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>