1、uniapp中
<view class="buttons"><view v-for="item,index in navTitle" :key="index" @click="btnClick(index)"><view class="text" :class="{activeClass: currentIndex == index}">{{item}}</view></view></view>
2、数据
navTitle: ['一', '二', '三'],currentIndex: 0,
3、方法
btnClick(index) {this.currentIndex = indexconsole.log('btn', this.currentIndex)}
4、样式
.activeClass {// border-bottom: 1px solid blue;border-bottom: 2px solid #3B76FF;// color: #3B76FF;}