vant报错：Unknown custom element: ＜van-tabbar＞

Unknown custom element: - did you register the component correctly? For recursive components, make sure to provide the “name” option.

found in

—> at src/views/layout/index.vue
at src/App.vue

在使用vant的组件Tabbar, TabbarItem的时候报错，因为插件使用方式写错了
错的时候这样写的

import Vue from 'vue'
import { Button, Tabbar, TabbarItem } from 'vant'

Vue.use(Button, Tabbar, TabbarItem)

实际上应该和下面写的一样

Vue.use(Button).use(Tabbar).use(TabbarItem)

底部标签就出来了