基于vue-router的matched实现面包屑功能

const routes = [
 //匹配空路由，重定向到根路由
    {
        path:'',
        redirect: '/home',
        meta:{
            showInbreadcrumb:false
        }
    },
    //根路由
    {
        path:'/home',
        component: ()=>import('@/views/layout/index.vue'),
        name:'home',
        meta:{
            title:"首页",
            showInbreadcrumb:true
        }
    },
    //电子数码
    {
        path:'/electronics',
        name:'电子数码',
        component: ()=>import('@/views/layout/index.vue'),
        redirect: '/electronics/computer',
        meta:{
            title:"电子数码",
            showInbreadcrumb:true
        },
        children:[
            {
                path:'computer',
                name:'computer',
                component()=>import('@/views/electronics/children/computer/index.vue'),
                meta:{
                    title:"电脑",
                    showInbreadcrumb:true
                }
            },
            {
                path:'phone',
                name:'手机',
                component: ()=>import('@/views/electronics/children/phone/index.vue'),
                meta:{
                    title:"手机",
                    showInbreadcrumb:true
                }
            },
            {
                path:'tv',
                name:'电视',
                component: ()=>import('@/views/electronics/children/tv/index.vue'),
                meta:{
                    title:"电视",
                    showInbreadcrumb:true
                }
            }
        ]
    },
    //服装鞋帽
    {
        path:'/clothing',
        name:'服装鞋帽',
        component: ()=>import('@/views/layout/index.vue'),
        redirect: '/clothing/tops',
        meta:{
            title:"服装鞋帽",
            showInbreadcrumb:true
        },
        children:[
            {
                path:'tops',
                name:'上装',
                component:  ()=>import('@/views/clothing/children/tops/index.vue'),
                meta:{
                    title:"上装",
                    showInbreadcrumb:true
                }
            },
            {
                path:'lower',
                name:'下装',
                component:  ()=>import('@/views/clothing/children/lower/index.vue'),
                meta:{
                    title:"下装",
                    showInbreadcrumb:true
                }
            },
            {
                path:'shoes',
                name:'鞋子',
                component:  ()=>import('@/views/clothing/children/shoes/index.vue'),
                meta:{
                    title:"鞋子",
                    showInbreadcrumb:true
                }
            }
        ]
    },
    //放在最后，当前面所有路由都没匹配到时，会匹配该路由，并重定向到根路由
    {
        path:'*',
        redirect:'/',
        meta:{
            showInbreadcrumb:false
        } 
    },   
]

///src/views/layout/index.vue
<template>
    <div class="layout">
        <!-- 侧边导航栏 -->
        <div class="sideMenu">
            <el-menu
                default-active="0"
                class="el-menu-vertical-demo"
                >
                    <div v-for="(item,index) in routes" :key="index" :index="index+''">
                        <!-- 没有二级菜单的 -->
                        <el-menu-item :index="index+''" v-if="!item.children">
                            <router-link :to="{name:item.name}">{{item.meta.title}}</router-link>
                        </el-menu-item>
                        <!-- 有二级菜单的 -->
                        <el-submenu :index="index+''" v-else>
                            <template slot="title">{{item.meta.title}}</template>
                            <el-menu-item  v-for="(item_,index_) in item.children" :key="index_" :index="index+'-'+index_">
                                <router-link :to="{name:item_.name}">{{item_.meta.title}}</router-link>
                            </el-menu-item>
                        </el-submenu>
                    </div>
            </el-menu>
        </div>
        <div class="content">
            <!-- 面包屑 -->
            <div class="breadcrumb">
                <el-breadcrumb separator-class="el-icon-arrow-right">
                    <el-breadcrumb-item v-for="(item,index) in breadcrumb" :key="index" :to="{ path: item.path}">{{item.meta.title}}</el-breadcrumb-item>
                </el-breadcrumb>
            </div>
            <!-- 路由出口 -->
            <router-view></router-view>
        </div>
    </div>
</template>

export default {
    data(){
        return{
        }
    },
    computed:{
        // 侧边导航数据
        routes(){
            // 从$router.options中获取所有路由信息并过滤
            return this.$router.options.routes.filter((item)=>{
                return item.meta.showInbreadcrumb
            });
        },
        // 面包屑数据
        breadcrumb(){
            // 根据路由配置meta中的showInbreadcrumb字段过滤
            let matchedArr = this.$route.matched.filter((item)=>{
                return item.meta.showInbreadcrumb}
            );
            // 因为首页比较特殊，必须一直显示在面包屑第一个，如果没有首页路由信息，手动添加到最前面
            if(matchedArr[0].meta.title !== '首页'){
                matchedArr.unshift(
                    {
                        path:'/home',
                        meta:{  
                            title:"首页",
                            showInbreadcrumb:true
                        }
                    },
                )
            }
            return matchedArr;
        },
    }
}