switchCity/pages/switchcity/switchcity.wxml

<view class="searchLetter touchClass">
    <view wx:for="{{searchLetter}}" style="height:{{itemH}}px" wx:key="index" data-letter="{{item.name}}"
        catchtouchstart="searchStart" catchtouchmove="searchMove" catchtouchend="searchEnd">{{item.name}}</view>
</view>

<block wx:if="{{isShowLetter}}">
    <view class="showSlectedLetter">
        {{showLetter}}
    </view>
</block>
<view>当前选择城市：{{city}}</view>
<scroll-view scroll-y="true" style="height:{{winHeight}}px" bindscroll="bindScroll" scroll-top="{{scrollTop}}">
    <view class="selection" wx:for="{{cityList}}" wx:key="{{item.initial}}">
        <view class="item_letter">{{item.initial}}</view>
        <view class="item_city" wx:for="{{item.cityInfo}}" wx:for-item="ct" wx:key="{{ct.id}}" data-city="{{ct.city}}"
            bindtap="bindCity">
            {{ct.city}}
        </view>
    </view>
</scroll-view>