通过 ind 唯一性，来判断是哪个select

<div
  v-for="(el,ind) in uploadMusiceInfo.tag"
  :key="ind"
  style="display: inline-block"
>
  <el-select
    v-model="uploadMusiceInfo.innerTagVal[ind]"
    :value="el.id"
    multiple
    clearable
    :placeholder="el.name"
    class="do-mr10 do-mt25"
    @focus="handlezBgmTag(el)"
    @change="handleChangeTag(el)"
  >
    <el-option
      v-for="e in uploadMusiceInfo.tagChild"
      :key="e.id"
      :label="e.name"
      :value="e.name"
    />
  </el-select>
</div>