Question

我有一项将来自后端的用户信息存储在本地存储中的服务。我想完成存储调用，然后继续执行代码，因为我需要立即访问本地存储中的数据。

我的服务代码：

 async setAccount(){
      if(this.globals.AccountId==0)
      {
          console.log("Account Id is 0");
          if(localStorage.getItem('AccountDetails')){
              console.log("Local Storage is there");
            let AccDetails=JSON.parse(localStorage.getItem('AccountDetails'));
            this.globals.AccountId=AccDetails["AccountId"];
          }
          else{
            console.log("No local storage found");
            let AccountObj = JSON.parse(JSON.stringify(this.authService.getAccount()));
            let AzureId: string = AccountObj["accountIdentifier"];
            console.log(AzureId);
            const sendObj: GetAccountByIdQuery = {
              AzureAccountId: AzureId
            };
            console.log("Sending Backend request");
            let res=await this.getAccountById(JSON.stringify(sendObj));
            console.log(res);
            this.globals.AccountId=res["AccountId"];
            console.log(this.globals.AccountId);
            localStorage.setItem('AccountDetails', JSON.stringify(res));                
          }
      }          
  }

    async getAccountById(sendObject: string) { // : Observable<string> {
        console.log("Backend request");
        return await this.http.post<string>(this.AccountUrl + 'GetAccountById',
              sendObject, this.httpOptions)
            .pipe(
                retry(3) // retry a failed request up to 3 times
        ).toPromise();
}

我正在访问如下方法：

@Component({
  selector: 'app-home-layout',
  templateUrl: './home-layout.component.html',
  styleUrls: ['./home-layout.component.css']
})
export class HomeLayoutComponent implements OnInit {

 constructor(private authService: MsalService, private accountService: AzureAccountService, private globals: Globals) { }

  ngOnInit(): void {
    console.log(JSON.stringify(this.authService.getAccount()));
    this.setAccount();
    console.log("HomeLayout " + this.globals.AccountId);
  }

  async setAccount() {
    await this.accountService.setAccount();
  }
}

Answer 1

this.setAccount（）返回您没有等待的承诺。由于ngOnInit（）不是异步函数，因此您需要使用.then（）

Answer 2

Jason是正确的方式，您可以这样声明ngOnInit：

 async ngOnInit() {
    console.log(JSON.stringify(this.authService.getAccount()));
    await this.setAccount();
    console.log("HomeLayout " + this.globals.AccountId);
  }

角异步等待服务不起作用

2 个答案: