<!--components/picker/index.wxml-->
<van-popup 
  show="{{ show }}" 
  position="bottom"
  bind:close="onClose"
  
>
  <view style="width: 100vw;">
    <van-picker   
      show-toolbar
      title="{{title}}" 
      columns="{{ columns }}" 
      bind:change="onChange" 
      value-key="name" 
      bind:confirm="confirm" 
      bind:cancel="cancel" 
    />
  </view>
</van-popup>