Taro活动列表中，对某一个活动添加分享按钮

采用data-留下分享链接的拼接参数
1.在item文件中写按钮 openType=“share”

<Button
     className={classes.rowRightShareButton}
     openType="share"
     data-share-transfer-id={lastGiftingTransferId}
     data-share-picture-url={shareUrl}
     data-share-title={shareTitle}
     onClick={this.onShareClick}
   >
     分享好友
   </Button>
 </View>

2.onShareClick防止item详情页跳转

private onShareClick(e: ITouchEvent) {
   e.stopPropagation();
 }

3.在主页面中添加分享按钮

onShareAppMessage(obj: ShareAppMessageObject) {
    const dataset = get(obj, 'target.dataset', {});
    if (!dataset.shareTransferId) {
      return {};
    }
    const shareConfig: ShareAppMessageReturn = {
      path: `/subpackages/stored-value-card/pages/receive-gift-card/index?id=${dataset.shareTransferId}`,
      imageUrl: dataset.sharePictureUrl,
      title: dataset.shareTitle
    };
    return shareConfig;
  }