Ant Design Vue 省市区三级联动组件，Unknown custom element: – did you register the component correctly

1.我主要是做后端的，对于前端vue的东西并不是很难懂才出现Unknown custom element: <a-cascader> – did you register the component correctly 这个问题

2.我的需求是做省市区三级联动，然后就看了Ant Design Vue 官网，感觉有写通用性查，所以就找了现成的插件赋值

3.结果就出现了上述问题

创建文件：areaSelect.vue 代码如下，数据也在代码里，怎么处理看你们自己

<template>
  <a-cascader
    :fieldNames="{ label: 'name', value: 'name', children: 'children' }"
    :options="areaData"
    :placeholder="placeholder"
    v-model="selectedValues"
    @change="onChange"
  />
</template>
<script>
  import areaData from "./location";



  export default {
    name: "areaSelect",
    props: {
      placeholder: {
        type: String,
        default: "请选择省市区",
      },
      defaultValue: {
        type: Array,
        default() {
          return [];
        },
      },
    },
    data() {
      return {
        //地区数据
        areaData:[{"code":"11","name":"北京市","children":[{"code":"1101","name":"市辖区","children":[{"code":"110101","name":"东城区"},{"code":"110102","name":"西城区"},{"code":"110105","name":"朝阳区"},{"code":"110106","name":"丰台区"},{"code":"110107","name":"石景山区"},{"code":"110108","name":"海淀区"},{"code":"110109","name":"门头沟区"},{"code":"110111","name":"房山区"},{"code":"110112","name":"通州区"},{"code":"110113","name":"顺义区"},{"code":"110114","name":"昌平区"},{"code":"110115","name":"大兴区"},{"code":"110116","name":"怀柔区"},{"code":"110117","name":"平谷区"},{"code":"110118","name":"密云区"},{"code":"110119","name":"延庆区"}]}]},{"code":"12","name":"天津市","children":[{"code":"1201","name":"市辖区","children":[{"code":"120101","name":"和平区"},{"code":"120102","name":"河东区"},{"code":"120103","name":"河西区"},{"code":"120104","name":"南开区"},{"code":"120105","name":"河北区"},{"code":"120106","name":"红桥区"},{"code":"120110","name":"东丽区"},{"code":"120111","name":"西青区"},{"code":"120112","name":"津南区"},{"code":"120113","name":"北辰区"},{"code":"120114","name":"武清区"},{"code":"120115","name":"宝坻区"},{"code":"120116","name":"滨海新区"},{"code":"120117","name":"宁河区"},{"code":"120118","name":"静海区"},{"code":"120119","name":"蓟州区"}]}]},{"code":"13","name":"河北省","children":[{"code":"1301","name":"石家庄市","children":[{"code":"130102","name":"长安区"},{"code":"130104","name":"桥西区"},{"code":"130105","name":"新华区"},{"code":"130107","name":"井陉矿区"},{"code":"130108","name":"裕华区"},{"code":"130109","name":"藁城区"},{"code":"130110","name":"鹿泉区"},{"code":"130111","name":"栾城区"},{"code":"130121","name":"井陉县"},{"code":"130123","name":"正定县"},{"code":"130125","name":"行唐县"},{"code":"130126","name":"灵寿县"},{"code":"130127","name":"高邑县"},{"code":"130128","name":"深泽县"},{"code":"130129","name":"赞皇县"},{"code":"130130","name":"无极县"},{"code":"130131","name":"平山县"},{"code":"130132","name":"元氏县"},{"code":"130133","name":"赵县"},{"code":"130171","name":"石家庄高新技术产业开发区"},{"code":"130172","name":"石家庄循环化工园区"},{"code":"130181","name":"辛集市"},{"code":"130183","name":"晋州市"},{"code":"130184","name":"新乐市"}]},{"code":"1302","name":"唐山市","children":[{"code":"130202","name":"路南区"},{"code":"130203","name":"路北区"},{"code":"130204","name":"古冶区"},{"code":"130205","name":"开平区"},{"code":"130207","name":"丰南区"},{"code":"130208","name":"丰润区"},{"code":"130209","name":"曹妃甸区"},{"code":"130224","name":"滦南县"},{"code":"130225","name":"乐亭县"},{"code":"130227","name":"迁西县"},{"code":"130229","name":"玉田县"},{"code":"130271","name":"河北唐山芦台经济开发区"},{"code":"130272","