项目演示结果： 

项目结构：

 

项目代码

1.index.vue

<template>
  <div id="app">
   
    <tabs :currentIndex="currentIndex" @changTab="changeTabHandler">
      <tab tabName="tab1" index="1">
        <div>内容1</div>
      </tab>
      <tab tabName="tab2" index="2">
        <div>内容2</div>
      </tab>
      <tab tabName="tab3" index="3">
        <h3>内容3</h3>
      </tab>
    </tabs>
  </div>
</template>

<script>
import tabs from '@/components/tabs/tabs.vue'; 
import tab from '@/components/tabs/tab.vue'; 
export default {
  
  data(){
    return{
      currentIndex:"1"
    }
  },
  components: {
	  tabs,
	  tab,
  },
  methods:{
    changeTabHandler(index){
      this.currentIndex = index;
    }
  }
}
</script>
<style>
#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>

 2.tabs.vue

<script>

import Content from "./content.vue"

export default {
    name:"Tabs",
    data(){
        return{
            panes:[]
        }
    },
    props:{
        currentIndex:{
            type:[String,Number],
            default:"1"
        }
    },
    methods:{
        onChangeIndex(index){
            this.$emit("changTab",index);
        }
    },
    render(){
        return(
            <div>
                <ul class="tabs-header">
                    { this.$slots.default }
                </ul>
                <Content panes={ this.panes }/>
            </div>
        )
    }
}
</script>

<style scoped>

.tabs-header {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  border-bottom: 2px solid #ededed;
}


</style>

3.tab.vue

<script>
export default {
    name:"Tab",
    props:{
        index:{
            type:[String,Number],
            default:"1"
        },
        tabName:{
            type:String,
            default:"tab"
        }
    },
    mounted() {
        this.$parent.panes.push(this);
    },
    computed:{
        active(){
            return this.$parent.currentIndex == this.index
        }
    },
    methods:{
        changeIndexHandler(){
            // 把数据传递给父元素
            // this.$emit("onChangeIndex",this.index);
            this.$parent.onChangeIndex(this.index);
        }
    },
    render(){
        let className = {
            tab:"tab",
            active:this.active
        }
        return(
            <li onClick={ this.changeIndexHandler.bind(this) } class={ className }>{ this.tabName }</li>
        )
    }
}
</script>
<style scoped>

.tab {
    flex:1;
    list-style: none;
    line-height: 40px;
    margin-right: 30px;
    position: relative;
    text-align:center;
}

.tab.active {
  border-bottom: 2px solid blue;
}

</style>

4.content.vue

<script>
export default {
    name: "Content",
    props: {
        panes: {
            type: Array,
            default: function() {
                return [];
            }
        }
    },
    render() {
        return (
            <div>
                {
                    this.panes.map((element,index) => {
                        return element.active ? element.$slots.default : "" ;
                    })
                }
            </div>
        );
    }
};
</script>

<style scoped>
</style>