由图可见，当点击收藏成功后，弹出的弹框显示undefined，是response.data的内容
重复点击会弹出弹框提示“不能进行重复操作”，即response.data的内容
现我希望收藏成功能弹出的弹框是“收藏成功”，而非undefined，该怎么解
<template>
  <a-layout id="components-layout-demo-top" class="layout">
    <div id="header">
      <div class="logo">知&nbsp;否</div>

      <div id="title">

        <router-link :to="{name:'mainPage',params:{'id':this.id,'img':this.img,'token':this.token}}" style="color:white">
          <a-icon type="home" />&nbsp;首页
        </router-link>
      </div>

      <div id="title1">
        <router-link :to="{name:'personSpace',params:{'id':this.id,'img':this.img,'token':this.token}}" style="color:white">
          <a-icon type="user" />&nbsp;个人中心
        </router-link>
      </div>



      <a-input-search placeholder="请输入要搜索的问题" v-model="searchItem" style="width: 300px;margin: 15px 20px 10px 90px;" @search="onSearch"/>
      <button type="button" id="search" @click="onSearch" style="
    height: 15px;
    width: 120px;
    margin: 10px;
    padding: 18px;
    border-radius: 10px;
    line-height: 0px;
    font-family: 'Source Sans Pro', sans-serif;
    font-size: 20px;
    position: absolute;
    background: deepskyblue;
    font-weight: bold;
    color: white;
    border-color: skyblue;
    /*transform: translateY(4px);*/
">
        搜索问题

      </button>

      <div style="height:60px;weight:200px;float:right;padding: 0 20px;">


        <div id="right" style="padding: 10px 5px 20px 20px;">
          <a-badge :count=count title="通知" v-if=ifToken style="margin-left: 40px">
            <a-icon type="bell" style="font-size: 25px" title="通知" @click="getMessage"/>
          </a-badge>
          <router-link :to="{name:'personSpace',params:{'id':this.id,'img':this.img,'token':this.token}}">
            <a-avatar shape="square" v-if=ifToken size="large" :src=img style="margin-left: 20px;margin-bottom: 12px"/>
          </router-link>
        </div>

        <template>
          <a-dropdown>
            <a style="color:white;font-size: 20px;" >
              {{ u_name }} <a-icon type="down" style="color:white;font-size:25px" />
            </a>
            <a-menu slot="overlay" @click="onClick">
              <a-menu-item key="1">
                <a-icon type="setting" />
                设置
              </a-menu-item>
              <a-menu-item key="2" @click="logout">
                <a-icon type="logout" />
                退出
              </a-menu-item>

            </a-menu>
          </a-dropdown>
        </template>

      </div>
    </div>




    <a-layout-content style="padding: 0px 0px 0px 40px;
    width: 920px;">
      <a-breadcrumb style="margin: 20px 0">
      </a-breadcrumb>
      <div :style="{ width:'900 px',background: '#fff', padding: '24px', minHeight: '430px',}">
<!--依次类推的话，以传来的列表list中的question_id为key，依次显示各个问题，具体如下-->
        <div v-for="item in list" :key="item.question_id">
          <div style="float:right;background: red;font-size: 18px;padding:5px;color:white" v-if=item.question_authority_state>已终结</div>
          <div style="float:right;background: deepskyblue;font-size: 18px;padding:5px;color:white" v-if="item.question_authority_state === 0">未终结</div>
          <a style="font-weight: bold;font-size: 20px;color: black" @click="seeThisQuestion(item)">{{item.question_title}}</a><!--问题标题-->
          <p>{{item.question_content}}</p><!--问题内容-->
          <div style="float:left">


            <a-button type="primary" v-if="item.question_authority_state === 0" @click="collect(item)" style="width:80px;padding: 0 10px;"><a-icon type="star" theme="twoTone" />收藏&nbsp;
              {{item.collection_num}}</a-button>
            <a-button type="primary" disabled v-if="item.question_authority_state === 1" @click="collect(item)" style="width:80px;padding: 0 10px;"><a-icon type="star" theme="twoTone" />收藏&nbsp;{{item.collection_num}}</a-button>