name":"唐山市汉沽管理区"},{"code":"130273","name":"唐山高新技术产业开发区"},{"code":"130274","name":"河北唐山海港经济开发区"},{"code":"130281","name":"遵化市"},{"code":"130283","name":"迁安市"},{"code":"130284","name":"滦州市"}]},{"code":"1303","name":"秦皇岛市","children":[{"code":"130302","name":"海港区"},{"code":"130303","name":"山海关区"},{"code":"130304","name":"北戴河区"},{"code":"130306","name":"抚宁区"},{"code":"130321","name":"青龙满族自治县"},{"code":"130322","name":"昌黎县"},{"code":"130324","name":"卢龙县"},{"code":"130371","name":"秦皇岛市经济技术开发区"},{"code":"130372","name":"北戴河新区"}]},{"code":"1304","name":"邯郸市","children":[{"code":"130402","name":"邯山区"},{"code":"130403","name":"丛台区"},{"code":"130404","name":"复兴区"},{"code":"130406","name":"峰峰矿区"},{"code":"130407","name":"肥乡区"},{"code":"130408","name":"永年区"},{"code":"130423","name":"临漳县"},{"code":"130424","name":"成安县"},{"code":"130425","name":"大名县"},{"code":"130426","name":"涉县"},{"code":"130427","name":"磁县"},{"code":"130430","name":"邱县"},{"code":"130431","name":"鸡泽县"},{"code":"130432","name":"广平县"},{"code":"130433","name":"馆陶县"},{"code":"130434","name":"魏县"},{"code":"130435","name":"曲周县"},{"code":"130471","name":"邯郸经济技术开发区"},{"code":"130473","name":"邯郸冀南新区"},{"code":"130481","name":"武安市"}]},{"code":"1305","name":"邢台市","children":[{"code":"130502","name":"襄都区"},{"code":"130503","name":"信都区"},{"code":"130505","name":"任泽区"},{"code":"130506","name":"南和区"},{"code":"130522","name":"临城县"},{"code":"130523","name":"内丘县"},{"code":"130524","name":"柏乡县"},{"code":"130525","name":"隆尧县"},{"code":"130528","name":"宁晋县"},{"code":"130529","name":"巨鹿县"},{"code":"130530","name":"新河县"},{"code":"130531","name":"广宗县"},{"code":"130532","name":"平乡县"},{"code":"130533","name":"威县"},{"code":"130534","name":"清河县"},{"code":"130535","name":"临西县"},{"code":"130571","name":"河北邢台经济开发区"},{"code":"130581","name":"南宫市"},{"code":"130582","name":"沙河市"}]},{"code":"1306","name":"保定市","children":[{"code":"130602","name":"竞秀区"},{"code":"130606","name":"莲池区"},{"code":"130607","name":"满城区"},{"code":"130608","name":"清苑区"},{"code":"130609","name":"徐水区"},{"code":"130623","name":"涞水县"},{"code":"130624","name":"阜平县"},{"code":"130626","name":"定兴县"},{"code":"130627","name":"唐县"},{"code":"130628","name":"高阳县"},{"code":"130629","name":"容城县"},{"code":"130630","name":"涞源县"},{"code":"130631","name":"望都县"},{"code":"130632","name":"安新县"},{"code":"130633","name":"易县"},{"code":"130634","name":"曲阳县"},{"code":"130635","name":"蠡县"},{"code":"130636","name":"顺平县"},{"code":"130637","name":"博野县"},{"code":"130638","name":"雄县"},{"code":"130671","name":"保定高新技术产业开发区"},{"code":"130672","name":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:"阿拉山口市"},{"code":"652722","name":"精河县"},{"code":"652723","name":"温泉县"}]},{"code":"6528","name":"巴音郭楞蒙古自治州","children":[{"code":"652801","name":"库尔勒市"},{"code":"652822","name":"轮台县"},{"code":"652823","name":"尉犁县"},{"code":"652824","name":"若羌县"},{"code":"652825","name":"且末县"},{"code":"652826","name":"焉耆回族自治县"},{"code":"652827","name":"和静县"},{"code":"652828","name":"和硕县"},{"code":"652829","name":"博湖县"},{"code":"652871","name":"库尔勒经济技术开发区"}]},{"code":"6529","name":"阿克苏地区","children":[{"code":"652901","name":"阿克苏市"},{"code":"652902","name":"库车市"},{"code":"652922","name":"温宿县"},{"code":"652924","name":"沙雅县"},{"code":"652925","name":"新和县"},{"code":"652926","name":"拜城县"},{"code":"652927","name":"乌什县"},{"code":"652928","name":"阿瓦提县"},{"code