MD_YOSwechat/miniprogram_npm/@vant/weapp/dropdown-menu/index.wxml

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

<view class="van-dropdown-menu van-dropdown-menu--top-bottom custom-class">
    <slot name='leftSlot' />

    <view wx:for="{{ itemListData }}" wx:key="index" data-index="{{ index }}" class="{{ utils.bem('dropdown-menu__item', { disabled: item.disabled }) }}" bind:tap="onTitleTap">
        <view class="{{ item.titleClass }} {{ utils.bem('dropdown-menu__title', { active: item.showPopup, down: item.showPopup === (direction === 'down') }) }}" style="{{ item.showPopup ? 'color:' + activeColor : '' }}">
            <view class="van-ellipsis">
                {{ computed.displayTitle(item) }}
            </view>
        </view>
    </view>

    <slot />
</view>