fix levelbar bug

src/views/layout/Levelbar.vue

 <template>
   <el-breadcrumb class="app-levelbar" separator="/">
     <el-breadcrumb-item v-for="(item,index)  in levelList" :key="item.path">
-      <router-link v-if='item.redirect==="noredirect"||index==levelList.length-1' to="" class="no-redirect">{{item.name}}</router-link>
+      <span v-if='item.redirect==="noredirect"||index==levelList.length-1' class="no-redirect">{{item.name}}</span>
       <router-link v-else :to="item.redirect||item.path">{{item.name}}</router-link>
     </el-breadcrumb-item>
   </el-breadcrumb>