一，元素
@visible-change=‘getGiftListTable’ 需要写到select标签中

<el-select v-model="model.giftIds" value-key="giftId" placeholder="礼物特效" multiple  @visible-change='getGiftListTable'>
              <el-option v-for="item in giftList" :key="item.giftId" :label="item.giftName" :value="item.giftId" >
                <div>
                  <span>{{item.giftName}}</span>
                  <img :src="item.giftImg" width="20px" height="20px" style="float: right"/>
                </div>
              </el-option>
  </el-select>

二，js函数

  getGiftListTable(e) {
      console.log(e);
      if(e) {
      //这是显示的时候
        return false
      } else {
       //这是隐藏的时候
      }
      
    },