Question

我正在尝试进行登录/创建帐户屏幕，但是我无法使异步程序正常运行。 Await无法正常工作，我的控制台在调用authToken后立即打印未定义的内容，然后打印“关于调用saveUserToken的信息”。

点击“创建帐户”按钮后，我称呼它。

async createUser() { 
        if ((this.state.email != "" && this.state.fname != "" && this.state.lname != "" && this.state.password != "" && this.state.confirmPassword != "")) {
            if (this.state.password == this.state.confirmPassword) {

                const authToken = await QueryHandler.createUser(this.state.email, this.state.password, this.state.fname, this.state.lname);
                console.log(authToken);

                console.log('About to call saveUserToken');
                const storeToken = await SecureDataStorage.saveUserToken(authToken);
                console.log(storeToken);

                ToastHandler.displayNormalMessage('Stored Token');
                const t = await SecureDataStorage.getUserToken();
                console.log('Got from SecureStorage:' + t)
                if(r) {
                    //Succesful result...
                    ToastHandler.displayNormalMessage('Account Created!');
                } else {
                    //Error...
                    ToastHandler.displayErrorMessage('Could not Create Account');
                }

                //Then navigate to login screen...

            } else {
                ToastHandler.displayErrorMessage('Passwords do not Match')
            }
        } else {
            ToastHandler.displayErrorMessage('Please Fill in all Fields');
        }
    }

This is my create user method.

static createUser(e, p, f, l) {
    result = '';
    axios.post((GRAPHQL_END_POINT), {
      query: print(Queries.CREATE_USER),
      variables: {
        firstName: f,
        lastName: l,
        email: e,
        password: p
      }
    })
      .then(res => {
        this.result = res.data.data.createUser.jwt;
        console.log(this.result);
        return true;
        // console.log(this.result);
      })
      .catch(err => {
        console.log(err)
        return false;
      })
      // return this.result;
  }

Answer 1

问题可能出在Gmodel.find({data.data_type: "event"}, callbackFunction)。如果它是异步的，请确保它在返回结果之前等待结果。

Answer 2

您应该尝试使createUser异步，以免将诺言与异步语法混淆。

    async createUser(e, p, f, l) {
    const res = await axios.post((GRAPHQL_END_POINT), {
      query: print(Queries.CREATE_USER),
      variables: {
        firstName: f,
        lastName: l,
        email: e,
        password: p
      }
    })
    console.log('res', res)
    return res.data.data.createUser.jwt;
  }

无法同步并等待正常工作

2 个答案: