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Sub originali cogitando, electio scriniorum lapsus descendentium saepe est ut primum tabulam primi gradus gutta-in cistae ligare, deinde sub cistae guttae inmutata, optionem hodiernam in eventu permanenti obtine; tunc ligabis secundo gradu gutta-in cistae datae, et sic porro.

Cogitationem tuam mutare debes sub Vue compage. Primum data primi gradus gutta-in archa pone, et tunc optionis observa :

<el-form-item label="省">
      <el-select v-model="where.provinceId" placeholder="请选择省份" clearable >
             <el-option v-for="item in provinces" :key="item.id" :label="item.name" :value="item.id" />
       </el-select>
</el-form-item>
<el-form-item label="市">
      <el-select v-model="where.cityId" placeholder="请选择市" clearable>
             <el-option v-for="item in cities" :key="item.id" :label="item.name" :value="item.id" />
       </el-select>
</el-form-item>

const provinces = ref([])
const cities = ref([])
 
onMounted(()=>{
    // 通过接口获取省份
    provinces.value = [...data]
})
 
watch: {
    provinceId: {
      deep: true,
      handler() {
        // 根据接口获取市的数据
        cities.value=[...data]
        // 清空城市的选择
        where.cityId=''
      }
    }
},