vue实现侧边折叠菜单栏手风琴效果

在我们做管理后台亦或是产品流程时，总是需要一个菜单栏或者导航栏来架起我们的产品架构，那么，如何用vue实现侧边折叠导航栏呢？接下来将一一介绍。

                                   请先看效果演示图。

步骤1：先架构整个页面的布局，撰写html、css和js
HTML代码

JS代码

CSS代码

    #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%);
    }

步骤2：撰写完基本网页布局和样式后，对部分细节进行剖析。

1、动态绑定路径

{{it.name}}

2、一级菜单，标题及折叠符号

①通过@mouseenter和@mouseleave事件，当鼠标移入和移出时，改变标题区域背景颜色

②通过@click事件，当鼠标点击时，显示二级菜单列表

③利用:class动态绑定类名，触发active方法，修改折叠符号状态；绑定图标类名，通过遍历，修改对应图标

    

        

            
        
        

            {{item.title}}
        
        

            
        
    
    

        {{it.name}}
    

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';
    }
}

步骤3：菜单栏完成后，在网页端能进行查看，但是还需做一个手机端适配，这样就达到两端同步适应的效果。实现如下：

①对左边导航栏再撰写第二套代码，并绑定好对应的参数实现显示和隐藏

②运用vue已有的transition，绑定name值，实现动画效果绑定

HTML代码

    

        

            

                
            
            
数据中心后台管理
        
        

            

                

                    
                
                

                    {{item.title}}
                
                

                    
                
            
            

                {{it.name}}
            
        
    

JS代码

mounted() {
    window.onresize = () => { //监听屏幕变化
        this.page_width();
    };
    this.page_width();
}，
methods: {
    make_menu() { //点击导航图标
        this.dismenu = !this.dismenu;
    },
    page_width() { //获取屏幕宽度
        var screenWidth = window.screen.width;
        if (screenWidth <= 1024) {
            this.fullWidth = false;
        } else {
            this.fullWidth = true;
        }
    }
}

最后来看下手机端效果：

附上全文代码：

注：

1、css样式中的rem换算成px为对应的rem值*100,如：font-size:0.24rem；=> font-size:24px；

2、文章中涉及到的iconfont类名是因为引用了阿里图标，如遇到不知道如何引用的可以翻阅博文→ https://blog.csdn.net/weixin_44803753/article/details/113423633

3、关于router-link对应的跳转，如有小伙伴不太清楚如何使用vue-router配置路由的可以翻阅博文→https://blog.csdn.net/weixin_44803753/article/details/113436625

Ending(〃'▽'〃)！