## 預設展示一行，點選箭頭展開更多，設定最大高度，超出顯示滾動條

欄位解釋：dataList為後臺介面請求的選項資料，showAll是否展示全部（型別陣列，長度跟dataList相等，屬性預設false）

<i>標籤收起展開按鈕，點選事件傳入行的index，標記點選了哪一行進行展開，showAll需要整體替換才能觸發vue的資料響應式

##樣式部分

字型行高36，預設資料行高36，overflow：hidden隱藏，點選展開設為height：auto

<template>
  <div>
    <el-row v-for="(item,index) in dataList" :key="index">
      <el-col :span="1">{{item.name}}</el-col>
      <el-col :span="21" class="items" :class="[showAll[index]?'show':'hide']">
        <span v-for="(subItem,index1) in item.contents" :key="index1" class="item">{{subItem}}</span>
      </el-col>
      <el-col :span="1">多選</el-col>
      <el-col :span="1">
        <i class="el-icon-arrow-down" @click="showItem(index)"></i>
      </el-col>
    </el-row>
  </div>
</template>

<script>
import {mallGoodsAttributeList} from '@/api/goods'
export default {
  name: 'GoodsFilter',

  data () {
    return {
      dataList: [],
      showAll: []
    }
  },

  mounted () {
    this.getList()
  },

  methods: {
    getList () {
      mallGoodsAttributeList().then(res => {
        res.data.forEach(item => {
          item.contents = item.content.split(',')
          this.showAll.push(false)
        })
        this.dataList = res.data
        console.log(this.dataList)
      })
    },
    showItem (index) {
      this.showAll.splice(index, 1, !this.showAll[index])
    }
  }
}
</script>

<style lang="scss" scoped>
.el-col{
  line-height: 36px;
}
.items{
  display: flex;
  flex-wrap: wrap;
  max-height: 260px;
  &.hide{
    height: 36px;
    overflow: hidden;
  }
  &.show{
    height: auto;
    overflow-y: scroll;
  }
}
.item{
  margin-right: 10px;
}
</style>