JSON 中的意外标记 u 在 <Jasmine> 的位置 0

Question

我有这个错误 'SyntaxError: Unexpected token u in JSON at position 0'，模拟 cookieService 的最佳方法是什么？

我的规范文件：

import { CUSTOM_ELEMENTS_SCHEMA, NO_ERRORS_SCHEMA } from "@angular/core";
import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
import { ComponentFixture, TestBed } from "@angular/core/testing";
import { FilterComponent } from "./filter.component";
import { RouterTestingModule } from '@angular/router/testing';
import { CookieModule, CookieService } from 'ngx-cookie';
import { Api } from '../../services/api.service';

describe('filter Component', () => {
  let component: FilterComponent;
  let fixture: ComponentFixture<FilterComponent>;
  let httpMock: HttpTestingController;
  let cookieService: CookieService;

  beforeEach(() => {
    TestBed.configureTestingModule({
        imports: [
            HttpClientTestingModule,
            RouterTestingModule,
            CookieModule.forRoot()
        ],
        declarations: [
            FilterComponent,
        ],
        providers: [
          Api,
          CookieService,
        ],
        schemas: [CUSTOM_ELEMENTS_SCHEMA, NO_ERRORS_SCHEMA]
    }).compileComponents();
  });

  beforeEach(() => {
    fixture = TestBed.createComponent(FilterComponent);
    component = fixture.componentInstance;
    service = TestBed.inject(Api);
    httpMock = TestBed.inject(HttpTestingController);
    cookieService = TestBed.inject(CookieService);
    cookieService.put('user', user.username);
    fixture.detectChanges();
  });

  it('should create', () => {
    expect(component).toBeTruthy();
  });

});

我的打字稿文件（构造函数）在这段代码中我调用函数cookie.get:

constructor(
        private api: Api,
        private cookie: CookieService,
    ) {
        this.user = JSON.parse(this.cookie.get('user'));
    }

Answer 1

解决方案为了解决这个问题，只需检查您尝试解析的字符串是否为 empty/null。如果不是 empty/null 你可以解析那个字符串。

if (yourValue != null) {
   output = JSON.parse(yourValue);
}

JSON 中的意外标记 u 在 <Jasmine> 的位置 0

Unexpected token u in JSON at position 0 at <Jasmine>

angular

typescript

karma-jasmine