Question

使用res.json()时，我尝试打印任务，使用res.tasks时，我什么也没得到。我遇到另一个错误，仅显示新错误，不显示旧错误，并且如果重新加载页面，那么新错误也会被删除。

task.ts

....

   loadTasks(): Promise<Task[]> {
   const url = `${this.tasksUrl}?access_token=${localStorage.getItem('token')}`;
   return this.http.get(url)
     .toPromise()
     .then(res => res.tasks as Task[]) // res.json()
     .catch(error => this.handleError(error, 'Could not load tasks!'));
}

....

错误终端：

ERROR in src/app/services/task.ts(30,24): error TS2339: Property 'tasks' does not exist on type 'Response'.

错误控制台浏览器：

ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'constructor' of undefined
TypeError: Cannot read property 'constructor' of undefined
at FilterByFieldPipe.push../src/app/pipes/filter-by-field.ts.FilterByFieldPipe.transform (filter-by-field.ts:10)

和filter-by-field.ts

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'filterByField',
  pure: false
})

export class FilterByFieldPipe implements PipeTransform {
  transform(items, key, value) {
    if (items.constructor === Array) {
      return items.filter((item) => item[key] === value);
    }
  }
}

角度错误，TS2339：类型“响应”上不存在属性“任务”

0 个答案: