<template>
 <div class="wrapper" ref="wrapper">
   <ul>
    <li v-for="item in 8">{{item}}</li>
   </ul>
 </div>
</template>
<script>
 import BScroll from 'better-scroll';
  export default {
   mounted() {
    this.$nextTick(() => {
     this.scroll = new BScroll(this.$refs.wrapper);
    });
   }
  };
</script>
<style type="text/css">
 .wrapper{
  overflow:hidden;
  height:100vh;
 }
 ul li{
  height:400px;
 }
</style>

<template>
 <div class="tab" ref="tab">
  <ul class="tab_content" ref="tabWrapper">
   <li class="tab_item" v-for="item in itemList" ref="tabitem">
     {{item.title}}
   </li>
  </ul>
 </div>
 </template>
 <script>
 import BScroll from 'better-scroll';
  export default {
   data() {
    return{
     itemList:[
     {
      'title':'關(guān)注'
     },
     {
      'title':'推薦'
     },
     {
      'title':'深圳'
     },
     {
      'title':'視頻'
     },
     {
      'title':'音樂'
     },
     {
      'title':'熱點(diǎn)'
     },
     {
      'title':'新時(shí)代'
     },
     {
      'title':'娛樂'
     },
     {
      'title':'頭條號'
     },
     {
      'title':'問答'
     },
     {
      'title':'圖片'
     },
     {
      'title':'科技'
     },
     {
      'title':'體育'
     },
     {
      'title':'財(cái)經(jīng)'
     },
     {
      'title':'軍事'
     },
     {
      'title':'國際'
     }
     ]
    }
   },
   created() {
    this.$nextTick(() => {
     this.InitTabScroll();
    });
   },
   methods:{
    InitTabScroll(){
     let width=0
     for (let i = 0; i <this.itemList.length; i++) {
       width+=this.$refs.tabitem[0].getBoundingClientRect().width; //getBoundingClientRect() 返回元素的大小及其相對于視口的位置
     }
     this.$refs.tabWrapper.style.width=width+'px'
     this.$nextTick(()=>{
       if (!this.scroll) {
        this.scroll=new BScroll(this.$refs.tab, {
         startX:0,
         click:true,
         scrollX:true,
         scrollY:false,
         eventPassthrough:'vertical'
        });
       }else{
        this.scroll.refresh()
       }
     });
    }
   }
  };
 </script>
 <style lang="scss" scoped>
 .tab{
  width: 100vw;
  overflow: hidden;
  padding:5px;
  .tab_content{
   line-height: 2rem;
   display: flex;
   .tab_item{
    flex: 0 0 60px;
    width:60px;
   } 
  }
 } 
 </style>