这个是效果图
1.在components里面新建一个Breadcrumb.vue的组件代码如下

<template>
    <div class="navbar clearfix">
        <el-breadcrumb class="breadcrumb-container" separator-class="el-icon-arrow-right">
            <el-breadcrumb-item v-for="item in levelList" :key="item.path" :to="item.path">{{item.meta.title}}</el-breadcrumb-item>
        </el-breadcrumb>
    </div>
</template>
 
<script>
    export default {
        name: 'Navbar',
        data() {
            return {
                levelList: []
            }
        },
        watch: {
            $route() {
                this.getBreadcrumb()
            }
        },
        created(){
            this.getBreadcrumb()
        },
        methods:{
            getBreadcrumb() {
                //$route.matched一个数组 包含当前路由的所有嵌套路径片段的路由记录
                let matched = this.$route.matched.filter(item => item.name)
                const first = matched[0];
                if (first && first.name.trim().toLocaleLowerCase() !== '首页'.toLocaleLowerCase()) {
                    matched = [{ path: '/', meta: { title: '首页' }}].concat(matched)
                }
                this.levelList = matched
            }
        }
    }
</script>

2.配置相关的路由
在这个index.js里配置相关的路由部分代码如下

{
    path:'/main',
    name:'Main',
    component:Main,
  },
  {
    path:'/',
    name:'User',
    component:Main,
    meta:{title:'用户'},
    children:[
      //用户
      {
        path:'/users/management',
        name:'Umanagement',
        meta:{title:'用户管理'},
        component:User,
       
      },
      {
        path:'/roles/management',
        name:'Roles',
        component: () => import(/* webpackChunkName: "about" */ '../views/system/Roles.vue'), 
        meta:{title:'角色管理'}
      },
  ]},
      {
        path:'/',
        name:'Product',
        component:Main,
        meta:{title:'商品'},
        children:[ 
      {
        path:'/product/management',
        name:'Pmanagement',
        component:Pmanagement,
        meta:{title:'商品管理'}
      },
      {
        path:'/product/category',
        name:'Category',
        component: () => import(/* webpackChunkName: "about" */ '../views/system/Pcategory.vue'),
        meta:{title:'商品分类'}
      },
      {
        path:'/brands/management',
        name:'Brands',
        component:Brands,
        meta:{title:'品牌管理'}
      },
    ]}

3.最后一步把组件导入主页面，注册组件，并且根据自己的需要导入相应的地方代码如下

<div class="nav">
 <Breadcrumb></Breadcrumb>
 </div>

一步一步操作希望可以帮助到你
4.最后一步当你点击路由切换时可能会出现一个这样的错误
不要担心，也不要着急，跟着图片的操作就可以了

最后一段代码

const originalPush = VueRouter.prototype.push
VueRouter.prototype.push = function push(location) {
  return originalPush.call(this, location).catch(err => err)
}

最后就是希望能够解决大家的问题，我也只是个小白，一起努力，加油！