使用场景：由于vue有$parent属性可以让子组件访问父组件。但孙组件想要访问祖先组件就比较困难。通过provide/inject可以轻松实现跨级访问祖先组件的数据
父页面注入

 import { getQueryString } from 'utils/helper';
import { get_menu_permission } from 'api/cooperation-in-page';
export default {
  name: 'MyBusinessBusinessDetails',
  components: {
    BusinessInfo,
    MoreHandle,
    // LinkCompany,
    FollowRecords,
    BusinessDemandInfo,
    BusinessRole,
  },
  provide() {
    return {
      permissionType: this.permissionInfo,
    };
  },
  data() {
    return {
      businessId: '',
      from: '',
      permissionInfo: {},
    };
  },
  created() {
    let query = new getQueryString();
    this.businessId = query?.businessId;
    this.from = query?.from;
    console.log(this.from, 'this.from');
    this.getMenuPermission(this.businessId);
  },
  methods: {
    //获取操作合作联盟操作权限
    getMenuPermission(bizId) {
      const params = { bizId };
      get_menu_permission(params).then(({ code, data }) => {
        if (code === 200) {
          this.permissionInfo.info = data;
        }
      });
    },
  },
};
</script>

提示：provide 和 inject 绑定并不是可响应的，这是一个坑。然而，如果你传入了一个可监听的对象，那么其对象的属性还是可响应的 permissionInfo: {},
子组件使用

  inject: ['reload', 'permissionType'],
  console.log('exist=======', this.permissionType.info);