Vue

<template>
    <div class="nav">
      <div class="nav-a">
        <ul class="nav-a-ul">
            <li class="nav-a-li" :class="classA == index ? 'active' : '' "  @click="selected(index)"  v-for="(item,index) in configNav">
                <router-link :to='item.path' class="nav-a-text" @click="showToggle(index)">{{item.name}}</router-link>
                    <ul class="menu_ul" :class="{'active' :index===isShow}">
                        <li class="menu_li" v-for = "nav in item.subItems" :class="classB == nav ? 'active' : '' "  @click="menuselected(nav)">
                            <router-link class="menu_ul_text" :to="nav.link" :class="{'active':nav.link == linkClick}"  @click = "treeNavSwitch(nav)">{{nav.text}}</router-link>
                        </li>
                    </ul>
            </li>
        </ul>
      </div>
    </div>
</template>


<script>
export default {
  name: "Header",
  data() {
    return {
      show: false,
      classA: 0,
      classB: 0,
      isShow: 0,
      linkClick: "",
     configNav: [
        {
          name: "首页",
          path:'/gwindex',
        },
        {
          name: "产品介绍",
          path:'',
           subItems:[
                        { link:'/education',text: '教学管理系统'},
                        { link:'/yingxiaozhaosheng',text: '营销招生系统' },
                        { link:'',text: '视频直播系统' },
                        { link:'',text: '个性化定制服务' }
                    ]
        },
        {
          name: "渠道合作",
          path:'/partner',
        },
        {
          name: "关于我们",
          path:'/aboutour',
        }
      ]
    }
  },
  methods: {
    selected: function(index) {
      this.classA = index;
    },
     menuselected: function(nav) {
      this.classB = nav;
    },
    showToggle: function(index) {
      this.isShow = index;
    },
    treeNavSwitch: function(nav) {
      this.linkClick = nav.link;
    }
  }
};
</script>

<style scoped>
.nav {
  width: 80%;
  min-width: 1300px;
  height: auto;
  margin: 0px auto;
  position: absolute;
  border-bottom: none;
  line-height: 65px;
}
.nav-a {
  cursor: pointer;
  float: left;
  margin-left: 50px;
  letter-spacing: 4px;
  position: relative;
}
.nav-a-ul {
  list-style: none;
}
.nav-a-li {
  display: inline-block;
  margin-left: 30px;
  height: 60px;
}
.nav-a-text {
  font-size: 14px;
  color: #fff;
  line-height: 58px;
  text-decoration: none;
}
.menu_ul {
  width: 130px;
  list-style: none;
  background: #fff;
  border-radius: 3px;
  z-index: 999;
  position: absolute;
  top: 58px;
  left: 67px;
  display: none;
}
.menu_li {
  height: 30px;
  line-height: 30px;
  padding-left: 12px;
}
.menu_ul_text {
  font-size: 14px;
  color: #666;
  letter-spacing: 0;
  line-height: 30px;
  text-decoration: none;
  padding-left: 6px;
}
.nav-a-li:hover {
  border-bottom: 2px solid #fff;
}
.nav-a-li.active {
  border-bottom: 2px solid #fff;
}
/* .nav-a-li:active {
  border-bottom: 2px solid #fff;
} */
.nav-a-li:hover .menu_ul {
  display: block;
}
.menu_ul_text:hover {
  color: #2589ff;
}
.menu_li.active .menu_ul_text{
    color: #2589ff;
}
</style>