shenweishi/node_modules/@vant/weapp/lib/overlay/index.wxml

<van-transition
  wx:if="{{ lockScroll }}"
  show="{{ show }}"
  custom-class="van-overlay"
  custom-style="z-index: {{ zIndex }}; {{ customStyle }}"
  duration="{{ duration }}"
  bind:tap="onClick"
  catch:touchmove="noop"
>
  <slot></slot>
</van-transition>
<van-transition
  wx:else
  show="{{ show }}"
  custom-class="van-overlay"
  custom-style="z-index: {{ zIndex }}; {{ customStyle }}"
  duration="{{ duration }}"
  bind:tap="onClick"
>
  <slot></slot>
</van-transition>