解决办法：

1.新建四个或者多个页面（Index.vue,Classify.vue,ShoppCart.vue,My.vue）

2.新建tabbar.vue页面

<template>
    <div id="tab-bar">
        <slot></slot>
    </div>
</template>

<script>
    export default {
        name: 'TabBar'
    }
</script>

<style scoped>
    #tab-bar {
        display: flex;
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: #f6f6f6;
        box-shadow: 0 -1px 1px rgba(100, 100, 100, .1);
    }
</style>

此处为知识链接：

<slot></slot>名叫插槽，在这边主要起到的是占位的作用

3.新建tabbaritem.vue页面

<template>
    <div class="tab-bar-item" @click="itemClick()">
        <div v-if="!isActive">
            <slot name="item-icon"></slot>
        </div>
        <div v-else>
            <slot name="item-icon-active"></slot>
        </div>
        <div :style="activeStyle">
            <slot name="item-text"></slot>
        </div>
    </div>
</template>

<script>
    export default {
        name: 'TabBarItem',
        props: {
            path: String,
            activeColor: {
                type: String,
                default: '#1296db'
            }
        },
        computed: {
            isActive() {
                return this.$route.path.indexOf(this.path) !== -1
            },
            activeStyle() {
                return this.isActive ? {color: this.activeColor} : {}
            }
        },
        methods: {
            itemClick() {
                this.$router.replace(this.path).catch(() => {})
            }
        }
    }
</script>

<style>
    .tab-bar-item {
        flex: 1;
        text-align: center;
        height: 49px;
        font-size: 14px;
    }

    .tab-bar-item img {
        display: inline-block;
        width: 24px;
        height: 24px;
        margin-top: 3px;
        vertical-align: middle;
    }
</style>

4.在App.vue 中实现文件的引用

<template>
  <div id="app">
      <router-view></router-view>
      <tab-bar>
          <tab-bar-item path="/home">
              <img slot="item-icon" src="./assets/img/tabbar/icon_home.png" alt="首页">
              <img slot="item-icon-active" src="./assets/img/tabbar/icon_home_active.png" alt="首页">
              <div slot="item-text">首页</div>
          </tab-bar-item>
          <tab-bar-item path="/classify">
              <img slot="item-icon" src="./assets/img/tabbar/icon_classify.png" alt="分类">
              <img slot="item-icon-active" src="./assets/img/tabbar/icon_classify_active.png" alt="分类">
              <div slot="item-text">分类</div>
          </tab-bar-item>
          <tab-bar-item path="/shopcart">
              <img slot="item-icon" src="./assets/img/tabbar/icon_shopcart.png" alt="购物车">
              <img slot="item-icon-active" src="./assets/img/tabbar/icon_shopcart_active.png" alt="购物车">
              <div slot="item-text">购物车</div>
          </tab-bar-item>
          <tab-bar-item path="/my">
              <img slot="item-icon" src="./assets/img/tabbar/icon_my.png" alt="我的">
              <img slot="item-icon-active" src="./assets/img/tabbar/icon_my_active.png" alt="我的">
              <div slot="item-text">我的</div>
          </tab-bar-item>
      </tab-bar>
  </div>
</template>

<script>
    import TabBar from './components/tabbar/TabBar.vue'
    import TabBarItem from './components/tabbar/TabBarItem.vue'

export default {
  name: 'App',
  components: {
    TabBar,
    TabBarItem
  }
}
</script>

<style></style>

原文链接：Vue实现底部导航