Vue组件开发：城市选择器组件实现方法

<template>
  <div class="city-selector">
    <ProvinceSelector @provinceChange="handleProvinceChange" />
    <CitySelector :province="selectedProvince" @cityChange="handleCityChange" />
    <AreaSelector :city="selectedCity" @areaChange="handleAreaChange" />
    <div class="selected-result">
      <p>已选城市：{{ selectedCity }}</p>
      <p>已选区域：{{ selectedArea }}</p><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/cb6835dc7db1" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">前端免费学习笔记（深入）</a>”；</p>
                    <div class="aritcle_card">
                        <a class="aritcle_card_img" href="/xiazai/code/11146">
                            <img src="https://img.php.cn/upload/webcode/000/000/002/176511060312813.png" alt="mallcloud商城">
                        </a>
                        <div class="aritcle_card_info">
                            <a href="/xiazai/code/11146">mallcloud商城</a>
                            <p>mallcloud商城基于SpringBoot2.x、SpringCloud和SpringCloudAlibaba并采用前后端分离vue的企业级微服务敏捷开发系统架构。并引入组件化的思想实现高内聚低耦合，项目代码简洁注释丰富上手容易，适合学习和企业中使用。真正实现了基于RBAC、jwt和oauth2的无状态统一权限认证的解决方案，面向互联网设计同时适合B端和C端用户，支持CI/CD多环境部署，并提</p>
                            <div class="">
                                <img src="/static/images/card_xiazai.png" alt="mallcloud商城">
                                <span>0</span>
                            </div>
                        </div>
                        <a href="/xiazai/code/11146" class="aritcle_card_btn">
                            <span>查看详情</span>
                            <img src="/static/images/cardxiayige-3.png" alt="mallcloud商城">
                        </a>
                    </div>
                
    </div>
  </div>
</template>

<script>
import ProvinceSelector from './ProvinceSelector.vue'
import CitySelector from './CitySelector.vue'
import AreaSelector from './AreaSelector.vue'

export default {
  components: {
    ProvinceSelector,
    CitySelector,
    AreaSelector
  },
  data() {
    return {
      selectedProvince: '',
      selectedCity: '',
      selectedArea: ''
    }
  },
  methods: {
    handleProvinceChange(province) {
      this.selectedProvince = province
      this.selectedCity = ''
      this.selectedArea = ''
    },
    handleCityChange(city) {
      this.selectedCity = city
      this.selectedArea = ''
    },
    handleAreaChange(area) {
      this.selectedArea = area
    }
  }
}
</script>

<template>
  <div class="province-selector">
    <select v-model="selectedProvince" @change="handleChange">
      <option v-for="province in provinces" :key="province" :value="province">{{ province }}</option>
    </select>
  </div>
</template>

<script>
export default {
  data() {
    return {
      selectedProvince: ''
    }
  },
  computed: {
    provinces() {
      // 从后台或静态数据获取省份列表
      return ['北京', '上海', '广东', '江苏']
    }
  },
  methods: {
    handleChange() {
      this.$emit('provinceChange', this.selectedProvince)
    }
  }
}
</script>

<template>
  <div class="city-selector">
    <select v-model="selectedCity" @change="handleChange">
      <option v-for="city in cities" :key="city" :value="city">{{ city }}</option>
    </select>
  </div>
</template>

<script>
export default {
  props: {
    province: {
      type: String,
      default: ''
    }
  },
  data() {
    return {
      selectedCity: ''
    }
  },
  computed: {
    cities() {
      // 根据选择的省份从后台或静态数据获取城市列表
      if (this.province === '北京') {
        return ['北京市', '朝阳区', '海淀区']
      } else if (this.province === '上海') {
        return ['上海市', '黄浦区', '徐汇区']
      } else if (this.province === '广东') {
        return ['广州市', '深圳市', '珠海市']
      } else if (this.province === '江苏') {
        return ['南京市', '苏州市', '无锡市']
      } else {
        return []
      }
    }
  },
  watch: {
    province(newValue) {
      this.selectedCity = ''
    }
  },
  methods: {
    handleChange() {
      this.$emit('cityChange', this.selectedCity)
    }
  }
}
</script>

<template>
  <div class="area-selector">
    <select v-model="selectedArea" @change="handleChange">
      <option v-for="area in areas" :key="area" :value="area">{{ area }}</option>
    </select>
  </div>
</template>

<script>
export default {
  props: {
    city: {
      type: String,
      default: ''
    }
  },
  data() {
    return {
      selectedArea: ''
    }
  },
  computed: {
    areas() {
      // 根据选择的城市从后台或静态数据获取区域列表
      if (this.city === '北京市') {
        return ['东城区', '西城区', '朝阳区']
      } else if (this.city === '上海市') {
        return ['黄浦区', '徐汇区', '长宁区']
      } else if (this.city === '广州市') {
        return ['越秀区', '海珠区', '天河区']
      } else if (this.city === '南京市') {
        return ['玄武区', '秦淮区', '鼓楼区']
      } else {
        return []
      }
    }
  },
  watch: {
    city(newValue) {
      this.selectedArea = ''
    }
  },
  methods: {
    handleChange() {
      this.$emit('areaChange', this.selectedArea)
    }
  }
}
</script>

<template>
  <div>
    <CitySelector />
  </div>
</template>

<script>
import CitySelector from './CitySelector.vue'

export default {
  components: {
    CitySelector
  }
}
</script>