reader/pages/grade/grade.wxml

<!--pages/grade/grade.wxml-->
<view class="change_grade">
  <view class="change_brage_wrapper">
    <text class="title">分龄选择</text>
    <view class="change_row">
      <view class="change_item" bindtap="changeGrade" data-code="0">
        学前班
      </view>
      <view class="change_item" bindtap="changeGrade" data-code="1">
        一年级
      </view>
    </view>
     <view class="change_row">
      <view class="change_item" bindtap="changeGrade" data-code="2">
        二年级
      </view>
      <view class="change_item" bindtap="changeGrade" data-code="3">
        三年级
      </view>
    </view>
  </view>
</view>