applte/pages/modelselection/modelselection.wxml

<!--pages/modelselection/modelselection.wxml-->
<van-tree-select class="selectTree"
  items="{{ items }}"  height="100vh"
  main-active-index="{{ mainActiveIndex }}"
  active-id="{{ activeId }}"
  bind:click-nav="onClickNav"
  bind:click-item="onClickItem"
/>