報錯：<van-cascader> - did you register the component correctly? For recursive components, make sure to provide the "name" option
解決：利用全局引入，或者使用組件的 name 屬性作為鍵來解決
1.全局引入
//在當前頁或者main.js直接全局引入
import { Cascader } from "vant";
import Vue from "vue";
Vue.use(Cascader);
2.利用[Cascader.name]: Cascader來局部引入
//在當前頁按需引入即可
import { Cascader } from "vant";
components: { [Cascader.name]: Cascader },
