关于vue.js:vue选项卡

<template v-if="!isLogin">
         <template id="onCh">
              <div v-for="(item, index) in rightMenu" :key="index" @click="addClass(index)" v-bind:class="{ischeck: index == current}">
                      <router-link class="oneli icobtn" :to="{path:item.path}" exact v-if="item.ico" >
                               <img :src="item.ico" alt="" />
                               <span>111{{item.title}}</span>
                      </router-link>
                      <router-link class="oneli rigisterbtn" :to="{path:item.path}" exact v-else>
                               <span>222{{item.title}}</span>
                      </router-link>
              </div>
         </template>
</template>

addClass(index) {
      // var cun = sessionStorage.name = index;
      // console.log("cun",cun);
      // var na = sessionStorage.getItem("name",index);
      // console.log("na",na);
      this.current = na;
      
},