UI原型图：


 

页面思路：
在商品信息最小item外面有一个包裹所有item的标签，控制这个标签的高度来实现展开收起功能
 

			<!-- 药品信息 -->
			<view class="drugs" v-if="inquiryInfoSubmitBtn">
				<view class="medical">
					<view class="style-height" :style="styleHeight">
						<view class="medical-item" v-for="item in cartList" :key="item.drugsId">
							<view class="item-left">
								<view class="pos-re">
									<u-image :src="formatImgUrl(item.drugsImg)" height="80" width="80" border-radius="8" class="item-img ">
										<u-loading slot="loading"></u-loading>
										<view slot="error" class="font20">加载失败</view>
									</u-image>
									<view class="pos-ab drugs-icon drug-chufang" v-if="item.preType == 0">处方药</view>
									<view class="pos-ab drugs-icon drug-otc" v-if="item.preType == 1">OTC</view>
								</view>
								<view class="item-text">
									<view class="item-name text-ellipsis">
										<text class="tag-insurance mr-8" v-if="item.nationalDrugCode && isInsurance">医保</text>
										{{ item.drugsName }}
									</view>
									<view class="item-specification text-ellipsis">
										规格：{{ item.drugsSpecification }}
									</view>
								</view>
							</view>
							<view class="item-right">
								<view class="item-price">
									¥{{ item.sellingPrice | priceFormat }}
								</view>
								<view class="item-count">
									x{{ item.quantity }}
								</view>
							</view>
						</view>
					</view>
					
					<view class="spread" @click="clickText" v-if="cartList.length > 1">
						{{spreadText}}(共{{cartList.length}}个)<u-icon :name="iconName" color="#748099" size="24"></u-icon>
					</view>
					<u-gap height="1" bg-color="#D3DDF0" class="gap"></u-gap>
					<view class="total">
						<view class="total-text">
							共计
						</view>
						<view class="total-price">
							¥{{ totalPrice | priceFormat }}
						</view>
					</view>
				</view>
			</view>

data(){
  return{
	iconName: 'arrow-down',
	spreadText: '展开',
    styleHeight: {
	   height: '100rpx'
	},
  }
}

		clickText() {
			console.log('this.spreadText',this.spreadText)
			if(this.spreadText == '展开') {
				this.spreadText = '收起';
				this.iconName = 'arrow-up';
				this.styleHeight.height = 'auto';
			}else{
				this.spreadText = '展开';
				this.iconName = 'arrow-down';
				this.styleHeight.height = '100rpx';
			}
		},