在我們做管理后臺亦或是產品流程時，總是需要一個菜單欄或者導航欄來架起我們的產品架構，那么，如何用vue實現側邊折疊導航欄呢？接下來將一一介紹。

? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?請先看效果演示圖。

步驟1：先架構整個頁面的布局，撰寫html、css和js
HTML代碼

<template><div id="main"><div class="content"><!-- 左邊導航欄 --><div class="admin_nav col-lg-3 col-xl-2" v-show="fullWidth"><div class = "admin_nav_site"><div class="title">數據中心后臺管理</div><ul v-for="(item,index) in navList" :key="index"><li @click="handleToTitle(index,item)" @mouseenter="changeTitleColor(index)" @mouseleave="removeTitleColor(index)"ref="title" :class="{active:currentSort == index}" class="col-lg-12"><div class="left_icon"><i :class="'iconfont '+item.className"></i></div><div class="middle">{{item.title}}</div><div class="right_icon"><i :class="'iconfont '+item.close"></i></div></li><li v-for="(it,idx) in item.secMenu" :key="idx" v-show="item.isSubShow" class="active1"><router-link :to="it.path" tag="a">{{it.name}}</router-link></li></ul></div></div><!-- 右邊內容 --><div class="admin_content col-12 col-md-12 col-lg-12 col-xl-10"><div class="admin_header"><!-- 導航圖標 --><div class="H5_item" v-show="!fullWidth"><i class="iconfont icon-daohanglan" @click="make_menu" class-name="H5-menu"></i></div><div class="user"><div class="userHead"><span><img src="../../assets/image/userhead.svg"></span><span>admin</span></div><div class="logOut"><i class="iconfont icon-tuichu"></i></div></div></div><div class="admin_body"><keep-alive><router-view /></keep-alive></div></div></div></div> </template>

JS代碼

<script>import axios from 'axios';export default {name: 'navigation',data() {return {navList: [{title: '用戶管理',isSubShow: false,className: 'icon-guanliyuan1',close: 'icon-close',up: 'icon-zhedie',secMenu: [{name: '工號管理',path: '/home/navigation-one/user'}, // {// name: '角色管理',// path: '/home/navigation-one/role'// }, // {// name: '權限管理',// path: '/home/navigation-one/user'// }, ]},{title: '資源管理',isSubShow: false,className: 'icon-ziyuan',close: 'icon-close',up: 'icon-zhedie',secMenu: [{name: '我的收藏',path: '/home/navigation-one/user'},{name: '我的項目',path: '/home/navigation-one/role'}]},{title: '綜合管理',isSubShow: false,className: 'icon-zonghe',close: 'icon-close',up: 'icon-zhedie',secMenu: [{name: '劃配管理',path: '/home/navigation-one/user'},{name: '數據信息',path: '/home/navigation-one/role'}]},{title: '系統消息',isSubShow: false,className: 'icon-xiaoxi',close: 'icon-close',up: 'icon-zhedie',secMenu: [{name: '實時動態',path: '/home/navigation-one/user'},{name: '過去動態',path: '/home/navigation-one/role'}]}],currentSort: 0,pagetype: "index",fullWidth: true,dismenu: true}},methods: {active(index) {this.currentSort = index;},changeTitleColor(index) {this.currentSort = index;},removeTitleColor(index) {this.currentSort = null;},handleToTitle(ind, item) {this.navList[ind].isSubShow = !this.navList[ind].isSubShow;if (this.navList[ind].isSubShow == true) {this.navList[ind].close = 'icon-zhedie';} else {this.navList[ind].close = 'icon-close';}}}} </script>

