouseenter',function(){// 排他思想// 干掉别人 移除类activedocument.querySelector('.tab-nav .active').classList.remove('active')// 我登基 我添加类activethis.classList.add('active')// 下面5个大盒子一一对应 .item// 干掉别人 移除类activedocument.querySelector('.tab-content .active').classList.remove('active')// 对应序号的那个item显示 添加类activedocument.querySelector(`.tab-content .item:nth-child(${i+1})`).classList.add('active')})}</script></body></html>
