I did this.

<!-- App.vue HTML 部分 -->
<li v-for = "(tab, index) in tabs" :key="index" class="nav-link" @click="active_tab = tab" v-bind:class="{ 'active' : tab === active_tab }">
    ...
</li>

I added all the tabs I wanted in an array called tabs.

<script>

export default {
  name: 'Home',

  data() {
    return {
      active_tab: "Tab1",
      tabs: ["Tab1", "Tab2", "Tab3"]
    }
}

</script>

This will create a <li> element for each tab in the array tabs.

All elements will have the nav-link class, and use v-bind, if the variable active_tab is equal to tab, will add active to the element's class list. Whenever the user clicks one of the tabs, use @click to change the active_tab to the tab that the user clicked.

style

.nav-link {
    background-color: var(--primary-color);
    /* 正常时元素的外观 */
}
.nav-link.active {
    background-color: var(--hover-color);
    /* 当元素处于活动状态时 */
}