Json数据：https://yjy-oss-files.oss-cn-zhangjiakou.aliyuncs.com/tuxian/area.json

 如何访问本地文件参考：vue-访问本地json文件_vue3读取json文件-CSDN博客

 .vue文件：

<template><select v-model="mailAddress1" style="width: 19rem;" @change="provinceChange"><option :value="item" v-for="(item, index) in provinceList" :key="index">{{ item.name }}</option></select><select v-model="mailAddress2" style="width: 19rem;margin-left:1rem;" @change="cityChange"><option :value="item" v-for="(item, index) in cityList" :key="index">{{ item.name }}</option></select><select v-model="mailAddress3" style="width: 19rem;margin-left:1rem;"><option :value="item" v-for="(item, index) in countyList" :key="index">{{ item.name }}</option></select>
</template>
<script>
export default {data() {return {mailAddress1: '',mailAddress2: '',mailAddress3: '',provinceList: '',cityList: '',countyList: ''};},mounted() {fetch('/addData.json').then(response => response.json()).then(res => {this.provinceList = res});},methods: {provinceChange() {this.cityList = this.mailAddress1.areaListthis.countyList = ""},cityChange() {this.countyList = this.mailAddress2.areaList}}
}
</script>