模拟数据应该是获取到了，但热门城市、城市列表无法渲染

Question

老师 我的模拟数据可以打印出来，但是在页面上渲染不了热门城市和城市列表，请问是哪里出了问题呢

<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">北京</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div class="button-wrapper"
               v-for="item of hot"
               :key="item.id"
          >
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area" v-for="(item, key) of cities" :key="key">
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div class="item border-bottom"
               v-for="innerItem of item"
               :key="innerItem.id"
          >
            {{innerItem.name}}
          </div>
        </div>
      </div>
     </div>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
export default {
  name: 'CityList',
  props: {
    hot: Array,
    cities: Object
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.wrapper)
  }
}
</script>

<style lang="stylus" scoped>
  @import '~styles/variables.styl'
  .border-topbottom
    &::before
      border-color: #ccc
    &::after
      border-color: #ccc
  .border-bottom
    &::before
      border-color: #ccc
  .list
    overflow: hidden
    position: absolute
    top: 1.58rem
    right: 0
    bottom: 0
    left: 0
    .title
      line-height: .54rem
      background: #eee
      padding-left: .2rem
      color: #666
    .button-list
      overflow: hidden
      padding: .1rem .6rem .1rem .1rem
      .button-wrapper
        float: left
        width: 33.33%
        .button
          margin: .1rem
          padding: .1rem 0
          text-align: center
          border: .02rem solid #ccc
          border-radius: .06rem
    .item-list
      .item
        line-height: .54rem
        color: #666
        padding-left: .2rem
</style>

Answer 1

Samrtiboy 2020-09-29 15:05:22

同学你好，以你上面的描述及代码没法帮你找出问题来，建议你将City组件的代码也发上来，因为City组件和List是相关联的，我预测是传值问题。

1.你可以在城市列表组件中把从父组件接收的值打印出来，看看是否接收到从父组件传递过来值，如果没有接收到，就要查看一下你有没有做父组件向子组件传值的操作：

<CityList :cities="cities" :hot="hot"></CityList>

2.查看一下你在City组件中取值是否正确

• 提问者 qq_慕神1532382 #1

  老师 这是City组件的代码，我还没找出问题，麻烦老师帮我看一下
  <template>
    <div>
      <city-header></city-header>
      <city-search></city-search>
      <city-list> :cities="cities" :hot="hotCities"</city-list>
      <city-alphabet :cities="cities"></city-alphabet>
    </div>
  </template>
  
  <script>
  import axios from 'axios'
  import CityHeader from './components/Header.vue'
  import CitySearch from './components/Search.vue'
  import CityList from './components/List.vue'
  import CityAlphabet from './components/Alphabet.vue'
  export default {
    name: 'City',
    components: {
      CityHeader,
      CitySearch,
      CityList,
      CityAlphabet
    },
    data () {
      return {
        cities: {},
        hotCities: []
      }
    },
    methods: {
      getCityInfo () {
        axios.get('/api/city.json')
          .then(this.handleGetCityInfoSucc) // 请求成功后的回调方法
      },
      handleGetCityInfoSucc (res) { // 参数res即请求返回数据（response）
        console.log(res)
        res = res.data
        if (res.ret && res.data) {
          const data = res.data
          this.cities = data.cities
          this.hotCities = data.hotCities
        }
      }
    },
    mounted () {
      this.getCityInfo()
    }
  }
  </script>
  
  <style lang="stylus" scoped>
  </style>

• Samrtiboy 回复 提问者 qq_慕神1532382 #2

  传值的代码写错了，应该这样写：
      <city-list :cities="cities" :hot="hotCities"></city-list>

• 提问者 qq_慕神1532382 回复 Samrtiboy #3

  啊 是的是的 大意了 感谢。不过它竟然没有报错