点赞功能（手动更新当前项 无状态刷新页面） ==》点赞的时候手动拼接

                <block wx:if="{{item.tags==0}}">

                  <image class="vote_s" data-num="1" data-id="{{item.id}}" data-index="{{index}}" catchtap="getTagsArticle" src="../../../../images/upvote_s.png"></image>

                  <text style="margin-left:4rpx;">{{item.tags_num}}</text>

                </block>

                <block wx:else>

                  <image class="vote_s" data-num="-1" data-id="{{item.id}}" data-index="{{index}}" catchtap="getTagsArticle" src="../../../../images/vote_s.png"></image>

                  <text style="margin-left:4rpx;">{{item.tags_num}}</text>

                </block>

 

 

 

getTagsArticle(e) {

    console.log(e)

    // 判断是否点赞 1 或者 -1

    let num = e.currentTarget.dataset.num;

    // 当前项的id

    let id = e.currentTarget.dataset.id;

    // 当前项的索引

    let idx = e.currentTarget.dataset.index;

    console.log(num, id, idx)

    const that = this;

    var postsData = {

      id: id,

      num: num

    }

    let dataInfo = requestSign.requestSign(postsData)

    header.sign = dataInfo

    wx.request({

      url: api.get_tagsArticle,

      data: postsData,

      header: header,

      method: 'POST',

      dataType: 'json',

      responseType: 'text',

      success: ({

        data

      }) => {

        console.log(data, '成功')

        if (data.code == 1) {

          if (num > 0) { //点赞

            that.data.articleList[idx].tags = 1;

            that.data.articleList[idx].tags_num++;

          } else { //取消点赞

            that.data.articleList[idx].tags = 0;

            that.data.articleList[idx].tags_num--;

          }

          that.setData({

            ["articleList[" + idx + "]"]: that.data.articleList[idx]

          })

        } else {

          wx.showToast({

            title: data.message

          })

        }

      }

    });

  }