werun-wxapp/miniprogram_npm/@vant/weapp/tree-select/index.wxml

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

<view
  class="van-tree-select"
  style="height: {{ utils.addUnit(height) }}"
>
  <scroll-view scroll-y class="van-tree-select__nav">
    <van-sidebar active-key="{{ mainActiveIndex }}" bind:change="onClickNav" custom-class="van-tree-select__nav__inner">
      <van-sidebar-item
        wx:for="{{ items }}"
        wx:key="index"
        custom-class="main-item-class"
        active-class="main-active-class"
        disabled-class="main-disabled-class"
        badge="{{ item.badge }}"
        dot="{{ item.dot }}"
        title="{{ item.text }}"
        disabled="{{ item.disabled }}"
      />
    </van-sidebar>
  </scroll-view>
  <scroll-view scroll-y class="van-tree-select__content">
    <slot name="content" />
    <view
      wx:for="{{ subItems }}"
      wx:key="id"
      class="van-ellipsis content-item-class {{ utils.bem('tree-select__item', { active: wxs.isActive(activeId, item.id), disabled: item.disabled }) }} {{ wxs.isActive(activeId, item.id) ? 'content-active-class' : '' }} {{ item.disabled ? 'content-disabled-class' : '' }}"
      data-item="{{ item }}"
      bind:tap="onSelectItem"
    >
      {{ item.text }}
      <van-icon
        wx:if="{{ wxs.isActive(activeId, item.id) }}"
        name="{{ selectedIcon }}"
        size="16px"
        class="van-tree-select__selected"
      />
    </view>
  </scroll-view>
</view>