创建新日期时，对象Date（）错误

乔尼别科夫

我正在开发新的Angular项目，其中包含有关电影的信息。创建新的不同日期时，我的movie.service.ts中有一个。

这是我的错误

ERROR TypeError: Cannot read property 'year' of undefined
    at new MovieService (movie.service.ts:17)
    at core.js:1461
    at _callFactory (core.js:8223)
    at _createProviderInstance (core.js:8181)
    at resolveNgModuleDep (core.js:8156)
    at NgModuleRef_.push../node_modules/@angular/core/fesm5/core.js.NgModuleRef_.get (core.js:8849)
    at resolveDep (core.js:9214)
    at createClass (core.js:9086)
    at createDirectiveInstance (core.js:8971)
    at createViewNodes (core.js:10191)

我想在过去的几个月里在剧院放映最近的电影。这是我的src代码

import { Injectable } from '@angular/core';
import { Jsonp } from "@angular/http";
import { HttpClient } from "@angular/common/http";

import {map} from 'rxjs/operators';
import { getLocaleDayNames } from '../../node_modules/@angular/common';

@Injectable({
  providedIn: 'root'
})
export class MovieService {
  date = new Date();
  today = {
    day: this.date.getDate(),
    month: this.date.getMonth(),
    year: this.date.getFullYear(),
    now: `${this.today.year}-${this.today.month}-${this.today.day}`,
    then: `${this.today.year}-${this.today.month - 1}-${this.today.day}`
  };


  apiKey: string = '9e2ecb8b71753c6759e1c9f2cb4f961a';

  constructor(private __jsonp: Jsonp) {
    console.log(`${this.today.now} and ${this.today.then}`);
  }

  getPopular(){
    this.__jsonp.get('https://api.themoviedb.org/3/discover/movie?callback=JSONP_CALLBACK&sort_by=popularity.desc')
      .pipe(map(res => res.json()));  
  }

  getInTheatres(){
    this.__jsonp.get('https://api.themoviedb.org/3//discover/movie?primary_release_date.gte=2014-09-15&primary_release_date.lte=2014-10-22')
  }
}

dAxx_

您试图在创建变量之前初始化变量。实现它的最简单方法是在构造函数中执行。像这样的东西：

  today;
  constructor() {
    const date = new Date();
    const dmy = {
      day: date.getDate(),
      month: date.getMonth(),
      year: date.getFullYear(),
    }
    this.today = {
      day: `${dmy.day}`,
      month: `${dmy.month}`,
      year: `${dmy.year}`,
      now: `${dmy.year}-${dmy.month}-${dmy.day}`,
      then: `${dmy.year}-${dmy.month - 1}-${dmy.day}`
    };
    console.log(this.today)
  }

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