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>