在开发过程 中发现，input作为原生组件无法隐藏，用hidden={{!show}} 替换wx:if={{show}}即可

<view hidden="{{!changeQ}}" catchtouchmove="stopmove">

    <view class='toast-box'>

      <view class='toastbg'></view>

      <view class='showToast'>

        <view class='toast-title'>

          <text>修改第{{quest0.id+1}}个问题</text>

          <text>{{quest0.type==1?"单选":"多选"}}</text>

          <!-- <checkbox-group bindchange="checkboxChange">

          <checkbox value="2">多选</checkbox>

         </checkbox-group> -->

        </view>

        <view  class='toast-main'>

          <view class="inputbox">   

            <text class="input-title">问题:</text>   

            <input class='toast-input' focus="false" bindinput='getUserInput' value="{{changeQ?quest0.question:' '}}" data-quest="quest" auto-focus="false"></input>         

          </view>