<div id="app1" class="wrap">
 <ul class="tabs">
 <li class="active"><a href="javascript:" >标签1</a></li>
 <li><a href="javascript:" >标签2</a></li>
 <li><a href="javascript:" >标签3</a></li>
 </ul>
 <div class="tabs-con">
 <p>内容1</p>
 </div>
 <div class="tabs-con">
 <p>内容2</p>
 </div>
 <div class="tabs-con">
 <p>内容3</p>
 </div>
</div>

<style type="text/css">
 * {
 margin: 0;
 padding: 0;
 border-style: none;
 }
 ul,ol {
 list-style: none;
 }
 a {
 text-decoration: none;
 color: #777;
 }
 body {
 font: normal 14px/1.6 Helvetica,"Microsoft YaHei";
 color: #777;
 background-color: #f5f5f5;
 }
 .wrap {
 width: 600px;
 margin: 20px auto 0;
 }
 .tabs {
 overflow: auto;
 }
 .tabs li {
 float: left;
 }
 .tabs li a {
 display: block;
 padding: 10px 15px;
 color: #bbb;
 }
 .tabs li.active {
 background-color: #fff;
 }
 .tabs li.active a {
 color: #333;
 }
 .tabs-con {
 padding: 15px;
 background-color: #fff;
 }
</style>

var app1 = new Vue ({
 el: '#app1',
 data: {
 //标签列表的数据，是数组，数组项是对象格式
 tabs: [
  {name:'标签1'},
  {name:'标签2'},
  {name:'标签3'}
 ],
 num: 0
 },
 //方法，建立自定义函数，对应点击时间onclick
 methods: {
 tabsSwitch(index) {
  //用到的变量要加上this，表示使用上面构造函数app1的对象num
  this.num = index;
 }
 }
})

<div id="app1" class="wrap">
 <ul class="tabs">
 <li v-for="(tab,index) in tabs" :class="{active:num===index}" @click="tabsSwitch(index)"><a href="javascript:">{{tab.name}}</a></li>
 </ul>
 <div class="tabs-con" v-show="num===0">
 <p>内容1</p>
 </div>
 <div class="tabs-con" v-show="num===1">
 <p>内容2</p>
 </div>
 <div class="tabs-con" v-show="num===2">
 <p>内容3</p>
 </div>
</div>