Question

编译代码时遇到此错误：

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

@Injectable()
export class TaskService {
  constructor(private http: HttpClient) {
  }

  getTasks() {
    return this.http.get('/api/tasks');
  }
}

src / app / tasks / task.service.ts（4,1）中的错误：错误TS1238：当作为表达式调用时，无法解析类装饰器的签名。

我不确定它出错的地方...... 4,1是Injectable之前的@符号。

Answer 1

尝试添加return类型getTasks(): Observable<any>。你正确地注射了HttpClientModule吗？

import { HttpClientModule } from '@angular/common/http';

@NgModule({
  imports: [
    BrowserModule,
    // Include it under 'imports' in your application module
    // after BrowserModule.
    HttpClientModule,
  ],
})

@Injectable标签Angular 5的TS错误

1 个答案: