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>  </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>