MiniProgram/ProjectLiaisonForm/pages/picker/area/index.js

const areaList = {
  provinces: {
    110000: '北京市',
    440000: '广东省',
  },
  cities: {
    110100: '北京市',
    440100: '广州市',
    440200: '韶关市',
    440300: '深圳市',
    440400: '珠海市',
    440500: '汕头市',
    440600: '佛山市',
  },
  counties: {
    110101: '东城区',
    110102: '西城区',
    110105: '朝阳区',
    110106: '丰台区',
    110107: '石景山区',
    110108: '海淀区',
    110109: '门头沟区',
    110111: '房山区',
    110112: '通州区',
    110113: '顺义区',
    110114: '昌平区',
    110115: '大兴区',
    110116: '怀柔区',
    110117: '平谷区',
    110118: '密云区',
    110119: '延庆区',
    440103: '荔湾区',
    440104: '越秀区',
    440105: '海珠区',
    440106: '天河区',
    440111: '白云区',
    440112: '黄埔区',
    440113: '番禺区',
    440114: '花都区',
    440115: '南沙区',
    440117: '从化区',
    440118: '增城区',
    440203: '武江区',
    440204: '浈江区',
    440205: '曲江区',
    440222: '始兴县',
    440224: '仁化县',
    440229: '翁源县',
    440232: '乳源瑶族自治县',
    440233: '新丰县',
    440281: '乐昌市',
    440282: '南雄市',
    440303: '罗湖区',
    440304: '福田区',
    440305: '南山区',
    440306: '宝安区',
    440307: '龙岗区',
    440308: '盐田区',
    440309: '龙华区',
    440310: '坪山区',
    440311: '光明区',
    440402: '香洲区',
    440403: '斗门区',
    440404: '金湾区',
    440507: '龙湖区',
    440511: '金平区',
    440512: '濠江区',
    440513: '潮阳区',
    440514: '潮南区',
    440515: '澄海区',
    440523: '南澳县',
    440604: '禅城区',
    440605: '南海区',
    440606: '顺德区',
    440607: '三水区',
    440608: '高明区',
  },
};

const getOptions = (obj, filter) => {
  const res = Object.keys(obj).map((key) => ({ value: key, label: obj[key] }));

  if (filter) {
    return res.filter(filter);
  }

  return res;
};

const match = (v1, v2, size) => v1.toString().slice(0, size) === v2.toString().slice(0, size);

Component({
  data: {
    areaText: '',
    areaValue: [],
    provinces: getOptions(areaList.provinces),
    cities: [],
    counties: [],
  },

  lifetimes: {
    ready() {
      this.init();
    },
  },

  methods: {
    init() {
      const { provinces } = this.data;
      const { cities, counties } = this.getCities(provinces[0].value);

      this.setData({ cities, counties });
    },

    onColumnChange(e) {
      console.log('pick:', e.detail);
      const { column, index } = e.detail;
      const { provinces, cities } = this.data;

      if (column === 0) {
        // 更改省份
        const { cities, counties } = this.getCities(provinces[index].value);

        this.setData({ cities, counties });
      }

      if (column === 1) {
        // 更改城市
        const counties = this.getCounties(cities[index].value);

        this.setData({ counties });
      }

      if (column === 2) {
        // 更改区县
      }
    },

    getCities(provinceValue) {
      const cities = getOptions(areaList.cities, (city) => match(city.value, provinceValue, 2));
      const counties = this.getCounties(cities[0].value);

      return { cities, counties };
    },

    getCounties(cityValue) {
      return getOptions(areaList.counties, (county) => match(county.value, cityValue, 4));
    },

    onPickerChange(e) {
      const { value, label } = e.detail;

      console.log('picker confirm:', e.detail);
      this.setData({
        areaVisible: false,
        areaValue: value,
        areaText: label.join(' '),
      });
    },

    onPickerCancel(e) {
      console.log('picker cancel', e.detail);
      this.setData({
        areaVisible: false,
      });

      if (this.data.areaValue.length) return;
      this.init();
    },

    onAreaPicker() {
      this.setData({ areaVisible: true });
    },
  },
});