<!-- 使用fixed定位 -->
<view class="navigator">
  <view class="navigator" style="height: {{statusBarHeight + 46}}px;">
    <view class="navigatorTitle">
      {{title}}
    </view>
    <view class="backWrapper"  bind:tap="back">
      <van-icon name="arrow-left" wx:if="{{canBack}}" class="back" />
    </view>
  </view>
</view>
<!-- 填充fixed定位页面被覆盖的组件 -->
<view class="wrapper" style="height: {{statusBarHeight + 46}}px"></view>