Vant的Tabbar标签栏引入自定义图标方式

*van-tabbar-item*每一个Tab标签
#icons  自定义图标的插槽
props.active   插槽的值，点击后为true，初始为false

<van-tabbar v-model="active" active-color="#42A46F" inactive-color="#999999" @change="onChange" route>
<van-tabbar-item to="/myorder">
                <span>我的预约</span>
                <template #icon="props">
                    <van-image :src="props.active ? require('@mobile/assets/images/index/aftericon1.png') : require('@mobile/assets/images/index/icon1.png')" />
                </template>
            </van-tabbar-item>
</van-tabbar>

<template>
  <div class="app-container">
    <div class="layout-content">
      <keep-alive>
        <router-view v-if="$route.meta.keepAlive" style="margin-bottom: 50px"/>
      </keep-alive>
      <router-view v-if="!$route.meta.keepAlive" style=" margin-bottom: 50px"/>
    </div>
    <!--    底部导航组件   -->
    <div class="layout-footer">
      <TabBar :data="tabbars" @change="handleChange"/>
    </div>
  </div>
</template>

<script>
import TabBar from '@/components/TabBar'
export default {
  name: 'Home',
  computed: {
    key() {
      return this.$route.path
    }
  },
  data() {
    return {
      pic: '@src/assets/images/home-black.png',
      cachedViews: 'Home',
      tabbars: [
        {
          title: '首页',
          to: {
            name: 'Home'
          },
          nORMal: require("../../src/assets/images/home_black.png"),
          active: require("../../src/assets/images/home_selected.png")
        },
        {
          title: '模块',
          to: {
            name: 'Model'
          },
          normal: require("../../src/assets/images/model_black.png"),
          active: require("../../src/assets/images/model_selected.png")
        },
        {
          title: '关于我',
          to: {
            name: 'Mine'
          },
          normal: require("../../src/assets/images/mine_black.png"),
          active: require("../../src/assets/images/mine_selected.png")
        }
      ]
    }
  },
  components: {
    TabBar
  },
  methods: {
    handleChange(v) {
      console.log('tab value:', v)
    }
  }
}
</script>

<template>
  <div>
    <van-tabbar fixed route v-model="active" @change="handleChange">
      <van-tabbar-item v-for="(item, index) in data" :to="item.to" :icon="item.icon" :key="index">
        <span :class="defaultActive === index ? active:''">{{ item.title }}</span>
        <template slot="icon" slot-scope="props">
          <img :src="props.active ? item.active : item.normal">
        </template>
      </van-tabbar-item>
    </van-tabbar>
  </div>
</template>

<script>
export default {
  name: 'TabBar',
  props: {
    defaultActive: {
      type: Number,
      default: 0
    },
    data: {
      type: Array,
      default: () => {
        return []
      }
    }
  },
  data() {
    return {
      active: this.defaultActive
    }
  },
  methods: {
    handleChange(value) {
      this.$emit('change', value)
    }
  }
}
</script>

<style scoped>
.active_tab img {
  width: 26px;
  height: 26px;
}

.van-tabbar-item--active {
  color: #d81e06;
}
</style>