            <a-button type="primary" v-if="item.question_authority_state === 0" @click="write(item)" style="width:80px;padding: 0 10px;"><a-icon type="message" theme="twoTone" />回答&nbsp;
               {{item.answer_num}}</a-button>
            <a-button type="primary" disabled v-if="item.question_authority_state === 1" @click="write(item)" style="width:80px;padding: 0 10px;"><a-icon type="message" theme="twoTone" />回答&nbsp; {{item.answer_num}}</a-button>
          </div>

          <a-divider/>

        </div>


<!--&lt;!&ndash;end 显示问题列表的部分-->

      </div>
    </a-layout-content>

    <div id="side_card">
      <div
          style="height: 30px;
                      width: 100%;
                      text-align: center;
                      padding: 10px 0;
                      font-size: 20px;">
        创作中心
      </div>


    <a-divider style="margin:17px 0 13px 0;"/>

      <div style="height:80px;width:100%">
        <div style="height: 80px;width: 150px;padding: 0 0 0 20px;">
          <div style="height: 80px;
                  width: 100px;
                  text-align: center;
                  font-size: 20px;">
            <a-icon type="question" style="fontSize:20px;padding: 0 0 10px 0"/><br/>
            <router-link :to="{name:'addQuestion',params:{'id':this.id,'img':this.img,'token':this.token}}">
              提问题
             </router-link>

          </div>
        </div>

      <div style="position:absolute;
            display:inline-block;
            left: 150px;
            right: 0px;
            top: 60px;
            height: 80px;
            width: 10px;">
        <div style="height: 80px;
                  width: 100px;
                  text-align: center;
                  font-size: 20px;">
          <a-icon type="edit" style="fontSize:20px;padding: 0 0 10px 0"/><br/>
          回答问题
        </div>
      </div>

    </div>
    <a-divider style="margin:17px 0 13px 0;"/>

    <a-row>
      <a-col :span="12" style="padding: 10px 40px;font-size: 20px;">
        稍后发
      </a-col>
      <a-divider type="vertical" style="height: 50px; position: absolute;right: 125px;"/>
      <a-col :span="12" style="padding: 10px 40px;font-size: 20px;">
        存草稿
      </a-col>
    </a-row>
    </div>



  </a-layout>
</template>
<script>
export default {
  name:"mainPage",
  inject:['reload'],
  data(){
    return{
      u_name:' ',
      searchItem:'',
      count:'',
      list:[],
      id:this.$route.params.id,//从登陆界面进行传值
      img:'',
      token:this.$route.params.token,
      record: '',
      ifToken: localStorage.getItem('access_token'),
     /* question_title:'',
      question_id:''*/
    }
  },
  mounted() {
    var _this = this;
    console.log("从login界面传过来的id为："+this.$route.params.id);
    console.log("从login界面传过来的token为:"+_this.token);


    _this.$axios.post('/api/quest/showQuestByTime',
        {},
        { headers: { access_token: _this.token } }
    ).then(function (response) {
      console.log("showQuestByTime:")
      console.log(response.data);
      _this.list = response.data.data;
    }).catch(function (error) {
      console.log(error);
      _this.$message.error('请求失败');
    })

    //var _this = this;
    _this.$axios.post('/api/user/selectByUserId',
        _this.$qs.stringify({
          uId:_this.id,
        }),
        {headers:{access_token:_this.token}}
    ).then(function (response) {
      console.log("主页获取登录用户信息：");
      console.log(response.data);
      console.log(response.data.data.u_img);
      console.log(response.data.data.u_name);
      _this.img = response.data.data.u_img;
      _this.u_name=response.data.data.u_name;
    }).catch(function (error) {
      console.log(error);
      //_this.$message.error('请求失败');
    })


