公共组件部分

此组件是配合后台用的，每选择一次，调去一次后台接口，获取相应地址的数据。

html部分：

<template>
  <el-form-item label="地址" :label-width="'100px'">
    <el-select v-model="addList.province" placeholder="请选择省" class="address_select" @change="getcity(addList.province,true)" size="small">
      <el-option v-for="item in sheng" :key="item.id" :label="item.name" :value="item.id">
      </el-option>
    </el-select>
    <el-select v-model="addList.city" placeholder="请选择市" class="address_select" @change="getarea(addList.city,true)" size="small">
      <el-option v-for="item in shi" :key="item.id" :label="item.name" :value="item.id">
      </el-option>
    </el-select>
    <el-select v-model="addList.area" placeholder="请选择区" class="address_select" @change="postData()" size="small">
      <el-option v-for="item in qu" :key="item.id" :label="item.name" :value="item.id">
      </el-option>
    </el-select>
  </el-form-item>
</template>

JS部分：

<script>
export default {
  name: "city",
  data() {
    return {
      sheng: [],
      shi: [],
      qu: [],
    };
  },
  props: ["addList"],//从父组件接受的数据
  methods: {
    // 获取省
    getsheng() {
      var _this = this;
      _this
        .$axios({
          method: "post",
          url: "*****"//获取省的接口
        })
        .then(function(res) {
          if (res.data.flag == 0) {//请求成功
            _this.sheng = res.data.data;//将获取的数据赋值
          } 
        })
        .catch(function(response) {
          _this.$message.error(response.data.message);
        });
    },
    // 点击地区获取市
    getcity(id, is) {
      if (is) {
        //判断是否点击上一级
        this.addList.area = "";
        this.addList.city = "";
      }
      var _this = this;
      var params = {
        id: id //省的id，通过省获取此省下的市
      };
      params = this.$qs.stringify(params);
      _this
        .$axios({
          method: "post",
          url: "****",//获取市的接口
          data: params
        })
        .then(function(res) {
            console.log(res);
          if (res.data.flag == 0) {
            _this.shi = res.data.data;//赋值
          } else {
          }
        })
        .catch(function(response) {
          _this.$message.error(response.data.message);
        });
      this.postData();
    },
    // 点击城市获取区
    getarea(id, is) {
      var _this = this;
      if (is) {
        //判断是否点击上一级
        this.addList.area = "";
      }
      var params = {
        id: id //市的id，通过市获取此市下的区
      };
      params = this.$qs.stringify(params);
      _this
        .$axios({
          method: "post",
          url: "*****",//获取区的接口
          data: params
        })
        .then(function(res) {
          if (res.data.flag == 0) {
            _this.qu = res.data.data;
            _this.postData();
          } 
        })
        .catch(function(response) {
          _this.$message.error(response.data.message);
        });
      
    },
    // 向父组件传值
    postData() {
      let _this = this;
      let sheng = this.sheng;
      let shi = this.shi;
      let qu = this.qu;
     
      setTimeout(function() {
        _this.$emit("addlist", _this.addList);
      }, 10);
    }
  },
  mounted() {
    this.getsheng();
  },
  watch: {
    //监听父组件传值的变化
    addList: {
      handler: function(val, oldval) {
        this.getcity(val.province, false);
        this.getarea(val.city, false);
      },
      immediate: true, //关键
      deep: true
    }
  }
};
</script>

父组件调用部分

我将公共组件命名为City

html部分：

<City @addlist="getCity" :addList="addList"></City>    

JS部分：

<script>
// 引入省市区组件，公共组件所在的路径
import City from "../components/City";

export default {
  components: { City },
  data() {
    return {
      addList: {
        province: "",
        city: "",
        area: ""
      },
    };
  },
  methods: {
    //从子组件获取省市区
    getCity(data) {
      this.addList.province = data.province;
      this.addList.city = data.city;
      this.addList.area = data.area;
    },
  },
};
</script>