wxmini/components/navbar/navbar.wxml

<view class='nav-wrap nav-bgc-class' style='height: calc({{navBarHeight}}px - {{MenuButtonTop}}px); padding-top: {{MenuButtonTop}}px;'>
  <view class="nav-info" style="height: {{ MenuButtonheight }}px;">
    <view bindtap='_navback' style="height: {{ MenuButtonheight }}px;" class="device-pic">
      <image wx:if='{{navbarData.showCapsule}}' bindtap="" mode="heightFix" src="./../../img/goback.png"></image>
    </view>
    <text class="nav-title-class" style="height: {{ MenuButtonheight }}px; line-height: {{ MenuButtonheight }}px;">{{navbarData.title}}</text>
  </view>
</view>