CSS代碼

#main {background: #F0F6FF;font-size: 0.16rem;}#main .content {display: flex;flex-direction: row;}.content .admin_nav {min-height: 9.37rem;max-height: 1.3rem;padding: 0 !important;background: #364150;position: relative;}.content .admin_nav .admin_nav_site{height: 100vh;}.content .admin_nav .title {height: 1.39rem;line-height: 1.39rem;background: rgba(63, 73, 86, 1);color: #FFFFFF;text-align: center;font-size: 0.18rem;display: flex;justify-content: center;}.content .admin_nav .title div {padding: 0 0.03rem;}.content .admin_nav .title div:first-child i {font-size: 0.18rem;}.content .admin_nav ul .active {background: rgba(68, 81, 99, 1);}.content .admin_nav ul .active1 a.router-link-active {color: #fff;}.content .admin_nav ul li {height: 0.6rem;display: flex;flex-direction: column;justify-content: center;align-items: center;font-size: 0.18rem;}.content .admin_nav ul li a {color: #cecdc5;cursor: pointer;}.content .admin_nav ul li:first-child {font-size: 0.2rem;height: 0.64rem;display: flex;flex-direction: row;align-items: center;color: #BEC5C0;cursor: pointer;}.content .admin_nav ul li:first-child div {width: 100%;height: 100%;display: flex;justify-content: center;align-items: center;color: #BEC5C0;}.content .admin_nav ul li:first-child .left_icon {width: 22%;}.content .admin_nav ul li:first-child .left_icon i {color: #1296DB;}.content .admin_nav ul li:first-child .middle {width: 56%;display: flex;justify-content: flex-start;}.content .admin_nav ul li:first-child .right_icon {width: 22%;}.admin_nav .admin .middle:hover {color: #fff;}.admin_nav .admin .right_icon i:hover {color: #fff;}.admin_nav .admin .middle.router-link-active {color: #fff;}.content .admin_nav_position {position: absolute;z-index: 3000;}.content .admin_content {padding: 0 !important;}.content .admin_content .admin_header {width: 100%;height: 0.6rem;background: #364150;display: flex;flex-direction: row;align-items: center;justify-content: space-between;}.content .admin_content .admin_header .H5_item {width: 0.4rem;height: 0.4rem;border-radius: 0.2rem;display: flex;justify-content: center;align-items: center;margin-left: 0.2rem;}.content .admin_content .admin_header .H5_item i {font-size: 0.22rem;color: #fff;}.content .admin_content .admin_header .user {width: 100%;display: flex;align-items: center;justify-content: flex-end;}.content .admin_content .admin_header .user .userHead {height: 0.6rem;display: flex;flex-direction: row;align-items: center;color: #fff;font-size: 0.18rem;}.content .admin_content .admin_header .user .userHead span {padding: 0 0.05rem;}.content .admin_content .admin_header .user .userHead span:nth-child(1) {position: relative;}.content .admin_content .admin_header .user .userHead span img {width: 0.4rem;height: 0.4rem;border-radius: 50%;}.content .admin_content .admin_header .user .userHead span input {width: 0.4rem;height: 0.4rem;position: absolute;overflow: hidden;opacity: 0;cursor: pointer;}.content .admin_content .admin_header .user .logOut {color: #fff;margin-left: 0.12rem;margin-right: 0.5rem;}.content .admin_content .admin_header .user .logOut i {color: #1296DB;font-size: 0.24rem;cursor: pointer;}.toggle-cart-enter-active {transition: all 0.4s linear;}.toggle-cart-leave-active {transition: all 0.4s linear;}.toggle-cart-enter {transform: translateX(-200%);}.toggle-cart-leave-active {transform: translateX(-200%);}

?

