微信小程序动态添加class,事件传参

data-参数名="值" 

bind:tap="事件名称"

<view class="tab-item {{tabIndex=='1' ? 'active' : ''}}" data-tab="1" bind:tap="tabChange">点击</view>

tabChange(event){
    console.log('tabChange', event)
    let tabIndex = event.currentTarget.dataset.tab;
    this.setData({
      tabIndex
    })
  },