Vue.js & CSS: 创建带悬停下拉菜单的网站导航栏

<template>
  <div class='navbar'>
    <!-- 左侧区域 -->
    <div class='logo'>
      <img src='./logo.png' alt='logo'>
    </div>
    <!-- 右侧区域 -->
    <div class='nav-list'>
      <div class='nav-item' @mouseover='showBox('intro')' @mouseleave='hideBox'>
        <span>简介</span>
        <div class='box' v-show='showIntro'>
          <p>这是简介内容</p>
          <p>这是简介内容</p>
          <p>这是简介内容</p>
          <p>这是简介内容</p>
        </div>
      </div>
      <div class='nav-item' @mouseover='showBox('news')' @mouseleave='hideBox'>
        <span>新闻中心</span>
        <div class='box' v-show='showNews'>
          <p>这是新闻中心内容</p>
          <p>这是新闻中心内容</p>
          <p>这是新闻中心内容</p>
          <p>这是新闻中心内容</p>
        </div>
      </div>
      <div class='nav-item' @mouseover='showBox('rules')' @mouseleave='hideBox'>
        <span>制度公告</span>
        <div class='box' v-show='showRules'>
          <p>这是制度公告内容</p>
          <p>这是制度公告内容</p>
          <p>这是制度公告内容</p>
          <p>这是制度公告内容</p>
        </div>
      </div>
    </div>
  </div>
</template>
<script>
  export default {
    data() {
      return {
        showIntro: false, // 是否显示简介内容
        showNews: false, // 是否显示新闻中心内容
        showRules: false // 是否显示制度公告内容
      };
    },
    methods: {
      // 显示对应的盒子
      showBox(type) {
        switch (type) {
          case 'intro':
            this.showIntro = true;
            break;
          case 'news':
            this.showNews = true;
            break;
          case 'rules':
            this.showRules = true;
            break;
        }
      },
      // 隐藏所有盒子
      hideBox() {
        this.showIntro = false;
        this.showNews = false;
        this.showRules = false;
      }
    }
  };
</script>
<style>
  .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    background-color: #fff;
    height: 60px;
    padding: 0 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.12);
  }
  .logo {
    width: 40%;
  }
  .logo img {
    width: 100%;
  }
  .nav-list {
    width: 60%;
    display: flex;
    justify-content: space-between;
  }
  .nav-item {
    position: relative;
    cursor: pointer;
  }
  .nav-item span {
    font-size: 16px;
  }
  .box {
    position: absolute;
    top: 100%;
    left: 0;
    width: 200px;
    background-color: #fff;
    padding: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.12);
    display: none;
  }
  .box p {
    margin: 0;
    font-size: 14px;
    line-height: 1.5;
  }
  .box p + p {
    margin-top: 10px;
  }
  .box:before {
    content: "";
    position: absolute;
    top: -10px;
    right: 10px;
    border: 5px solid transparent;
    border-bottom-color: #fff;
  }
</style>