my_loan/htmldev/shiningWxMini/components/index-list/index.wxml

<scroll-view class="page page-select-index"
             style="height: {{windowHeight}}px;"
             enable-back-to-top
             scroll-into-view="{{intoView}}"
             scroll-y
             bindscroll="onScroll">
    <view>
        <slot></slot>
    </view>
    <view class="index_list_item"
          wx:for="{{list}}"
          wx:key="alpha"
          id="{{item.alpha}}">
        <view class="index-group__title">{{item.alpha}}</view>
        <view class="index-group__content">
            <view class="index-group__list">
                <block wx:for="{{item.subItems}}" wx:for-item="subItem" wx:key="name">
                    <view class="index-group__item thin-border-bottom"
                          hover-class="bg-highlight"
                          data-item="{{subItem}}"
                          bindtap="choose">{{subItem.name}}
                    </view>
                </block>
            </view>
        </view>
    </view>
</scroll-view>
<view class="anchor-bar__wrp wx-flex"
      catchtouchstart='scrollTo'
      catchtouchmove='scrollTo'
      catchtouchend='removeTouching'>
    <view class="anchor-bar wx-flex__item">
        <view class="anchor-list">
            <block wx:for="{{alphabet}}" wx:key="*this" wx:for-item="alpha">
                <view class="anchor-item {{current == alpha ? ( touching ? 'selected tapped' : 'selected' ): ''}}"
                      data-alpha="{{alpha}}">
                    <view class="anchor-item__inner">{{alpha}}</view>
                    <view class="anchor-item__pop">{{alpha}}</view>
                </view>
            </block>
        </view>
    </view>
</view>