":"652929","name":"柯坪县"}]},{"code":"6530","name":"克孜勒苏柯尔克孜自治州","children":[{"code":"653001","name":"阿图什市"},{"code":"653022","name":"阿克陶县"},{"code":"653023","name":"阿合奇县"},{"code":"653024","name":"乌恰县"}]},{"code":"6531","name":"喀什地区","children":[{"code":"653101","name":"喀什市"},{"code":"653121","name":"疏附县"},{"code":"653122","name":"疏勒县"},{"code":"653123","name":"英吉沙县"},{"code":"653124","name":"泽普县"},{"code":"653125","name":"莎车县"},{"code":"653126","name":"叶城县"},{"code":"653127","name":"麦盖提县"},{"code":"653128","name":"岳普湖县"},{"code":"653129","name":"伽师县"},{"code":"653130","name":"巴楚县"},{"code":"653131","name":"塔什库尔干塔吉克自治县"}]},{"code":"6532","name":"和田地区","children":[{"code":"653201","name":"和田市"},{"code":"653221","name":"和田县"},{"code":"653222","name":"墨玉县"},{"code":"653223","name":"皮山县"},{"code":"653224","name":"洛浦县"},{"code":"653225","name":"策勒县"},{"code":"653226","name":"于田县"},{"code":"653227","name":"民丰县"}]},{"code":"6540","name":"伊犁哈萨克自治州","children":[{"code":"654002","name":"伊宁市"},{"code":"654003","name":"奎屯市"},{"code":"654004","name":"霍尔果斯市"},{"code":"654021","name":"伊宁县"},{"code":"654022","name":"察布查尔锡伯自治县"},{"code":"654023","name":"霍城县"},{"code":"654024","name":"巩留县"},{"code":"654025","name":"新源县"},{"code":"654026","name":"昭苏县"},{"code":"654027","name":"特克斯县"},{"code":"654028","name":"尼勒克县"}]},{"code":"6542","name":"塔城地区","children":[{"code":"654201","name":"塔城市"},{"code":"654202","name":"乌苏市"},{"code":"654203","name":"沙湾市"},{"code":"654221","name":"额敏县"},{"code":"654224","name":"托里县"},{"code":"654225","name":"裕民县"},{"code":"654226","name":"和布克赛尔蒙古自治县"}]},{"code":"6543","name":"阿勒泰地区","children":[{"code":"654301","name":"阿勒泰市"},{"code":"654321","name":"布尔津县"},{"code":"654322","name":"富蕴县"},{"code":"654323","name":"福海县"},{"code":"654324","name":"哈巴河县"},{"code":"654325","name":"青河县"},{"code":"654326","name":"吉木乃县"}]},{"code":"6590","name":"自治区直辖县级行政区划","children":[{"code":"659001","name":"石河子市"},{"code":"659002","name":"阿拉尔市"},{"code":"659003","name":"图木舒克市"},{"code":"659004","name":"五家渠市"},{"code":"659005","name":"北屯市"},{"code":"659006","name":"铁门关市"},{"code":"659007","name":"双河市"},{"code":"659008","name":"可克达拉市"},{"code":"659009","name":"昆玉市"},{"code":"659010","name":"胡杨河市"},{"code":"659011","name":"新星市"}]}]}]
          ,
        //选择的数据
        selectedValues: [],
      };
    },
    created() {
      if (this.defaultValue.length) {
        this.selectedValues = [...this.defaultValue];
      }
    },
    watch: {
      defaultValue(newValue) {
        if (newValue.length) {
          this.selectedValues = newValue;
        } else {
          this.selectedValues = [];
        }
      },
    },
    methods: {
      //选择好之后的回调
      onChange(value) {
        this.$emit("change", value);
      },
    },
  };
</script>
<style lang="scss" scoped>
</style>

使用方法：

<template>
              <div>
                <!-- 省市区选择器 -->
                <area-select
                  @change="selectArea"
                  :default-value="defaultArea"
                />
              </div>
            </template>



//选择地区之后的回调
selectArea(selectedArea) {
  console.log(selectedArea);
},

之后就出现了这个问题，Unknown custom element: <a-cascader> – did you register the component correctly

解决方法，在main.js 添加如下代码

import { Cascader  } from 'ant-design-vue'

Vue.use(Cascader)

效果如下：

还是去学学前端吧，如果是个老前端，这坑定不是什么问题。