vue的面包屑导航组件

用来将其放到navbar中；

Breadcrumb/index.vue

<template>
   <el-breadcrumb class="app-breadcrumb" separator="/">
     <transition-group>
       <el-breadcrumb-item  v-for="(item,index) in levelList" :key="item.path" v-if="item.meta.title">
         <span   v-if='item.redirect==="noredirect"||index==levelList.length-1' class="no-redirect">{{item.meta.title}}</span>
         <router-link   v-else :to="item.redirect||item.path">{{item.meta.title}}</router-link>
       </el-breadcrumb-item>
     </transition-group>
   </el-breadcrumb>
</template>
<script>
    export default {
        name: "idnex",
      data(){
          return {
            levelList:null
          }
      },
      created() {
        this.getBreadcrumb()
      },
      watch:{
        $route(){
          this.getBreadcrumb()
        }
      },
      methods:{
        getBreadcrumb(){
            let matched=this.$route.matched.filter(item=>item.name)//$route.matched 将会是一个包含从上到下的所有对象 (副本)。
            const first=matched[0]
            if(first && first.name !=='dashboard'){//$route.name当前路由名称  ；$route.redirectedFrom重定向来源的路由的名字
              matched=[{ path: '/dashboard', meta: { title: 'dashboard' }}].concat(matched)
            }
            this.levelList=matched
          }
      }
    }
</script>
<style rel="stylesheet/scss" lang="scss" scoped>
  .app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 14px;
    line-height: 50px;
    margin-left: 10px;
    .no-redirect {
      color: #97a8be;
      cursor: text;
    }
  }
</style>