shenweishi/node_modules/@vant/weapp/lib/picker-column/index.wxml

<wxs src="../wxs/utils.wxs" module="utils" />
<wxs src="./index.wxs" module="computed" />

<view
  class="van-picker-column custom-class"
  style="{{ computed.rootStyle({ itemHeight, visibleItemCount }) }}"
  bind:touchstart="onTouchStart"
  catch:touchmove="onTouchMove"
  bind:touchend="onTouchEnd"
  bind:touchcancel="onTouchEnd"
>
  <view style="{{ computed.wrapperStyle({ offset, itemHeight, visibleItemCount, duration }) }}">
    <view
      wx:for="{{ options }}"
      wx:for-item="option"
      wx:key="index"
      data-index="{{ index }}"
      style="height: {{ itemHeight }}px"
      class="van-ellipsis {{ utils.bem('picker-column__item', { disabled: option && option.disabled, selected: index === currentIndex }) }} {{ index === currentIndex ? 'active-class' : '' }}"
      bindtap="onClickItem"
    >{{ computed.optionText(option, valueKey) }}</view>
  </view>
</view>