    _this.$axios.post('/api/msg/showMsgNum',
        _this.$qs.stringify({
          userId: _this.$route.params.id,//router传值！！！
        }),{headers:{access_token:_this.token}}
    ).then(function (response) {
      console.log(response.data.data);
      /*console.log("回答数量："+response.data.data.answer_num);*/
      _this.count = response.data.data;
      //_this.list = response.data.data;
    }).catch(function (error) {
      console.log(error);
      _this.$message.error('获取消息失败');
    })
  },//end mounted自动执行函数



  methods:{
   collect(record){
     var _this=this;
     console.log("所收藏的问题id为："+record.question_id)
     console.log("所收藏的问题的提出者为："+record.user_id)
     _this.$axios.post('/api/quest/alterQuestCollectionState',
      _this.$qs.stringify({
        questionId:record.question_id,
        uId:record.user_id, //提出该问题的人
        operatorId:_this.id,
        isDeleted:3
      }),{headers:{access_token:_this.token}}
     ).then(function(response){
     console.log("response.data:"+response.data);
     _this.$message.success(response.data);
     _this.list = response.data.data;
     _this.reload();
     }).catch(function(error){
       console.log(error);
       _this.$message.error('请求失败');
     })
   },


    write(record){
      var _this = this;
      console.log(record);//打印问题详细信息
      _this.$router.push({
        path:'/writeAnswer',
        name:'writeAnswer',//路由命名
        params:{
          question_id:record.question_id,//页面之间的传值
          id:_this.id,
          img:_this.img,
          token:_this.token,
          question_title:record.question_title,
          question_content:record.question_content,
          question_state:record.question_authority_state,
        },
      });
    },//end write函数，写回答

    logout(){
      var _this = this;
      _this.$axios.post('/api/user/leave',
          _this.$qs.stringify({
            uId: this.id,
          }),{headers: {access_token:_this.token}}
      ).then(function (response) {
        console.log(response.data);
        localStorage.removeItem('access_token');
        localStorage.clear();
        _this.$router.push({
          path:'/login',
          name:'login',
        })
      }).catch(function (error) {
        console.log(error);
        _this.$message.error('请求失败');
      })
    },//end exit函数/*
    onClick ({ key }) {
      console.log(`Click on item ${key}`)
    },

    seeThisQuestion(record){
      var _this = this;
      console.log(record);//打印问题详细信息
      _this.$router.push({
        path:'/detailPage',
        name:'detailPage',//路由命名
        params:{
          question_id:record.question_id,//页面之间的传值
          id:_this.id,
          img:_this.img,
          token:_this.token,
          question_state:record.question_authority_state,
          question_title:record.question_title,
          question_content:record.question_title,
        },
      });
    },//end seeThisQuestion函数，查看这个问题的详细信息

    onSearch(){
      var _this = this;
      _this.$axios.post('/api/quest/selectByTitle',
          _this.$qs.stringify({
            questionTitle:_this.searchItem,
          }),{ headers: { access_token: _this.token } }
      ).then(function (response) {
        console.log(response.data);
        _this.$router.push({
          path:'/searchPage',
          name:'searchPage',//路由命名
          params:{
            list:response.data.data,
            id:_this.id,
            img:_this.img,
            token:_this.token
          },
        });//end 页面跳转
      }).catch(function (error) {
        console.log(error);
        _this.$message.error('请求失败');
      })
    },//end onSearch函数，进行查找问题

    getMessage(){
      var _this = this;
      _this.$router.push({
        path:'/messagePage',
        name:'messagePage',
        params:{
          id:_this.id,
          img:_this.img,
          token:_this.token,
        }
      })
    },//end getMessage函数，获取消息
  }//end methods
}
</script>
<style scoped>
@import "../assets/mainPage.css";
</style>
以上为mainPage.vue代码
这是用postman模拟前端收藏成功的返回值
收藏的方法也在其中，望不吝赐教，万分感激。
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