<div class="col-lg-3 col-xs-6 paddingLeft com_marginBtm10 choosePlan" v-on:mouseover="changeActive($event)" v-on:mouseout="removeActive($event)">  流量套餐</div>

methods:{   changeActive($event){       $event.currentTarget.className="col-lg-3 col-xs-6 paddingLeft com_marginBtm10 choosePlan active";   },   removeActive($event){       $event.currentTarget.className="col-lg-3 col-xs-6 paddingLeft com_marginBtm10 choosePlan";   }},

    <div class="index_tableTitle clearfix" v-for="(item,index) in table_tit">     <div class="indexItem">      <span :title="item.name">{{item.name}}</span>      <span class="mypor">       <i class="icon" @mouseenter="enter(index)" @mouseleave="leave()"></i>       <div v-show="seen&&index==current" class="index-show">        <div class="tip_Wrapinner">{{item.det}}</div>       </div>      </span>     </div>    </div>

 export default {  data(){   return{    seen:false,    current:0   }  },  methods:{   enter(index){    this.seen = true;    this.current = index;   },   leave(){    this.seen = false;    this.current = null;   }  } }