<picker mode="region" level="city" bindchange="bindDateChange" data-key="region" class="flex1">
<view class="flex left acenter flex1">
<input class="txt" type="text" placeholder="请选择" placeholder-class="#999999" value="{{formDatas.region}}" name="region" id="region" bindinput="onBindInput" disabled></input>
<image class="xia" src="/pages/images/ico/xia.png"></image>
</view>
</picker>
提供能复现问题的简单代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）。
基础库是2.21.4