<!-- 没有按钮的情况 -->
<view class="custom flex_center" style="padding-top:{{statusBarHeight}}px" wx:if="{{!isshowbtn}}">
    <view class='custom iconv' bindtap="prePageTap">
        <image class="back" src="../../static/index/back_my.png"  />
    </view>
    <view class='custom title'>{{title}}</view>
</view>
<!-- 显示按钮的情况 -->
<view class="custom flex_center" style="padding-top:{{statusBarHeight}}px" wx:else>
    <view class='custom iconv' bindtap="gradeTap">
        <text class="custom text">{{gradeText}}</text>
        <view class="custom arrow"></view>
    </view>
    <view class='custom title'>{{title}}</view>
</view>
<!-- 站位行，填补空白 -->
<view class="empty_custom" style="padding-top:{{statusBarHeight}}px"></view>