步驟2：撰寫完基本網頁布局和樣式后，對部分細節進行剖析。

1、動態綁定路徑

<router-link :to="it.path" tag="a">{{it.name}}</router-link>

2、一級菜單，標題及折疊符號

①通過@mouseenter和@mouseleave事件，當鼠標移入和移出時，改變標題區域背景顏色

②通過@click事件，當鼠標點擊時，顯示二級菜單列表

③利用:class動態綁定類名，觸發active方法，修改折疊符號狀態；綁定圖標類名，通過遍歷，修改對應圖標

<ul v-for="(item,index) in navList" :key="index"><li @click="handleToTitle(index,item)" @mouseenter="changeTitleColor(index)" @mouseleave="removeTitleColor(index)" ref="title" :class="{active:currentSort == index}" class="col-lg-12"><div class="left_icon"><i :class="'iconfont '+item.className"></i></div><div class="middle">{{item.title}}</div><div class="right_icon"><i :class="'iconfont '+item.close"></i></div></li><li v-for="(it,idx) in item.secMenu" :key="idx" v-show="item.isSubShow" class="active1"><router-link :to="it.path" tag="a">{{it.name}}</router-link></li> </ul> active(index) {this.currentSort = index; },changeTitleColor(index) {this.currentSort = index; },removeTitleColor(index) {this.currentSort = null; },handleToTitle(ind, item) {this.navList[ind].isSubShow = !this.navList[ind].isSubShow;if (this.navList[ind].isSubShow == true) {this.navList[ind].close = 'icon-zhedie';} else {this.navList[ind].close = 'icon-close';} }

步驟3：菜單欄完成后，在網頁端能進行查看，但是還需做一個手機端適配，這樣就達到兩端同步適應的效果。實現如下：

①對左邊導航欄再撰寫第二套代碼，并綁定好對應的參數實現顯示和隱藏

②運用vue已有的transition，綁定name值，實現動畫效果綁定

HTML代碼

<!-- 移動端導航欄 --> <transition name="toggle-cart"><div class="admin_nav admin_nav_position col-8 col-md-5 col-lg-3 col-xl-3" v-show="!fullWidth&&!dismenu"><div class="title"><div v-show="!fullWidth"><i class="iconfont icon-daohanglan" @click="make_menu" class-name="H5-menu"></i></div><div>數據中心后臺管理</div></div><ul v-for="(item,index) in navList" :key="index"><li @click="handleToTitle(index,item)" @mouseenter="changeTitleColor(index)" @mouseleave="removeTitleColor(index)" ref="title" :class="{active:currentSort == index}"><div class="left_icon"><i :class="'iconfont '+item.className"></i></div><div class="middle">{{item.title}}</div><div class="right_icon"><i :class="'iconfont '+item.close"></i></div></li><li v-for="(it,idx) in item.secMenu" :key="idx" v-show="item.isSubShow" class="active1"><router-link :to="it.path" tag="a">{{it.name}}</router-link></li></ul></div> </transition>

JS代碼

mounted() {window.onresize = () => { //監聽屏幕變化this.page_width();};this.page_width(); }， methods: {make_menu() { //點擊導航圖標this.dismenu = !this.dismenu;},page_width() { //獲取屏幕寬度var screenWidth = window.screen.width;if (screenWidth <= 1024) {this.fullWidth = false;} else {this.fullWidth = true;}} }

