错误 TS2554：需要 1 个参数，但得到 0。Angular6

Question

我有这个问题，我的应用程序工作正常，但此错误显示在 IDE 中。

员工.service.ts：

import { Injectable } from '@angular/core';
@Injectable({
  providedIn: 'root'
})
export class EmployeeService {
getEmployee(){
  return [
    {"id":1,"name":"Micheal","age":21},
    {"id":2,"name":"Jackson","age":22},
    {"id":3,"name":"Hales","age":23},
    {"id":4,"name":"Moz","age":25}
  ];
}
  constructor() { }
}

我的employeeDetail.ts 文件是这样的：

import { Component, OnInit } from '@angular/core';
import { EmployeeService } from '../services/employee.service';

@Component({
  selector: 'employee-detail',
  templateUrl: './employee-detail.component.html',
  styleUrls: ['./employee-detail.component.css']
})
export class EmployeeDetailComponent implements OnInit {

  public employees = [];
  constructor(private _employeeService : EmployeeService) {

   }

  ngOnInit() {
    this.employees = this._employeeService.getEmployee();
  }

}

这是 Employee-list.ts

import { Component, OnInit } from '@angular/core';
import {HttpClientModule} from '@angular/common/http';
import { EmployeeService } from '../services/employee.service';

@Component({
  selector: 'employee-list',
  templateUrl: './employee-list.component.html',
  styleUrls: ['./employee-list.component.css']
})
export class EmployeeListComponent implements OnInit {

  public employees = []



  constructor(private _employeeService : EmployeeService) { 


  }

  ngOnInit() {
    this.employees = this._employeeService.getEmployee();
  }

}

我怎么解决这个问题？实际问题是什么？因为我是 angular6 的新手，所以我无法弄清楚错误，请解释一下。谢谢你。

Answer 1

我没有看到您的代码有任何问题，因为我认为您应该停止应用程序Ctrl + C

然后做ng serve

无论如何，原因是，您的 getEmployee 方法仍然需要传递一个参数，只需确保您的代码保存在服务部分即可。