提供可复现问题的代码片段。

<van-popup show="{{ show }}" position="bottom" custom-style="height: 80%;border-radius:32rpx" bind:close="closeShowBook">
  <view class="bookArea">
   <view class="title">到店时间</view>
   <view class="date_select">
    <view class="key">选择日期</view>
    <view class="value1">
     <!-- <view class="section"> -->
      <picker mode="date" value="{{startTime}}" start="2020-01-01" end="2023-01-01" bindchange="bindDateChange">
       <view class="picker">
       {{startTime || '请选择'}}
       </view>
      </picker>
     <!-- </view> -->
    </view>
   </view>
   <view class="time_select">
    <view class="key">选择时间</view>
    <view class="value">
     <view class="{{timeIndex == index ? 'time_item time_item_active' : 'time_item'}}" wx:for="{{times}}" wx:key="index" bindtap="changeTime" data-index="{{index}}" >{{item}}</view>
    </view>
   </view>
   <view class="title">到店人数</view>
   <view class="people_select">
    <view class="value">
     <view class="{{peopleIndex == index ? 'people_item people_item_active' : 'people_item'}}" wx:for="{{peoples}}" wx:key="index" bindtap="changePeople" data-index="{{index}}" >{{item}}</view>
    </view>
   </view>
   <view class="title">桌位类型</view>
   <view class="tag_select">
    <view class="value">
     <view class="{{tagIndex == index ? 'tag_item tag_item_active' : 'tag_item'}}" wx:for="{{seat}}" wx:key="index" bindtap="changeTag" data-index="{{index}}" >{{item.name+"("+item.desc+")"}}</view>
    </view>
   </view>
   <view class="specialRequest" >
    <textarea auto-height placeholder="请填写您的特殊需求，我们将会尽量满足!" />
   </view>
   <view class="special_items">
    <view class="special_item">准备果盘</view>
    <view class="special_item special_item_active">吸烟区</view>
   </view>
   <view class="title">提醒</view>
   <view class="tips">
    本次预约服务将为您保留15分钟，请准时前往，逾时将视为放弃预约。MILL欢迎您的前往！
   </view>
   <view class="submit" bindtap="quickBook">立即预约</view>
  </view>
 </van-popup>

这样的代码片段：https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html