弹出 fixed 弹窗后，在弹窗上滑动会导致下层的页面一起跟着滚动。

解决方法：

在弹出层加上 catchtouchmove 事件

示例代码：

<view class="modal-view" hidden="{{!showModal}}" bindtap="toggleModal" catchtouchmove="preventTouchMove">
  <view class="modal">
  <view class="modal-item" catchtap="makePhoneCall">{{site.phone}}</view>
  <view class="modal-item" catchtap="toggleModal">取消</view>
  </view>
</view>
 
Pages({
  preventTouchMove() {}
})

还有一种方法如下：给catchtouchmove="ture"

<view class="modal-view" hidden="{{!showModal}}" bindtap="toggleModal" catchtouchmove="ture">
  <view class="modal">
  <view class="modal-item" catchtap="makePhoneCall">{{site.phone}}</view>
  <view class="modal-item" catchtap="toggleModal">取消</view>
  </view>
</view>