typescript - 'loading' 类型不存在属性 'SignupPage' (TypeScript)

Question

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我是 MEAN 堆栈的新手，并且仍在尝试了解它的基础知识。

我正在尝试进行简单的身份验证。这是代码:

import { Component } from '@angular/core';
import { NavController, LoadingController } from 'ionic-angular';
import { Auth } from '../../providers/auth';
import { HomePage } from '../home/home';

@Component({
  selector: 'signup-page',
  templateUrl: 'signup-page.html'
})
export class SignupPage {

  role: string;
  email: string;
  password: string;

  constructor(public navCtrl: NavController, public authService: Auth, public loadingCtrl: LoadingController) {

  }

  register(){

    this.showLoader();

    let details = {
        email: this.email,
        password: this.password,
        role: this.role
    };

    this.authService.createAccount(details).then((result) => {
      this.loading.dismiss();
      console.log(result);
      this.navCtrl.setRoot(HomePage);
    }, (err) => {
        this.loading.dismiss();
    });

  }

  showLoader(){

    this.loading = this.loadingCtrl.create({
      content: 'Authenticating...'
    });

    this.loading.present();

  }

}

这是我得到的错误:

[12:43:17]  typescript: src/pages/signup-page/signup-page.ts, line: 31 
            Property 'loading' does not exist on type 'SignupPage'. 

      L30:  this.authService.createAccount(details).then((result) => {
      L31:    this.loading.dismiss();
      L32:    console.log(result);

[12:43:17]  typescript: src/pages/signup-page/signup-page.ts, line: 35 
            Property 'loading' does not exist on type 'SignupPage'. 

      L34:  }, (err) => {
      L35:      this.loading.dismiss();
      L36:  });

[12:43:17]  typescript: src/pages/signup-page/signup-page.ts, line: 42 
            Property 'loading' does not exist on type 'SignupPage'. 

      L42:  this.loading = this.loadingCtrl.create({
      L43:    content: 'Authenticating...'

[12:43:17]  typescript: src/pages/signup-page/signup-page.ts, line: 46 
            Property 'loading' does not exist on type 'SignupPage'. 

      L46:  this.loading.present();

[12:43:17]  transpile failed 

任何人都可以澄清我缺少什么以及我应该学习什么才能继续我的项目？

Answer 1

试试这个...

export class SignupPage {

  role: string;
  email: string;
  password: string;
  loading: any; 

  constructor(public navCtrl: NavController, public authService: Auth, public loadingCtrl: LoadingController) {

  }
....
}