vue中的router-link导航栏刷新，选中样式不修改

<router-link
      v-for="(item,index) in listed"
      :key="item.value"
      :to="{path:item.path,query:{item:index}}"
      :class="{'router-link-exact-active':ind == index}"
      @click.native="changeBgc(index)"
      class="topbar-item"
    >{{item.label}}</router-link>

data() {
    return {
      listed: [
        {path: '/data-source', label: '数据源'},
        {path: '/data-set', label: '数据集'},
        {path: '/datas-area', label: '资源区'},
        {path: '/instruments-panel', label: '仪表盘'},
        {path: '/publish', label: '发布区'}
      ],
      ind: '0'
    };
  },


// 点击nav 给当前nav添加状态
 methods: {
	changeBgc(index) {
	      this.ind = index;
	    },
	}

mounted() {
    if (this.$route.query.item) {
      this.ind = this.$route.query.item;
    } else {
      this.ind = 0;
    }
  }