vue2的评论组件如何实时显示评论的数量？

如截图所示，我新增了一条评论之后，对应的icon图标显示评论数量并没有立刻，只有通过刷新网页才能显示新的评论数量，
若要做到实时同步评论数量，该如何做到？

给出底部布局的代码：

<template>
  <div class="article-container">
    
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="clickLeftBack"
    >van-nav-bar>
    

    <div class="main-wrap">
      
      <div v-if="loading" class="loading-wrap">
        <van-loading
          color="#3296fa"
          vertical
        >加载中van-loading>
      div>
      

      
      <div v-else-if="article.title" class="article-detail">
        
        <h1 class="article-title">{{ article.title }}h1>
        

        
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}div>
          <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}div>
          
          <follow-user
            class="follow-btn"
            v-model="article.is_followed"
            :user-id="article.aut_id"
          />
          
        van-cell>
        

        
        <div
          class="article-content markdown-body"
          v-html="article.content"
          ref="article-content"
        >div>
        <van-divider>正文结束van-divider>
        

        
        <comment-list
          :source="article.art_id"
          :list="commentList"
          @onload-success="totalCommentCount = $event.total_count"
        />
        

        
        <div class="article-bottom">
          <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
            @click="isPostShow = true"
          >写评论van-button>
          <van-icon
            class="comment-icon"
            name="comment-o"
            :info="totalCommentCount"
            @click="isPostShow = true"
          />
          <collect-article
            class="btn-item"
            v-model="article.is_collected"
            :article-id="article.art_id"
          />
          <like-article
            class="btn-item"
            v-model="article.attitude"
            :article-id="article.art_id"
          />
          <van-icon name="share" color="#777777">van-icon>
        div>
        

        
        <van-popup
          v-model="isPostShow"
          position="bottom">
          <comment-post
            :target="article.art_id"
            @post-success="onPostSuccess"
          />
        van-popup>
        
      div>
      

      
      <div v-else-if="errStatus === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！p>
      div>
      

      
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！p>
        <van-button
          class="retry-btn"
          @click="loadArticle"
        >点击重试van-button>
      div>
      
    div>
  div>
template>

<script>
import { getArticleById } from '../../api/article'
import { ImagePreview } from 'vant'
// import { addFollow, deleteFollow } from '../../api/user'
import FollowUser from '@/components/follow-user'
import CollectArticle from '@/components/collect-article'
import LikeArticle from '@/components/like-article'
import CommentList from '@/views/article/component/comment-list'
import CommentPost from '@/views/article/component/comment-post'

export default {
  name: 'ArticleIndex',
  components: {
    CollectArticle,
    FollowUser,
    LikeArticle,
    CommentList,
    CommentPost
  },
  data () {
    return {
      article: {}, // 文章详情
      loading: true, // 加载中的 loading 状态
      errStatus: 0, // 失败的状态码
      followLoading: false,
      totalCommentCount: 0,
      isPostShow: false, // 控制发布评论的显示状态
      commentList: [], // 评论列表
      isReplyShow: false,
      currentComment: {} // 当前点击回复的评论项
    }
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  created () {
    this.loadArticle()
  },
  methods: {
    clickLeftBack () {
      this.$router.back()
      console.log(this.$router, '<<<  路由页面变化?')
    },
    async loadArticle () {
      try {
        const { data } = await getArticleById(this.articleId)
        console.log(data, '<<<文章详情data')
        // 数据驱动视图存在延迟
        this.article = data.data

        // 初始化图片点击的预览
        // console.log(this.$refs['article-content'])
        setTimeout(() => {
          console.log(this.$refs['article-content'])
          this.previewImage()
        }, 0)

        // 请求成功 关闭loading
        // this.loading = false
      } catch (e) {
        this.$toast('获取文章失败 请重试')
        if (e.repsonse && e.repsonse.status === 404) {
          this.errStatus = 404
        }
        console.log(e)
      }
      this.loading = false
    },

    previewImage () {
      // 得到所有的img节点
      const articleContent = this.$refs['article-content']
      const imgs = articleContent.querySelectorAll('img')
      const images = []
      imgs.forEach((img, index) => {
        images.push(img.src)
        console.log(images)
        img.onclick = () => {
          ImagePreview({
            // 预览的图片数组
            images,
            startPosition: index
          })
        }
      })
    },

    onPostSuccess (data) {
      // 关闭弹层
      this.isPostShow = false
      // 发布内容放到顶部
      this.commentList.unshift(data.new_obj)
    }
  }
}
script>

<style scoped lang="less">
@import "./github-markdown.css";

.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background-color: #fff;
  }

  .article-detail {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;

    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;

      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }

      .van-cell__label {
        margin-top: 0;
      }

      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }

      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }

      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;

      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;

    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }

    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }

    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;

    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }

    /deep/ .van-icon {
      font-size: 40px;
    }

    .comment-icon {
      top: 2px;
      color: #777;

      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }

    .btn-item {
      border: none;
      padding: 0;
      height: 40px;
      line-height: 40px;
      color: #777777
    }

    .collect-btn--collected {
      color: #ffa500;
    }

    .like-btn--liked {
      color: #e5645f;
    }
  }
}
style>

不知道你那个评论数量是怎么加载上去的，如果是通过全局的data里面的变量赋值上去的，那你只要在评论之后，赋值更新这个变量即可了吧

你这个得借助 webscoket 实现了吧 。