vant-weapp/packages/tree-select/demo/index.wxml

<demo-block title="单选模式">
  <van-tree-select
    items="{{ items }}"
    main-active-index="{{ mainActiveIndex }}"
    active-id="{{ activeId }}"
    bind:click-item="onClickItem"
    bind:click-nav="onClickNav"
  ></van-tree-select>
</demo-block>

<demo-block title="多选模式">
  <van-tree-select
    max="2"
    items="{{ items }}"
    main-active-index="{{ mainActiveIndexMulti }}"
    active-id="{{ activeIdMulti }}"
    bind:click-item="onClickItemMulti"
    bind:click-nav="onClickNavMulti"
  ></van-tree-select>
</demo-block>

<demo-block title="自定义内容">
  <van-tree-select
    items="{{ [{ text: '分组 1' }, { text: '分组 2' }] }}"
    height="55vw"
    main-active-index="{{ mainActiveIndex }}"
    active-id="{{ activeId }}"
    bind:click-item="onClickItem"
    bind:click-nav="onClickNav"
  >
    <van-image
      wx:if="{{ mainActiveIndex === 0 }}"
      src="https://img.yzcdn.cn/vant/apple-1.jpg"
      width="100%"
      height="100%"
      slot="content"
    />
    <van-image
      wx:elif="{{ mainActiveIndex === 1 }}"
      src="https://img.yzcdn.cn/vant/apple-2.jpg"
      width="100%"
      height="100%"
      slot="content"
    />
  </van-tree-select>
</demo-block>

<demo-block title="徽标提示">
  <van-tree-select
    items="{{ badgeItems }}"
    main-active-index="{{ mainActiveIndex }}"
    active-id="{{ activeId }}"
    bind:click-item="onClickItem"
    bind:click-nav="onClickNav"
  ></van-tree-select>
</demo-block>