Javascript 无法读取未定义的属性“ready”；区域：；任务：承诺；值：TypeError:无法读取未定义的属性“ready”

我正在尝试访问firebase onAuthStateChanged函数中的本地存储值。根据这一点，我想重定向用户。但我得到了这个错误。当我检查firebase onAuthStateChanged函数外部的存储值时，它工作正常。有人能告诉我为什么我无法访问onAuthStateChanged函数中的离子存储值吗

先谢谢你

home.page.ts

constructor(public storageService : StorageService){}

    ngOnInit() {
        this.validate()

      }

      async validate(){

        this.afauth.auth.onAuthStateChanged( async function(user) {
          if (user) {
            // User is signed in.

          await this.storageService.ready()
          const name = await this.storageService.get('name')
          const business_name = await this.storageService.get('business_name')

          } else {
            // No user is signed in.
          }
        });
      } 

storageservice.ts

constructor( private storage: Storage) {

   }


    async get(key: string): Promise<any> {
    try {
      const result = await this.storage.get(key);
      console.log('storageGET: ' + key + ': ' + result);
      if (result != null) {
      return result;
      }
      return null;
    } catch (reason) {
    console.log(reason);
    return null;
    }
    }


    async ready() : Promise<any>{
      try {
        this.storage.ready();
        return true; 
      }
      catch(err) {
        console.log(err)
      }
    }

---

在代码中，您有以下内容：

        this.afauth.auth.onAuthStateChanged( async function(user) {
          if (user) {
            // User is signed in.

          await this.storageService.ready()
          const name = await this.storageService.get('name')
          const business_name = await this.storageService.get('business_name')

          } else {
            // No user is signed in.
          }
        });

您应该将其更改为：

        this.afauth.auth.onAuthStateChanged( async ((user) => {
          if (user) {
            // User is signed in.

          await this.storageService.ready()
          const name = await this.storageService.get('name')
          const business_name = await this.storageService.get('business_name')

          } else {
            // No user is signed in.
          }
        });

使用arrow函数，该函数使用词法范围，这意味着您将能够读取在此函数之外定义的变量