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<template>
  <p id="v-songlists-body">
    <template v-for="item in songlists">
      <md-card id="v-songlist-hover" class="v-songlist-ele" @click.native="$router.push('detail')">
        <md-card-media-cover md-solid>
          <md-card-media md-ratio="1:1">
            <img :src="item.imgUrl">
          </md-card-media>
          <md-card-area>
            <md-card-header>
              <p class="md-title">{{item.name}}</p>
              <p class="md-subhead">{{formatCount(item.playCount)}}</p>
            </md-card-header>
          </md-card-area>
        </md-card-media-cover>
      </md-card>
    </template>
  </p>
</template>

<script>
  export default {
    name: 'songlists',
    data () {
      return {
        songlists: []
      };
    },
    mounted () {
      this.songlists = [];
      this.axios.get('http://localhost:3000/top/playlist/highquality?limit=9').then(res => {
        res.data.playlists.forEach(item => {
          let obj = {
            name: item.name,
            id: item.id,
            imgUrl: item.coverImgUrl,
            playCount: item.playCount
          };
          this.songlists.push(obj);
        });
      });
    },
    methods: {
      formatCount (count) {
        return count < 100000 ? count : `${Math.floor(count / 10000)}萬`;
      }
    }
  };
</script>

<style>
  #v-songlists-body{
    display: flex;
    flex-flow: row wrap;
    justify-content: flex-start;
    width: 50%;
    margin: 0 auto;
    margin-top: 150px;
    margin-bottom: 90px;
    padding-left: 2%;
  }
  #v-songlist-hover{
    cursor: pointer;
    transition: all .4s cubic-bezier(.25,.8,.25,1);
    transition-property: box-shadow;
  }
  #v-songlist-hover:hover{
    z-index: 2;
    box-shadow: 0 5px 5px -3px rgba(0,0,0,.2),0 8px 10px 1px rgba(0,0,0,.14),0 3px 14px 2px rgba(0,0,0,.12);
  }
  .v-songlist-ele{
    width: 30%;
    margin-bottom: 3%;
    margin-right: 3%;
  }
  @media(max-width: 1000px){
    .v-songlist-ele{
      width: 45%;
      margin-bottom: 5%;
      margin-right: 5%;
    }
  }
</style>

The above is the code of the component. Make sure that axios has been installed correctly. The called localhost:3000 interface api program is also running normally locally. After testing, the data can be returned normally, but the data cannot be displayed if it cannot be accessed on the page. The chrome console reports an error.

So what is the problem? Please answer it