先上效果：

普通屏：

 大屏：

 也就是根据盒子大小来排布，能排满就直接排列，否则显示...

思路就是获取外部盒子宽度，除以每个集数的宽度+marginRight，得出每一列最多排列的个数maxNum，然后根据：集数总和 > (maxNum*2)，来决定是否显示省略号，剩下的就是判断某几个元素的marginRight是否为0（以免超过盒子宽度，导致不必要的换行），整个组件如下：

<template>
  <ul class="episode-ul" @click="onClick">
    <template v-if="isFold">
      <li
        v-for="num in maxNum - 1"
        :key="'fold' + num"
        :data-num="num"
        class="video-episode-li"
        :class="{ active: selectNum === num }"
      >
        {{ num }}
        <videoTypeIcon
          :is-free-limit="list[num - 1].isFreeLimit === 1"
          :is-vip-saction="list[num - 1].isVipSaction === 1"
        />
      </li>
      <li class="video-episode-li video-episode-more" data-num="more">…</li>
      <li
        v-for="num in leftNumArray"
        :key="'last' + num"
        :data-num="episodeLen - num"
        :class="[{ active: selectNum === episodeLen - num },{'fold-item':num===0}]"
        class="video-episode-li"
      >
        {{ episodeLen - num }}
        <videoTypeIcon
          :is-free-limit="list[episodeLen - num - 1].isFreeLimit === 1"
          :is-vip-saction="list[episodeLen - num - 1].isVipSaction === 1"
        />
      </li>
    </template>
    <template v-else>
      <li
        v-for="(item, index) in list"
        :key="index"
        :class="[{ active: selectNum === item.num },{'fold-item':(index===maxNum-1)||(index===2*maxNum-1)}]"
        :data-num="item.num"
        class="video-episode-li"

      >
        {{ item.num }}
        <videoTypeIcon
          :is-free-limit="item.isFreeLimit === 1"
          :is-vip-saction="item.isVipSaction === 1"
        />
      </li>
    </template>
  </ul>
</template>

<script>
export default {
  name: 'EpisodeList',
  props: {
    //剧集数据
    list: {
      type: Array,
      default: () => []
    },
    // 外面盒子的宽度
    boxWith: {
      type: Number,
      default: 703
    }
  },
  data() {
    return {
      episodeLen: 0,
      selectNum: 1,
      maxNum: 10, //每行最多渲染多少个，用Math.round(boxWidth/64),64=每个元素宽度52+marginRight12
    }
  },
  computed:{
    // 是否显示...，显示条件，是否可以容纳两行
    isFold(){
      return this.episodeLen > (this.maxNum*2)
    },
    leftNumArray(){
      const arr = Array.from({length:this.maxNum}, (v,k) => k)
      return arr.reverse()
    }
  },
  watch: {
    list: {
      handler(newVal) {
        this.episodeLen = newVal.length
      },
      immediate: true,
      deep: true
    }
  },
  created() {
    this.maxNum = Math.round(this.boxWith / 64) || 10
  },
  methods: {
    //事件代理
    onClick(e) {
      if (e.target.nodeName.toLowerCase() === 'li') {
        // const searchVal = e.target.innerHTML
        // console.log(e.target.innerHTML)
        // console.log(e.target.dataset)
        const { num } = e.target.dataset
        this.selectNum = num * 1
        this.$emit('onClick', this.selectNum)
      }
    }
  }
}
</script>

<style lang="scss" scoped>
.episode-ul {
  display: flex;
  flex-wrap: wrap;
  .video-episode-li {
    width: 52px;
    height: 52px;
    border-radius: 6px;
    background: #25252c;
    font-size: 14px;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #ffffff;
    line-height: 20px;
    margin: 0 12px 12px 0;
    position: relative;
    cursor: pointer;
    @include flex-center;
    &.video-episode-more,&.fold-item {
      margin-right: 0;
    }
    &.active{
      color: $primary;
    }
    &:nth-child(n + 11) {
      margin-bottom: 0;
    }
    &:hover{
      color: $primary;
    }
  }
}
</style>

 <episodeList
          :list="mockData"
          :box-with="videoIntroWidth"
          class="video-episode-list"
        />



data(){
    return:{
          mockData:[],
           videoIntroWidth :0
    }
},
  mounted() {
    this.mockData = []
    for (let a = 0; a < 34; a++) {
      this.mockData.push({
        isFreeLimit: 0,
        isVipSaction: 1,
        name: '皆大欢喜古装版' + a,
        num: 1 + a,
        tryWatchType: 1,
        uuid: 'ff808081612b4d54016145eadfa5047c'
      })
    }
    this.getVideoIntroWidth()
  },
  methods:{
         getVideoIntroWidth() {
      const videoIntroDom = document.getElementsByClassName('box')
      if (videoIntroDom && videoIntroDom[0]) {
        this.videoIntroWidth = videoIntroDom[0].clientWidth
      }
    }

    

    }