scroll-view描点

 wxml

    <view class="activityDetail_bottom_box">
      <view class="tabBox">
        <block wx:for="{{tabList}}" wx:key="{{index}}">
          <view class="tabStyle {{currentValue == 'x'+index ?'activeTab':''}}" bindtap="clickScroll" data-id="{{'x'+index}}">{{item}}</view>
        </block>
      </view>
      <view class="activityDetail_bottom_contentBox">
        <scroll-view scroll-y scroll-into-view="{{toView}}" scroll-with-animation="true" style="height:500px" bindscroll="scrollButton">
          <block wx:for="{{tabList}}" wx:key="{{index}}">
            <view id="{{'x'+index}}">{{item}}</view>
          </block>
        </scroll-view>
      </view>
    </view>

wxss

.activityDetail_bottom_box{
  margin-top: 32rpx;
  background: #FFFFFF;
}
.activityDetail_bottom_contentBox{
  padding:0 32rpx;
  box-sizing: border-box;
}
.activityDetail_bottom_contentBox view{
  height:500px;
  background-color:#f00;
  color:#fff;
  margin-bottom:10px;
}

js

 data: {
    bgcolor:true,
    tabList:['详情','须知','推荐'],
    currentValue:'x0',
    toView:''
  },
  // tab
  clickScroll(e){
    let x='x';
    this.setData({
      currentValue: e.currentTarget.dataset.id,
      toView: e.currentTarget.dataset.id
    })
  },
  // 滚动页面
  scrollButton(e){
    let that = this;
    // console.log(e.detail.scrollTop);
    let scrollTop = e.detail.scrollTop;
    if (scrollTop >= 0 && scrollTop < 500){
      that.setData({
        currentValue:'x0'
      })
    } else if (scrollTop >= 500 && scrollTop < 1000){
      that.setData({
        currentValue: 'x1'
      })
    } else if (scrollTop >= 1000){
      that.setData({
        currentValue: 'x2'
      })
    }
  },