导航栏 CSS样式分析

 示例代码：

<template>
  <div class="tab-control">
    <div v-for="(item,index) in titles" :key="item" @click="tabchang(index)"
         class="tab-control-item" :class="{active: (index == p_index)}">
      <span>{{item}}</span>
    </div>
  </div>
</template>
<script>
  export default {
    name: "TabControl",
    props: {
      titles: {
        type: Array,
        default() {
          return []
        }
      }
    },
    data() {
      return {
        p_index: 0
      }
    },
    methods: {
      tabchang(index) {
        this.p_index=index
      }
    }

  }
</script>
<style>
  /*父样式*/
  .tab-control {
    display: flex;
    text-align: center;

    height: 44px;
    line-height: 44px;
    font-size: 15px;
    background-color: #ffffff;
    position: sticky;
    top: 44px;
  }
  /*子样式*/
  .tab-control-item {
    flex: 1;
  }
  .tab-control-item span {
    padding: 5px;
  }

  .active {
    color: var(--color-high-text);
  }
  .active span {
    border-bottom: 3px solid var(--color-high-text);

  }

</style>