目录

一、效果

二、实现

---

一、效果： 

实现功能如图：（只有导航1有数据）

二、实现：  

直接上代码：

<template><div class="menu_all"><!-- 头部导航 --><div class="menu" :key='"menu" + i' v-for='(v, i) in navigationList'
@mouseover="menuOver(v.navigationId)"><p>{{v.navigationName}}</p></div><!-- 下拉子菜单 --><div class="submenu"><div class="sub_left"><ul ref="pClassList" v-for="(item,index) in currSub" v-bind:key="index" @mouseover="mouseOver(index)" :class="{'active':index===value}"><li><a href="#" @mouseover="mouseOver(index)" :class="{'active':index===value}">{{ item.classifyName }}</a></li></ul></div><div class="sub_right" v-if="show>-1 && currSub[show]"><ul><li ref="proList" v-for="itemChild in currSub[show].tools" v-bind:key="itemChild.id"><a :href="itemChild.toolUrl"><div class="sub_text"><h4>{{ itemChild.toolName}}</h4><h6>{{ itemChild.owner }}</h6><p>{{ itemChild.introduction }}</p></div></a></li></ul></div></div></div>
</template><script>
export default {name: 'NavDown',data: function () {return {menuId: null,show: 0,value: 0,active: '',navigationList: [{'navigationId': 1,'navigationName': '导航1','sorted': 1},{'navigationId': 2,'navigationName': '导航2','sorted': 2},{'navigationId': 3,'navigationName': '导航3','sorted': 3},{'navigationId': 4,'navigationName': '导航4','sorted': 4}],proClassify: [{'classify': [{'classifyId': 1,'classifyName': '分类1','tools': [{'classifyId': 1,'createTime': 1626327646000,'creator': 9956,'env': 'COMMON','id': 1,'introduction': '产品1简介','isValid': 1,'owner': 0000,'toolName': '产品1','toolUrl': 'http://www.baidu.com','updateTime': 1626334554000}]},{'classifyId': 2,'classifyName': '分类2','tools': [{'classifyId': 2,'createTime': 1626335332000,'creator': 9956,'env': 'COMMON','id': 2,'introduction': '产品2简介','isValid': 1,'owner': 0000,'toolName': '产品2','toolUrl': 'http://www.bilibili.com','updateTime': 1626335332000}]}],'navigationId': 1},{'classify': [],'navigationId': 2},{'classify': [],'navigationId': 4},{'classify': [],'navigationId': 5}]}},
// 根据导航id，提取对应classify数据computed: {subMap () {let menu = {}this.proClassify.map(v => {menu[v.navigationId] = v.classify || []})return menu || {}},currSub () {return this.subMap[this.menuId] || []}},methods: {mouseOver (i) {this.value = ithis.show = i},menuOver (id) {this.menuId = id}}
}
</script><style scoped>
.menu {display: inline-block;margin-left: 20px;height: 66px;color: black;line-height: 66px;
}
.menu p {font-size: 16px;text-align: center;line-height: 68px;
}
.menu ul li a.active {background-color: white;
}
.menu ul li a:hover {color: #ff7240;
}
.menu-item:hover + .submenu {display: block;
}/*下拉子菜单*/
.submenu {display: none;position: absolute;width: 100%;height: 450%;background-color: white;z-index: 999;
}
.sub_left {float: left;margin-left: 3%;margin-top: 1%;margin-bottom: 1%;width: 20%;height: 90%;overflow: auto;
}
.sub_left::-webkit-scrollbar {display: none;
}
.sub_left ul {padding-left: 2%;width: 70%;margin-left: 25%;border-right: 1px solid #9c9c9c;
}
.sub_left ul:hover {border-right: 3px solid #ff7240;border-collapse: collapse;color: white;
}
.sub_left ul.active {border-right: 3px solid #ff7240;
}
.sub_left ul li {list-style-type: none;line-height: 400%;
}
.sub_left ul li a {display: block;font-size: 16px;text-decoration: none;color: black;display: -webkit-box;-webkit-box-orient: vertical;-webkit-line-clamp: 1;overflow: hidden;
}
.sub_left ul li a:hover {color: #ff7240;
}
.sub_left ul li a.active {color: #ff7240;
}
.sub_left:hover .sub_right {display: block;
}
.sub_right {float: right;width: 70%;height: 86%;overflow: auto;margin-top: 1%;margin-right: 5%;
}
.sub_right::-webkit-scrollbar {display: none;
}
.sub_right ul {display: inline;
}
.sub_right ul li {display: inline-block;vertical-align: top;list-style-type: none;position: relative;float: left;margin-bottom: 5%;margin-right: 5%;width: 20%;height: 10%;
}
.sub_right ul li:last-child {margin-right: 0;
}
.sub_text a {text-decoration: none;
}
.sub_left:hover + .sub_right {display: block;
}
.sub_text {width: 100%;height: 250%;float: left;list-style-type: none;padding: 4% 10% 4% 10%;line-height: 30px;
}
.sub_text:hover {background-color: rgba(255, 158, 91, 0.41);border-radius: 4px;
}
.sub_text h4 {width: 70%;float: left;color: black;display: -webkit-box;-webkit-box-orient: vertical;-webkit-line-clamp: 1;overflow: hidden;text-align: left;font-size: 16px;margin-top: -2%;
}
.sub_text h6 {width: 30%;float: right;color: #000;display: -webkit-box;-webkit-box-orient: vertical;-webkit-line-clamp: 1;overflow: hidden;text-align: right;font-size: 14px;margin-top: -2%;
}
.sub_text p {float: left;width: 100%;color: #8a96a7;display: inline-block;vertical-align: top;text-align: left;display: -webkit-box;-webkit-box-orient: vertical;-webkit-line-clamp: 2;overflow: hidden;font-size: 14px;line-height: 20px;
}/*下拉子菜单悬停出现*/
.menu_all:hover .submenu {display: block;
}
</style>

代码可能有冗余未删除，若代码有误或可以改进，欢迎指正！