reader/components/navigationBar/index.wxml

<!-- 自定义顶部栏 -->
<view class="nav-bar" style="height:{{navBarHeight}}px;">
    <view class="view" style="height:{{menuHeight}}px;top:{{menuTop}}px;">
        <view class="selectGrade" bindtap="showGrade">{{userInfo.gradeName}}</view>
        <view class="title">{{title}}</view>
    </view>
</view>

<!-- 
  内容区域：
  自定义顶部栏用的fixed定位，会遮盖到下面内容，注意设置好间距
-->
<view class="content" style="margin-top:{{navBarHeight}}px;"></view>

<view wx:if="{{isGradeShow}}" class="gradeContainer" catchtouchmove='true' style="margin-top:{{navBarHeight}}px;"
    bindtap="closeGrade">
    <view class="gradeBox" catchtap="selectGrade">
        <view class="title">请选择年级</view>
        <view class="content">
            <view class="grade oneRow {{temporaryGrade=='PRESCHOOL'?'check':''}}" data-code="PRESCHOOL">学前班</view>
        </view>
        <view class="content">
            <view class="grade {{temporaryGrade=='PRIMARY_FIRST_GRADE'?'check':''}}" data-code="PRIMARY_FIRST_GRADE">一年级
            </view>
            <view class="grade {{temporaryGrade=='PRIMARY_SECOND_GRADE'?'check':''}}" data-code="PRIMARY_SECOND_GRADE">
                二年级
            </view>
        </view>
        <view class="content">
            <view class="grade {{temporaryGrade=='PRIMARY_THREE_GRADE'?'check':''}}" data-code="PRIMARY_THREE_GRADE">三年级
            </view>
            <view class="grade {{temporaryGrade=='PRIMARY_SENIOR_GRADE'?'check':''}}" data-code="PRIMARY_SENIOR_GRADE">
                四年级
            </view>
        </view>
        <view class="content">
            <view class="grade {{temporaryGrade=='PRIMARY_THREE_GRADE'?'check':''}}" data-code="PRIMARY_THREE_GRADE">五年级
            </view>
            <view class="grade {{temporaryGrade=='PRIMARY_SENIOR_GRADE'?'check':''}}" data-code="PRIMARY_SENIOR_GRADE">
                六年级
            </view>
        </view>
        <view class="submitBox">
            <button class="resetBtn submit" bindtap="changeGrade">确定</button>
        </view>
    </view>
</view>