三种方法实现tab栏切换（CSS方法、JS方法、Vue方法）

一、需求

给下图的静态页面添加tab栏切换效果

二、CSS方法

<!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: 0;padding: 0;}ul {display: flex;border-bottom: 2px solid #e01222;padding: 0 10px;}li {width: 100px;height: 50px;line-height: 50px;list-style: none;text-align: center;}li a {display: block;text-decoration: none;font-weight: bold;color: #333333;}li a.active:active,li a.active:focus {background-color: #e01222;color: #fff;}</style>
</head>
<body><div id="app"><ul><li><a class="active" href="#">京东秒杀</a></li><li><a class="active" href="#">每日特价</a></li><li><a class="active" href="#">品类秒杀</a></li></ul></div></body>
</html>

三、JS方法

<!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: 0;padding: 0;}ul {display: flex;border-bottom: 2px solid #e01222;padding: 0 10px;}li {width: 100px;height: 50px;line-height: 50px;list-style: none;text-align: center;}li a {display: block;text-decoration: none;font-weight: bold;color: #333333;}li a.active {background-color: #e01222;color: #fff;}</style>
</head>
<body><div id="app"><ul><li><a class="active" href="#">京东秒杀</a></li><li><a href="#">每日特价</a></li><li><a href="#">品类秒杀</a></li></ul></div><script>document.querySelector('#app ul').addEventListener('click',e=>{if(e.target.tagName==='A'){document.querySelector('.active').classList.remove('active')e.target.classList.add('active')}})</script>
</body>
</html>

四、Vue方法

<!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: 0;padding: 0;}ul {display: flex;border-bottom: 2px solid #e01222;padding: 0 10px;}li {width: 100px;height: 50px;line-height: 50px;list-style: none;text-align: center;}li a {display: block;text-decoration: none;font-weight: bold;color: #333333;}li a.active {background-color: #e01222;color: #fff;}</style>
</head>
<body><div id="app"><ul><li v-for="(item,index) in list" :key="item.id"><a :class="{active:index===activeIndex}" @click="activeIndex=index" href="#">{{item.name}}</a></li></ul></div><script src="./vue.js"></script><script>const app = new Vue({el: '#app',data: {activeIndex:0,list: [{ id: 1, name: '京东秒杀' },{ id: 2, name: '每日特价' },{ id: 3, name: '品类秒杀' }]}})</script>
</body>
</html>

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