Question

我使用离子服务测试时，有一段代码出现问题。我无法弄清楚 npm 更新后出了什么问题。

在终端上显示，
     src / app / pages / posts / posts.ts（30,27）中的
[ng]错误：错误TS2554：   预期有1个参数，但有0个。

希望有人可以指导我。预先感谢。

import { Component,OnInit,ViewEncapsulation } from '@angular/core';
import { LoadingController,NavController,ModalController } from '@ionic/angular';
import { Router } from '@angular/router';
import { WordPressRestapiService, Post } from '../../providers/wordpress-service';
/*
  Generated class for the Posts page.

  See http://ionicframework.com/docs/v2/components/#navigation for more info on
  Ionic pages and navigation.
*/
@Component({
  selector: 'page-posts',
  templateUrl: 'posts.html',
  styleUrls: ['posts.scss'],
  encapsulation: ViewEncapsulation.None
})

export class PostsPage {
  categoryId: number;
  private posts : Post[] = [];

  constructor(
      public loadingController: LoadingController,
      private wordpressService: WordPressRestapiService,
      public navCtrl: NavController,
      public router: Router,
      public modalView: ModalController) { }

  async ngOnInit() {
    const loading = await this.loadingController.create();
    await loading.present();

    this.loadPosts().subscribe(res => {
      this.posts = [...this.posts, ...res];
      loading.dismiss();
    });
  }

  loadPosts() {
    return this.wordpressService.getRecentPosts(this.categoryId);
  }


  openPost(postId) {
  this.router.navigateByUrl('/singlepost/' + postId);
  this.modalView.dismiss();
  }

}
import { Component,OnInit,ViewEncapsulation } from '@angular/core';
import { LoadingController,NavController,ModalController } from '@ionic/angular';
import { Router } from '@angular/router';
import { WordPressRestapiService, Post } from '../../providers/wordpress-service';
/*
  Generated class for the Posts page.

  See http://ionicframework.com/docs/v2/components/#navigation for more info on
  Ionic pages and navigation.
*/
@Component({
  selector: 'page-posts',
  templateUrl: 'posts.html',
  styleUrls: ['posts.scss'],
  encapsulation: ViewEncapsulation.None
})

export class PostsPage {
  categoryId: number;
  private posts : Post[] = [];

  constructor(
      public loadingController: LoadingController,
      private wordpressService: WordPressRestapiService,
      public navCtrl: NavController,
      public router: Router,
      public modalView: ModalController) { }

  async ngOnInit() {
    const loading = await this.loadingController.create();
    await loading.present();

    this.loadPosts().subscribe(res => {
      this.posts = [...this.posts, ...res];
      loading.dismiss();
    });
  }

  loadPosts() {
    return this.wordpressService.getRecentPosts(this.categoryId);
  }


  openPost(postId) {
  this.router.navigateByUrl('/singlepost/' + postId);
  this.modalView.dismiss();
  }

}

Answer 1

在您的代码中

const loading = await this.loadingController.create();

需要类似

的参数

create(options?: LoadingOptions | undefined) => Promise<HTMLIonLoadingElement>。

但是您传递了0个参数。请传递参数它将解决。

Follow this document获取完整说明。

Ionic4错误TS2554：预期有1个参数，但得到0

1 个答案: