微信小程序下面商品左右滑动上面tab也跟随变动功能实现

<scroll-view class="cates" scroll-x="true" scroll-with-animation="true" >
    <block wx:for="{{cates}}" wx:key="index">
      <view class="{{item.id === currentId?'cate-item-act cate-item':'cate-item'}}" data-id="{{item.id}}" bindtap="cateChange">{{item.name}}</view>
    </block>
</scroll-view>

/* 分类 */
.cates {
  position: fixed;
  z-index: 100;
  top: 0;
  white-space: nowrap;
  width: 100%;
  padding: 20rpx 30rpx;
  box-sizing: border-box;
  font-family: Hiragino Sans GB;
  background-color: #fff;
  border-top: 1rpx solid #eee;
}
.cates .cate-item {
  display: inline-block;
  padding: 10rpx 20rpx;
  font-size: 26rpx;
  margin-right: 20rpx;
  color: #767A84;
}
.cates .cate-item:last-child{
  margin-right: 0rpx;
}
.cates .cate-item-act {
  background: #3293FF;
  color: #fff;
  border-radius: 48rpx;
}

<view class="content">
    <swiper class="cont-swiper" bindchange="swiperSwitchTab" style="height: 600px;">
      <block wx:key="index" wx:for="{{cates}}">
        <swiper-item class="cont-swiper-item" data-id="{{item.id}}" style="height:100%" wx:key="*this">
          <!-- 每个tab对应的商品 -->
          <scroll-view scroll-y="true" style="height: 600px;" bindscroll="contenScrollY" scroll-with-animation="true">
            <block wx:for="{{serviceList}}" wx:key="index">
              <view class="con-item">{{item.name}}</view>
            </block>
          </scroll-view>  
        </swiper-item>
      </block>
    </swiper>
 </view>

/* 内容 */
.content {
  width: 100%;
  height: 100%;
  padding: 130rpx 0rpx;
  box-sizing: border-box;
}
.content .cont-swiper {
  padding: 0 30rpx;
}
.content .con-item {
  width: 100%;
  height: 200rpx;
  background-color: rgb(180, 140, 221);
  margin-top: 30rpx;
  border-radius: 20rpx;
  line-height: 200rpx;
  text-align: center;
}

swiperSwitchTab(e){
    // e.detail.current tab的index
    console.log('左右滑动下面商品',e.detail.current)
    this.setData({
      currentId: this.data.cates[e.detail.current].id
    })
    // 根据id去调用接口，替换listData数据　　 this.getData();}