最后來看下手機端效果：

附上全文代碼：

<template><div id="main"><div class="content"><!-- 左邊導航欄 --><div class="admin_nav col-lg-3 col-xl-2" v-show="fullWidth"><div class = "admin_nav_site"><div class="title">數據中心后臺管理</div><ul v-for="(item,index) in navList" :key="index"><li @click="handleToTitle(index,item)" @mouseenter="changeTitleColor(index)" @mouseleave="removeTitleColor(index)" ref="title" :class="{active:currentSort == index}" class="col-lg-12"><div class="left_icon"><i :class="'iconfont '+item.className"></i></div><div class="middle">{{item.title}}</div><div class="right_icon"><i :class="'iconfont '+item.close"></i></div></li><li v-for="(it,idx) in item.secMenu" :key="idx" v-show="item.isSubShow" class="active1"><router-link :to="it.path" tag="a">{{it.name}}</router-link></li></ul></div><!-- 管理員端 --><!-- <ul class="admin"><li class="col-lg-12"><div class="left_icon"><i class="iconfont icon-guanliyuan1"></i></div><router-link to="/admin/administrator/secadmin" tag="div" class="middle">管理員端</router-link><div class="right_icon"><i class="iconfont icon-jinru"></i></div></li></ul> --></div><!-- 右邊內容 --><div class="admin_content col-12 col-md-12 col-lg-12 col-xl-10"><div class="admin_header"><!-- 導航圖標 --><div class="H5_item" v-show="!fullWidth"><i class="iconfont icon-daohanglan" @click="make_menu" class-name="H5-menu"></i></div><div class="user"><div class="userHead"><span><img src="../../assets/image/userhead.svg"></span><span>admin</span></div><div class="logOut"><i class="iconfont icon-tuichu"></i></div></div></div><div class="admin_body"><keep-alive><router-view /></keep-alive></div></div><!-- 移動端導航欄 --><transition name="toggle-cart"><div class="admin_nav admin_nav_position col-8 col-md-5 col-lg-3 col-xl-3" v-show="!fullWidth&&!dismenu"><div class="title"><div v-show="!fullWidth"><i class="iconfont icon-daohanglan" @click="make_menu" class-name="H5-menu"></i></div><div>數據中心后臺管理</div></div><ul v-for="(item,index) in navList" :key="index"><li @click="handleToTitle(index,item)" @mouseenter="changeTitleColor(index)" @mouseleave="removeTitleColor(index)"ref="title" :class="{active:currentSort == index}"><div class="left_icon"><i :class="'iconfont '+item.className"></i></div><div class="middle">{{item.title}}</div><div class="right_icon"><i :class="'iconfont '+item.close"></i></div></li><li v-for="(it,idx) in item.secMenu" :key="idx" v-show="item.isSubShow" class="active1"><router-link :to="it.path" tag="a">{{it.name}}</router-link></li></ul></div></transition></div></div> </template><script>import axios from 'axios';export default {name: 'navigation-1',data() {return {token: '',navList: [{title: '用戶管理',isSubShow: false,className: 'icon-guanliyuan1',close: 'icon-close',up: 'icon-zhedie',secMenu: [{name: '工號管理',path: '/home/navigation-one/user'}, // {// name: '角色管理',// path: '/home/navigation-one/role'// }, // {// name: '權限管理',// path: '/home/navigation-one/user'// }, ]},{title: '資源管理',isSubShow: false,className: 'icon-ziyuan',close: 'icon-close',up: 'icon-zhedie',secMenu: [{name: '我的收藏',path: '/home/navigation-one/user'},{name: '我的項目',path: '/home/navigation-one/role'}]},{title: '綜合管理',isSubShow: false,className: 'icon-zonghe',close: 'icon-close',up: 'icon-zhedie',secMenu: [{name: '劃配管理',path: '/home/navigation-one/user'},{name: '數據信息',path: '/home/navigation-one/role'}]},{title: '系統消息',isSubShow: false,className: 'icon-xiaoxi',close: 'icon-close',up: 'icon-zhedie',secMenu: [{name: '實時動態',path: '/home/navigation-one/user'},{name: '過去動態',path: '/home/navigation-one/role'}]}],currentSort: 0,pagetype: "index",fullWidth: true,dismenu: true}},mounted() {window.onresize = () => { //監聽屏幕變化this.page_width();};this.page_width();},methods: {active(index) {this.currentSort = index;},changeTitleColor(index) {this.currentSort = index;},removeTitleColor(index) {this.currentSort = null;},handleToTitle(ind, item) {this.navList[ind].isSubShow = !this.navList[ind].isSubShow;if (this.navList[ind].isSubShow == true) {this.navList[ind].close = 'icon-zhedie';} else {this.navList[ind].close = 'icon-close';}},make_menu() { //點擊導航圖標this.dismenu = !this.dismenu;},page_width() { //獲取屏幕寬度var screenWidth = window.screen.width;if (screenWidth <= 1024) {this.fullWidth = false;} else {this.fullWidth = true;}}}} </script><style scoped>#main {background: #F0F6FF;font-size: 0.16rem;}#main .content {display: flex;flex-direction: row;}.content .admin_nav {min-height: 9.37rem;max-height: 1.3rem;padding: 0 !important;background: #364150;position: relative;}.content .admin_nav .admin_nav_site{height: 100vh;}.content .admin_nav .title {height: 1.39rem;line-height: 1.39rem;background: rgba(63, 73, 86, 1);color: #FFFFFF;text-align: center;font-size: 0.18rem;display: flex;justify-content: center;}.content .admin_nav .title div {padding: 0 0.03rem;}.content .admin_nav .title div:first-child i {font-size: 0.18rem;}.content .admin_nav ul .active {background: rgba(68, 81, 99, 1);}.content .admin_nav ul .active1 a.router-link-active {color: #fff;}.content .admin_nav ul li {height: 0.6rem;display: flex;flex-direction: column;justify-content: center;align-items: center;font-size: 0.18rem;}.content .admin_nav ul li a {color: #cecdc5;cursor: pointer;}.content .admin_nav ul li:first-child {font-size: 0.2rem;height: 0.64rem;display: flex;flex-direction: row;align-items: center;color: #BEC5C0;cursor: pointer;}.content .admin_nav ul li:first-child div {width: 100%;height: 100%;display: flex;justify-content: center;align-items: center;color: #BEC5C0;}.content .admin_nav ul li:first-child .left_icon {width: 22%;}.content .admin_nav ul li:first-child .left_icon i {color: #1296DB;}.content .admin_nav ul li:first-child .middle {width: 56%;display: flex;justify-content: flex-start;}.content .admin_nav ul li:first-child .right_icon {width: 22%;}.admin_nav .admin .middle:hover {color: #fff;}.admin_nav .admin .right_icon i:hover {color: #fff;}.admin_nav .admin .middle.router-link-active {color: #fff;}.content .admin_nav_position {position: absolute;z-index: 3000;}.content .admin_content {padding: 0 !important;}.content .admin_content .admin_header {width: 100%;height: 0.6rem;background: #364150;display: flex;flex-direction: row;align-items: center;justify-content: space-between;}.content .admin_content .admin_header .H5_item {width: 0.4rem;height: 0.4rem;border-radius: 0.2rem;display: flex;justify-content: center;align-items: center;margin-left: 0.2rem;}.content .admin_content .admin_header .H5_item i {font-size: 0.22rem;color: #fff;}.content .admin_content .admin_header .user {width: 100%;display: flex;align-items: center;justify-content: flex-end;}.content .admin_content .admin_header .user .userHead {height: 0.6rem;display: flex;flex-direction: row;align-items: center;color: #fff;font-size: 0.18rem;}.content .admin_content .admin_header .user .userHead span {padding: 0 0.05rem;}.content .admin_content .admin_header .user .userHead span:nth-child(1) {position: relative;}.content .admin_content .admin_header .user .userHead span img {width: 0.4rem;height: 0.4rem;border-radius: 50%;}.content .admin_content .admin_header .user .userHead span input {width: 0.4rem;height: 0.4rem;position: absolute;overflow: hidden;opacity: 0;cursor: pointer;}.content .admin_content .admin_header .user .logOut {color: #fff;margin-left: 0.12rem;margin-right: 0.5rem;}.content .admin_content .admin_header .user .logOut i {color: #1296DB;font-size: 0.24rem;cursor: pointer;}.toggle-cart-enter-active {transition: all 0.4s linear;}.toggle-cart-leave-active {transition: all 0.4s linear;}.toggle-cart-enter {transform: translateX(-200%);}.toggle-cart-leave-active {transform: translateX(-200%);} </style>

注：

1、css樣式中的rem換算成px為對應的rem值*100,如：font-size:0.24rem；=>??font-size:24px；

2、文章中涉及到的iconfont類名是因為引用了阿里圖標，如遇到不知道如何引用的可以翻閱博文→?https://blog.csdn.net/weixin_44803753/article/details/113423633

3、關于router-link對應的跳轉，如有小伙伴不太清楚如何使用vue-router配置路由的可以翻閱博文→https://blog.csdn.net/weixin_44803753/article/details/113436625

Ending(〃'▽'〃)！

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