微信小程序对onShareAppMessage进行封装，分为分享到个人和分享到群

1.底层代码封装到util工具js里面

function onShareAppMessage(title, path, callback, imageUrl) {
  //设置一个默认分享背景图片
  let defaultImageUrl = '../../images/share.jpg';
  return {
    title: title,
    path: path,
    imageUrl: imageUrl || defaultImageUrl,
    success(res) { 
      console.log("转发成功！");
      if (!res.shareTickets) {
      	//分享到个人
        api.shareFriend().then(() => {
          console.warn("shareFriendSuccess!");
          //执行转发成功以后的回调函数
          callback && callback();
        });
      } else {
      	//分享到群
        let st = res.shareTickets[0];
        wx.getShareInfo({
          shareTicket: st,
          success(res) {
            let iv = res.iv
            let encryptedData = res.encryptedData;
            api.groupShare(encryptedData, iv).then(() => {
              console.warn("groupShareSuccess!");
              //执行转发成功以后的回调函数
              callback && callback();
            });
          }
        });
      }
    },
    fail: function (res) {
      console.log("转发失败！");
    }
  };
}

//将其方法导出
module.exports = {
  onShareAppMessage: onShareAppMessage
}

2.调用示例

  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function (e) {
    let nickName = '';
    try {
      nickName = getApp().globalData.userInfo.nickName;
    } catch (e) {
      console.warn("用户未授权！");
      nickName = '有人';
    }
    let title = `[${nickName}@我]帮我看看这个叫什么,经常吃却不知道名字`;;
    let path = '/pages/index/index';
    let shareCallBack = () => {
    	//分享成功后做的事情
        //
        //
    };
    //此处调用封装好的分享代码
    return util.onShareAppMessage(title, path, shareCallBack);
  },