js:

Page({
  data: {
    scrollTop: null
  },
  //滚动条监听
  scroll: function (e) {
    this.setData({ scrollTop: e.detail.scrollTop })
  },
})

wxml:

<view style="height:100%;position:fixed;width:100%;">
  <scroll-view scroll-y="false" bindscroll="scroll" style="height:100%;">
    <view class="page-bottom-content">
      <text>xyz</text>
    </view>
    <view class="page-banner">
      banner
    </view>
    <view class="page-group {{scrollTop > 360 ? 'page-group-position' : ''}}">
      <view class="page-nav-list">
        <text>首页</text>
      </view>
      <view class="page-nav-list">
        <text>活动</text>
      </view>
      <view class="page-nav-list">
        <text>菜单</text>
      </view>
      <view class="page-nav-list">
        <text>我的</text>
      </view>
    </view>
    <view class="goods-list">
      goods-list
    </view>
  </scroll-view>

  <view style="height:100%;position:fixed;width:100%;">
    <scroll-view scroll-y="false" bindscroll="scroll" style="height:100%;">
      <view class="page-bottom-content">
        <text>{{text}}</text>
      </view>
      <view class="page-banner">
        banner
      </view>
      <view class="page-group {{scrollTop > 360 ? 'page-group-position' : ''}}">
        <view class="page-nav-list">
          <text>首页</text>
        </view>
        <view class="page-nav-list">
          <text>活动</text>
        </view>
        <view class="page-nav-list">
          <text>菜单</text>
        </view>
        <view class="page-nav-list">
          <text>我的</text>
        </view>
      </view>
      <view class="goods-list">
        goods-list
      </view>
    </scroll-view>
  </view>
</view>

wxss:

.page-banner{height: 500rpx;background-color: greenyellow;padding: 20rpx;color:#fff;}
.page-group{
  display: table;
  background-color: blueviolet;
  width: 100%;
  table-layout: fixed;
  position: relative;
  top: 0;
  left: 0;
}
.page-group-position{
  position: fixed;
}
.page-nav-list{
  padding:30rpx 0 ;
  display: table-cell;
  text-align: center;
  color: #fff;
}
.goods-list{
  height: 2000rpx;
  background-color: green;
  padding: 20rpx;
  color:#fff;
}